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Struts2 framework 04 struts and spring integration

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Jul 09, 2017 pm 06:12 PM

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Table of contents

　1 Similarities and differences between servlet and filter

　2 Character encoding in memory

　3 Characteristics of gbk and utf-8

　4 Integration of struts and spring

　5 Integration steps of struts and spring

　6 The use of springIOC in action classes

　7 Annotation Review

1 Similarities and differences between servlet and filter

　1.1 Similarities

　Filter can be used instead of servlet, but some functions in filter can not be implemented by servlet, while all functions of servlet can be realized by filter

　1.2 Differences

　1.2.1 Conceptually

　Servlet is a program that runs on the server side and dynamically generates web pages

　　 Filter is a piece of code that can be reused . cannot generate requests and responses, but can handle responses and requests accordingly

　1.2.2 Life cycle

　 Servlet uses the constructor to instantiate the servlet when the web server starts or the web server receives the first request, and then calls the init method for initialization, and every subsequent request Will call the doGet or doPost method for processing; when closing the server, call the destroy method to destroy the instance

　　 Filter uses the constructor to instantiate filter when the web server starts, and then calls the init method to initialize, and every subsequent request calls the doFilter method Process and when closing the server, call the destroy methodDestroyinstance

　1.2.3 Different types

　Servlet is a class, filter is an interface

　1.3 Programming implementation of servlet and filter　

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> cn.xiangxu;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.IOException;
</span><span style="color: #008080"> 4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.PrintWriter;
</span><span style="color: #008080"> 5</span> 
<span style="color: #008080"> 6</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.ServletException;
</span><span style="color: #008080"> 7</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.http.HttpServlet;
</span><span style="color: #008080"> 8</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.http.HttpServletRequest;
</span><span style="color: #008080"> 9</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.http.HttpServletResponse;
</span><span style="color: #008080">10</span> 
<span style="color: #008080">11</span> <span style="color: #008000">/**</span>
<span style="color: #008080">12</span> <span style="color: #008000"> * Servlet implementation class DemoServlet
</span><span style="color: #008080">13</span>  <span style="color: #008000">*/</span>
<span style="color: #008080">14</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> DemoServlet <span style="color: #0000ff">extends</span><span style="color: #000000"> HttpServlet {
</span><span style="color: #008080">15</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">final</span> <span style="color: #0000ff">long</span> serialVersionUID = 1L<span style="color: #000000">;
</span><span style="color: #008080">16</span>     
<span style="color: #008080">17</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">18</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> HttpServlet#HttpServlet()
</span><span style="color: #008080">19</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">20</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> DemoServlet() {
</span><span style="color: #008080">21</span>         <span style="color: #0000ff">super</span><span style="color: #000000">();
</span><span style="color: #008080">22</span>         System.out.println("01 利用构造器实例化"<span style="color: #000000">);
</span><span style="color: #008080">23</span> <span style="color: #000000">    }
</span><span style="color: #008080">24</span>     
<span style="color: #008080">25</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">26</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span> init() <span style="color: #0000ff">throws</span><span style="color: #000000"> ServletException {
</span><span style="color: #008080">27</span>         <span style="color: #0000ff">super</span><span style="color: #000000">.init();
</span><span style="color: #008080">28</span>         System.out.println("02 利用init方法初始化"<span style="color: #000000">);
</span><span style="color: #008080">29</span> <span style="color: #000000">    }
</span><span style="color: #008080">30</span> 
<span style="color: #008080">31</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">32</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
</span><span style="color: #008080">33</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">34</span>     <span style="color: #0000ff">protected</span> <span style="color: #0000ff">void</span> doGet(HttpServletRequest request, HttpServletResponse response) <span style="color: #0000ff">throws</span><span style="color: #000000"> ServletException, IOException {
</span><span style="color: #008080">35</span>         System.out.println("03 调用处理方法"<span style="color: #000000">);
</span><span style="color: #008080">36</span>         
<span style="color: #008080">37</span>         response.setContentType("text/html;charset:utf-8"); <span style="color: #008000">//</span><span style="color: #008000"> 设置消息头部分信息</span>
<span style="color: #008080">38</span>         response.setCharacterEncoding("utf-8"<span style="color: #000000">);
</span><span style="color: #008080">39</span>         
<span style="color: #008080">40</span>         PrintWriter out =<span style="color: #000000"> response.getWriter();
</span><span style="color: #008080">41</span>         out.println("hello servlet"<span style="color: #000000">);
</span><span style="color: #008080">42</span> <span style="color: #000000">        out.close();
</span><span style="color: #008080">43</span> <span style="color: #000000">    } 
</span><span style="color: #008080">44</span>     
<span style="color: #008080">45</span> <span style="color: #000000">    @Override
</span><span style="color: #008080">46</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> destroy() {
</span><span style="color: #008080">47</span>         <span style="color: #0000ff">super</span><span style="color: #000000">.destroy();
</span><span style="color: #008080">48</span>         System.out.println("04 利用destroy方法销毁"<span style="color: #000000">);
</span><span style="color: #008080">49</span> <span style="color: #000000">    }
</span><span style="color: #008080">50</span> 
<span style="color: #008080">51</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">52</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
</span><span style="color: #008080">53</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">54</span>     <span style="color: #0000ff">protected</span> <span style="color: #0000ff">void</span> doPost(HttpServletRequest request, HttpServletResponse response) <span style="color: #0000ff">throws</span><span style="color: #000000"> ServletException, IOException {
</span><span style="color: #008080">55</span>         <span style="color: #008000">//</span><span style="color: #008000"> TODO Auto-generated method stub</span>
<span style="color: #008080">56</span> <span style="color: #000000">        doGet(request, response);
</span><span style="color: #008080">57</span> <span style="color: #000000">    }
</span><span style="color: #008080">58</span> 
<span style="color: #008080">59</span> }

DemoServlet

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> cn.xiangxu;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.IOException;
</span><span style="color: #008080"> 4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.PrintWriter;
</span><span style="color: #008080"> 5</span> 
<span style="color: #008080"> 6</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.Filter;
</span><span style="color: #008080"> 7</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.FilterChain;
</span><span style="color: #008080"> 8</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.FilterConfig;
</span><span style="color: #008080"> 9</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.ServletException;
</span><span style="color: #008080">10</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.ServletRequest;
</span><span style="color: #008080">11</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.ServletResponse;
</span><span style="color: #008080">12</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.servlet.http.HttpServletResponse;
</span><span style="color: #008080">13</span> 
<span style="color: #008080">14</span> <span style="color: #008000">/**</span>
<span style="color: #008080">15</span> <span style="color: #008000"> * Servlet Filter implementation class DemoFilter
</span><span style="color: #008080">16</span>  <span style="color: #008000">*/</span>
<span style="color: #008080">17</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span> DemoFilter <span style="color: #0000ff">implements</span><span style="color: #000000"> Filter {
</span><span style="color: #008080">18</span> 
<span style="color: #008080">19</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">20</span> <span style="color: #008000">     * Default constructor. 
</span><span style="color: #008080">21</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">22</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> DemoFilter() {
</span><span style="color: #008080">23</span>         System.out.println("01 利用构造器实例化"<span style="color: #000000">);
</span><span style="color: #008080">24</span> <span style="color: #000000">    }
</span><span style="color: #008080">25</span>     
<span style="color: #008080">26</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">27</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> Filter#init(FilterConfig)
</span><span style="color: #008080">28</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">29</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span> init(FilterConfig fConfig) <span style="color: #0000ff">throws</span><span style="color: #000000"> ServletException {
</span><span style="color: #008080">30</span>         System.out.println("02 利用init方法初始化"<span style="color: #000000">);
</span><span style="color: #008080">31</span> <span style="color: #000000">    }
</span><span style="color: #008080">32</span>     
<span style="color: #008080">33</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">34</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
</span><span style="color: #008080">35</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">36</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span> doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) <span style="color: #0000ff">throws</span><span style="color: #000000"> IOException, ServletException {
</span><span style="color: #008080">37</span>         System.out.println("03 调用处理方法"<span style="color: #000000">);
</span><span style="color: #008080">38</span>         
<span style="color: #008080">39</span>         HttpServletResponse response =<span style="color: #000000"> (HttpServletResponse)resp;
</span><span style="color: #008080">40</span>         
<span style="color: #008080">41</span>         response.setContentType("text/html;charset:utf-8"<span style="color: #000000">);
</span><span style="color: #008080">42</span>         response.setCharacterEncoding("utf-8"<span style="color: #000000">);
</span><span style="color: #008080">43</span>         
<span style="color: #008080">44</span>         PrintWriter out =<span style="color: #000000"> response.getWriter();
</span><span style="color: #008080">45</span>         out.println("hello filter"<span style="color: #000000">);
</span><span style="color: #008080">46</span> <span style="color: #000000">        out.close();
</span><span style="color: #008080">47</span> <span style="color: #000000">    }
</span><span style="color: #008080">48</span>     
<span style="color: #008080">49</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">50</span> <span style="color: #008000">     * </span><span style="color: #808080">@see</span><span style="color: #008000"> Filter#destroy()
</span><span style="color: #008080">51</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">52</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> destroy() {
</span><span style="color: #008080">53</span>         System.out.println("04 利用destroy方法销毁"<span style="color: #000000">);
</span><span style="color: #008080">54</span> <span style="color: #000000">    }
</span><span style="color: #008080">55</span>     
<span style="color: #008080">56</span> }

DemoFilter

<span style="color: #008080"> 1</span> <span style="color: #0000ff"></span><span style="color: #ff00ff">xml version="1.0" encoding="UTF-8"</span><span style="color: #0000ff">?></span>
<span style="color: #008080"> 2</span> <span style="color: #0000ff"><span style="color: #800000">web-app </span><span style="color: #ff0000">xmlns:xsi</span><span style="color: #0000ff">="http://www.w3.org/2001/XMLSchema-instance"</span><span style="color: #ff0000"> xmlns</span><span style="color: #0000ff">="http://java.sun.com/xml/ns/javaee"</span><span style="color: #ff0000"> xsi:schemaLocation</span><span style="color: #0000ff">="http://java.sun.com/xml/ns/javaee "</span><span style="color: #ff0000"> id</span><span style="color: #0000ff">="WebApp_ID"</span><span style="color: #ff0000"> version</span><span style="color: #0000ff">="2.5"</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 3</span>   <span style="color: #0000ff"><span style="color: #800000">display-name</span><span style="color: #0000ff">></span>servletVsFilter<span style="color: #0000ff"></span><span style="color: #800000">display-name</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 4</span>   <span style="color: #0000ff"><span style="color: #800000">welcome-file-list</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>index.html<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>index.htm<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 7</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>index.jsp<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 8</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>default.html<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 9</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>default.htm<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span>     <span style="color: #0000ff"><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>default.jsp<span style="color: #0000ff"></span><span style="color: #800000">welcome-file</span><span style="color: #0000ff">></span>
<span style="color: #008080">11</span>   <span style="color: #0000ff"></span><span style="color: #800000">welcome-file-list</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span>   <span style="color: #0000ff"><span style="color: #800000">servlet</span><span style="color: #0000ff">></span>
<span style="color: #008080">13</span>     <span style="color: #0000ff"><span style="color: #800000">servlet-name</span><span style="color: #0000ff">></span>servlet<span style="color: #0000ff"></span><span style="color: #800000">servlet-name</span><span style="color: #0000ff">></span>
<span style="color: #008080">14</span>     <span style="color: #0000ff"><span style="color: #800000">servlet-class</span><span style="color: #0000ff">></span>cn.xiangxu.DemoServlet<span style="color: #0000ff"></span><span style="color: #800000">servlet-class</span><span style="color: #0000ff">></span>
<span style="color: #008080">15</span>   <span style="color: #0000ff"></span><span style="color: #800000">servlet</span><span style="color: #0000ff">></span>
<span style="color: #008080">16</span>   <span style="color: #0000ff"><span style="color: #800000">servlet-mapping</span><span style="color: #0000ff">></span>
<span style="color: #008080">17</span>     <span style="color: #0000ff"><span style="color: #800000">servlet-name</span><span style="color: #0000ff">></span>servlet<span style="color: #0000ff"></span><span style="color: #800000">servlet-name</span><span style="color: #0000ff">></span>
<span style="color: #008080">18</span>     <span style="color: #0000ff"><span style="color: #800000">url-pattern</span><span style="color: #0000ff">></span>/servlet.do<span style="color: #0000ff"></span><span style="color: #800000">url-pattern</span><span style="color: #0000ff">></span>
<span style="color: #008080">19</span>   <span style="color: #0000ff"></span><span style="color: #800000">servlet-mapping</span><span style="color: #0000ff">></span>
<span style="color: #008080">20</span>   
<span style="color: #008080">21</span>   <span style="color: #0000ff"><span style="color: #800000">filter</span><span style="color: #0000ff">></span>
<span style="color: #008080">22</span>     <span style="color: #0000ff"><span style="color: #800000">filter-name</span><span style="color: #0000ff">></span>filter<span style="color: #0000ff"></span><span style="color: #800000">filter-name</span><span style="color: #0000ff">></span>
<span style="color: #008080">23</span>     <span style="color: #0000ff"><span style="color: #800000">filter-class</span><span style="color: #0000ff">></span>cn.xiangxu.DemoFilter<span style="color: #0000ff"></span><span style="color: #800000">filter-class</span><span style="color: #0000ff">></span>
<span style="color: #008080">24</span>   <span style="color: #0000ff"></span><span style="color: #800000">filter</span><span style="color: #0000ff">></span>
<span style="color: #008080">25</span>   <span style="color: #0000ff"><span style="color: #800000">filter-mapping</span><span style="color: #0000ff">></span>
<span style="color: #008080">26</span>     <span style="color: #0000ff"><span style="color: #800000">filter-name</span><span style="color: #0000ff">></span>filter<span style="color: #0000ff"></span><span style="color: #800000">filter-name</span><span style="color: #0000ff">></span>
<span style="color: #008080">27</span>     <span style="color: #0000ff"><span style="color: #800000">url-pattern</span><span style="color: #0000ff">></span>/filter.do<span style="color: #0000ff"></span><span style="color: #800000">url-pattern</span><span style="color: #0000ff">></span>
<span style="color: #008080">28</span>   <span style="color: #0000ff"></span><span style="color: #800000">filter-mapping</span><span style="color: #0000ff">></span>
<span style="color: #008080">29</span> <span style="color: #0000ff"></span><span style="color: #800000">web-app</span><span style="color: #0000ff">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

web.xml

项目结构图

servlet效果图

filter效果图

2 为什么对内存中的字符进行编码

　　字符在服务器内存中是16位的char,网络传输的单位是8为的byte，我们必须对数据进行拆分才能够进行传输，拆分的过程我们叫做编码

3 描述一下GBK和UTF-8的特点

　　utf-8是国际化的最优编码方案，包括了所有的字符，中文占3字节
　　gbk是本土化的最优编码方案，包含的字符较少，中文占2字节

4 struts2 和 spring 整合

　　4.1 为什么要进行整合

　　　　使用spring框架管理组件，实现注入，简化代码

　　4.2 怎么整合

　　　　导包（struts2 - spring - plugin）

　　　　配置文件（web.xml spring-struts.xml）

　　　　struts.xml配置文件

5 利用 struts + spring 实现 hello world 案例

　　5.1 导包

　　　　struts2核心包、struts和spring的整合插件包

<span style="color: #008080"> 1</span> <span style="color: #0000ff"><span style="color: #800000">project </span><span style="color: #ff0000">xmlns</span><span style="color: #0000ff">="http://maven.apache.org/POM/4.0.0"</span><span style="color: #ff0000"> xmlns:xsi</span><span style="color: #0000ff">="http://www.w3.org/2001/XMLSchema-instance"</span><span style="color: #ff0000"> xsi:schemaLocation</span><span style="color: #0000ff">="http://maven.apache.org/POM/4.0.0 "</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 2</span>   <span style="color: #0000ff"><span style="color: #800000">modelVersion</span><span style="color: #0000ff">></span>4.0.0<span style="color: #0000ff"></span><span style="color: #800000">modelVersion</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 3</span>   <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>cn.xiangxu<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 4</span>   <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>ssh02<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span>   <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>0.0.1-SNAPSHOT<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span>   <span style="color: #0000ff"><span style="color: #800000">packaging</span><span style="color: #0000ff">></span>war<span style="color: #0000ff"></span><span style="color: #800000">packaging</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 7</span>   <span style="color: #0000ff"><span style="color: #800000">dependencies</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 8</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 9</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>org.apache.struts<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>struts2-core<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">11</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>2.3.8<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">13</span>       <span style="color: #0000ff"><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">14</span>           <span style="color: #0000ff"><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>org.apache.struts<span style="color: #0000ff"></span><span style="color: #800000">groupId</span><span style="color: #0000ff">></span>
<span style="color: #008080">15</span>           <span style="color: #0000ff"><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>struts2-spring-plugin<span style="color: #0000ff"></span><span style="color: #800000">artifactId</span><span style="color: #0000ff">></span>
<span style="color: #008080">16</span>           <span style="color: #0000ff"><span style="color: #800000">version</span><span style="color: #0000ff">></span>2.3.8<span style="color: #0000ff"></span><span style="color: #800000">version</span><span style="color: #0000ff">></span>
<span style="color: #008080">17</span>       <span style="color: #0000ff"></span><span style="color: #800000">dependency</span><span style="color: #0000ff">></span>
<span style="color: #008080">18</span>   <span style="color: #0000ff"></span><span style="color: #800000">dependencies</span><span style="color: #0000ff">></span>
<span style="color: #008080">19</span> <span style="color: #0000ff"></span><span style="color: #800000">project</span><span style="color: #0000ff">></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

maven依赖文件代码

　　5.2 配置web.xml

<span style="color: #008080"> 1</span> <?xml version="1.0" encoding="UTF-8"?>
<span style="color: #008080"> 2</span> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee " version="2.5">
<span style="color: #008080"> 3</span>   <display-name>ssh02</display-name>
<span style="color: #008080"> 4</span>   <welcome-file-list>
<span style="color: #008080"> 5</span>     <welcome-file>index.html</welcome-file>
<span style="color: #008080"> 6</span>     <welcome-file>index.htm</welcome-file>
<span style="color: #008080"> 7</span>     <welcome-file>index.jsp</welcome-file>
<span style="color: #008080"> 8</span>     <welcome-file><span style="color: #0000ff">default</span>.html</welcome-file>
<span style="color: #008080"> 9</span>     <welcome-file><span style="color: #0000ff">default</span>.htm</welcome-file>
<span style="color: #008080">10</span>     <welcome-file><span style="color: #0000ff">default</span>.jsp</welcome-file>
<span style="color: #008080">11</span>   </welcome-file-list>
<span style="color: #008080">12</span>   
<span style="color: #008080">13</span>   <!--<span style="color: #000000"> 配置spring监听
</span><span style="color: #008080">14</span>               目的：容器启动时自动加载一下东西到缓存中 -->
<span style="color: #008080">15</span>   <listener>
<span style="color: #008080">16</span>       <listener- style="color: #0000ff">class>org.springframework.web.context.ContextLoaderListener</listener-><span style="color: #0000ff">class</span>>
<span style="color: #008080">17</span>   </listener>
<span style="color: #008080">18</span>   
<span style="color: #008080">19</span>   <!-- 配置Spring配置文件的位置 -->
<span style="color: #008080">20</span>   <context-param>
<span style="color: #008080">21</span>       <param-name>contextConfigLocation</param-name>
<span style="color: #008080">22</span>       <param-value>classpath:spring_*.xml</param-value>
<span style="color: #008080">23</span>   </context-param>
<span style="color: #008080">24</span>   
<span style="color: #008080">25</span>   <!-- 配置主控制器和过滤条件 -->
<span style="color: #008080">26</span>   <filter>
<span style="color: #008080">27</span>       <filter-name>mvc</filter-name>
<span style="color: #008080">28</span>       <filter- style="color: #0000ff">class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-><span style="color: #0000ff">class</span>>
<span style="color: #008080">29</span>   </filter>
<span style="color: #008080">30</span>   <filter-mapping>
<span style="color: #008080">31</span>       <filter-name>mvc</filter-name>
<span style="color: #008080">32</span>       <url-pattern><span style="color: #008000">/*</span><span style="color: #008000"></span></url-pattern>
<span style="color: #008080">33</span> <span style="color: #008000">  </span></filter-mapping>
<span style="color: #008080">34</span>   
<span style="color: #008080">35</span>   
<span style="color: #008080">36</span> <span style="color: #008000"></span></web-app>

web.xml配置文件源代码

　　　　5.2.1 配置spring监听

　　　　　　所需类的位置

　　　　5.2.2 配置Spring配置文件的位置

　　　　　　配置文件所处位置

　　　　5.2.3 配置主控制器和过滤条件

　　　　　　所需类的位置

　　5.3 配置spring_context.xml

　　　　只需要在里面配置组件扫描即可

<span style="color: #008080"> 1</span> <span style="color: #0000ff"></span><span style="color: #ff00ff">xml version="1.0" encoding="UTF-8"</span><span style="color: #0000ff">?></span>
<span style="color: #008080"> 2</span> <span style="color: #0000ff"><span style="color: #800000">beans </span><span style="color: #ff0000">xmlns</span><span style="color: #0000ff">="http://www.springframework.org/schema/beans"</span>
<span style="color: #008080"> 3</span> <span style="color: #ff0000">    xmlns:xsi</span><span style="color: #0000ff">="http://www.w3.org/2001/XMLSchema-instance"</span><span style="color: #ff0000"> xmlns:context</span><span style="color: #0000ff">="http://www.springframework.org/schema/context"</span>
<span style="color: #008080"> 4</span> <span style="color: #ff0000">    xmlns:jdbc</span><span style="color: #0000ff">="http://www.springframework.org/schema/jdbc"</span><span style="color: #ff0000"> xmlns:jee</span><span style="color: #0000ff">="http://www.springframework.org/schema/jee"</span>
<span style="color: #008080"> 5</span> <span style="color: #ff0000">    xmlns:tx</span><span style="color: #0000ff">="http://www.springframework.org/schema/tx"</span><span style="color: #ff0000"> xmlns:aop</span><span style="color: #0000ff">="http://www.springframework.org/schema/aop"</span>
<span style="color: #008080"> 6</span> <span style="color: #ff0000">    xmlns:mvc</span><span style="color: #0000ff">="http://www.springframework.org/schema/mvc"</span><span style="color: #ff0000"> xmlns:util</span><span style="color: #0000ff">="http://www.springframework.org/schema/util"</span>
<span style="color: #008080"> 7</span> <span style="color: #ff0000">    xmlns:jpa</span><span style="color: #0000ff">="http://www.springframework.org/schema/data/jpa"</span>
<span style="color: #008080"> 8</span> <span style="color: #ff0000">    xsi:schemaLocation</span><span style="color: #0000ff">="
</span><span style="color: #008080"> 9</span> <span style="color: #0000ff">         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
</span><span style="color: #008080">10</span> <span style="color: #0000ff">         http://www.springframework.org/schema/context/spring-context-3.0.xsd
</span><span style="color: #008080">11</span> <span style="color: #0000ff">         http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
</span><span style="color: #008080">12</span> <span style="color: #0000ff">         http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
</span><span style="color: #008080">13</span> <span style="color: #0000ff">         http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
</span><span style="color: #008080">14</span> <span style="color: #0000ff">         http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
</span><span style="color: #008080">15</span> <span style="color: #0000ff">         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
</span><span style="color: #008080">16</span> <span style="color: #0000ff">         http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
</span><span style="color: #008080">17</span> <span style="color: #0000ff">         http://www.springframework.org/schema/util/spring-util-3.0.xsd"</span><span style="color: #0000ff">></span>
<span style="color: #008080">18</span> 
<span style="color: #008080">19</span>     <span style="color: #008000"><!--</span><span style="color: #008000"> 配置组件扫描 </span><span style="color: #008000">--></span>
<span style="color: #008080">20</span>     <span style="color: #0000ff"><span style="color: #800000">context:component-scan </span><span style="color: #ff0000">base-package</span><span style="color: #0000ff">="cn.xiangxu"</span> <span style="color: #0000ff">/></span>
<span style="color: #008080">21</span>     
<span style="color: #008080">22</span> <span style="color: #0000ff"></span><span style="color: #800000">beans</span><span style="color: #0000ff">></span></span></span>

spring配置文件代码

　　5.4 配置struts.xml

<span style="color: #008080"> 1</span> <span style="color: #0000ff"></span><span style="color: #ff00ff">xml version="1.0" encoding="UTF-8"</span><span style="color: #0000ff">?></span>
<span style="color: #008080"> 2</span> <span style="color: #0000ff"><span style="color: #ff00ff">DOCTYPE struts PUBLIC
</span><span style="color: #008080"> 3</span> <span style="color: #ff00ff">    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
</span><span style="color: #008080"> 4</span> <span style="color: #ff00ff">    "http://struts.apache.org/dtds/struts-2.3.dtd"</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span> <span style="color: #0000ff"><span style="color: #800000">struts</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span> 
<span style="color: #008080"> 7</span>     <span style="color: #0000ff"><span style="color: #800000">package </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="test"</span><span style="color: #ff0000"> namespace</span><span style="color: #0000ff">="/test"</span><span style="color: #ff0000"> extends</span><span style="color: #0000ff">="struts-default"</span><span style="color: #0000ff">></span> <span style="color: #008000"><!--</span><span style="color: #008000"> namespace是配置访问路径，extends是配置继承默认struts文件 </span><span style="color: #008000">--></span>
<span style="color: #008080"> 8</span>         <span style="color: #0000ff"><span style="color: #800000">action </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="demo"</span><span style="color: #ff0000"> class</span><span style="color: #0000ff">="cn.xiangxu.TestAction"</span><span style="color: #0000ff">></span> <span style="color: #008000"><!--</span><span style="color: #008000"> name是配置访问网名，class是配置action类 </span><span style="color: #008000">--></span>
<span style="color: #008080"> 9</span>             <span style="color: #0000ff"><span style="color: #800000">result </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="success"</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span> <span style="color: #000000">                /WEB-INF/jsp/msg.jsp
</span><span style="color: #008080">11</span>             <span style="color: #0000ff"></span><span style="color: #800000">result</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span>         <span style="color: #0000ff"></span><span style="color: #800000">action</span><span style="color: #0000ff">></span>
<span style="color: #008080">13</span>     <span style="color: #0000ff"></span><span style="color: #800000">package</span><span style="color: #0000ff">></span>
<span style="color: #008080">14</span>     
<span style="color: #008080">15</span> <span style="color: #0000ff"></span><span style="color: #800000">struts</span><span style="color: #0000ff">></span></span></span></span></span></span>

struts配置文件

　　5.5 编写action类

<span style="color: #008080">1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> cn.xiangxu;
</span><span style="color: #008080">2</span> 
<span style="color: #008080">3</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span><span style="color: #000000"> TestAction {
</span><span style="color: #008080">4</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String execute() {
</span><span style="color: #008080">5</span>         System.out.println("struts整合spring"<span style="color: #000000">);
</span><span style="color: #008080">6</span>         <span style="color: #0000ff">return</span> "success"<span style="color: #000000">;
</span><span style="color: #008080">7</span> <span style="color: #000000">    }
</span><span style="color: #008080">8</span> }

action类代码

　　5.6 编写所需的JSP文件

<span style="color: #008080"> 1</span> <span style="color: #0000ff"><span style="color: #800000">%@ page </span><span style="color: #ff0000">language</span><span style="color: #0000ff">="java"</span><span style="color: #ff0000"> contentType</span><span style="color: #0000ff">="text/html; charset=utf-8"</span>
<span style="color: #008080"> 2</span> <span style="color: #ff0000">    pageEncoding</span><span style="color: #0000ff">="utf-8"</span><span style="color: #ff0000">%</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 3</span> <span style="color: #0000ff"><span style="color: #ff00ff">DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 4</span> <span style="color: #0000ff"><span style="color: #800000">html</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span> <span style="color: #0000ff"><span style="color: #800000">head</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span> <span style="color: #0000ff"><span style="color: #800000">meta </span><span style="color: #ff0000">http-equiv</span><span style="color: #0000ff">="Content-Type"</span><span style="color: #ff0000"> content</span><span style="color: #0000ff">="text/html; charset=utf-8"</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 7</span> <span style="color: #0000ff"><span style="color: #800000">title</span><span style="color: #0000ff">></span>test<span style="color: #0000ff"></span><span style="color: #800000">title</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 8</span> <span style="color: #0000ff"></span><span style="color: #800000">head</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 9</span> <span style="color: #0000ff"><span style="color: #800000">body</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span>     <span style="color: #0000ff"><span style="color: #800000">h2</span><span style="color: #0000ff">></span>恭喜你，struts整合spring成功！<span style="color: #0000ff"></span><span style="color: #800000">h2</span><span style="color: #0000ff">></span>
<span style="color: #008080">11</span> <span style="color: #0000ff"></span><span style="color: #800000">body</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span> <span style="color: #0000ff"></span><span style="color: #800000">html</span><span style="color: #0000ff">></span></span></span></span></span></span></span></span></span>

jsp文件代码

　　项目结构图

6 struts整合spring后就可以使用springIOC啦

　　例如：持久层的action类中通过依赖注入服务层的类，从而就可以使用服务层的相关属性和方法啦

　　6.1 案例改进所需的业务层类

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> cn.xiangxu.service;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.stereotype.Service;
</span><span style="color: #008080"> 4</span> 
<span style="color: #008080"> 5</span> <span style="color: #000000">@Service
</span><span style="color: #008080"> 6</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span><span style="color: #000000"> TestService {
</span><span style="color: #008080"> 7</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">void</span><span style="color: #000000"> test() {
</span><span style="color: #008080"> 8</span>         System.out.println("我是业务层的数据哟。"<span style="color: #000000">);
</span><span style="color: #008080"> 9</span> <span style="color: #000000">    }
</span><span style="color: #008080">10</span> }

增加的service类代码

　　6.2 案例改进一

　　　　在action类上添加@Controller注解，这样spring容器就会自动给其增加一个bean

　　　　在action类上添加@Scope("prototype")注解，这样就能让每一个请求都有一个action处理类，如果不写就是所有的请求公用一个action处理类（即：默认时使用单例模式）

　　　　在action类中依赖注入业务层，从而实现控制反转

<span style="color: #008080"> 1</span> <span style="color: #0000ff">package</span><span style="color: #000000"> cn.xiangxu.action;
</span><span style="color: #008080"> 2</span> 
<span style="color: #008080"> 3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> javax.annotation.Resource;
</span><span style="color: #008080"> 4</span> 
<span style="color: #008080"> 5</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.context.annotation.Scope;
</span><span style="color: #008080"> 6</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.springframework.stereotype.Controller;
</span><span style="color: #008080"> 7</span> 
<span style="color: #008080"> 8</span> <span style="color: #0000ff">import</span><span style="color: #000000"> cn.xiangxu.service.TestService;
</span><span style="color: #008080"> 9</span> 
<span style="color: #008080">10</span> <span style="color: #000000">@Controller
</span><span style="color: #008080">11</span> @Scope("prototype"<span style="color: #000000">)
</span><span style="color: #008080">12</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span><span style="color: #000000"> TestAction {
</span><span style="color: #008080">13</span>     
<span style="color: #008080">14</span>     @Resource(name="testService"<span style="color: #000000">)
</span><span style="color: #008080">15</span>     <span style="color: #0000ff">private</span><span style="color: #000000"> TestService testService;
</span><span style="color: #008080">16</span>     
<span style="color: #008080">17</span>     <span style="color: #0000ff">public</span><span style="color: #000000"> String execute() {
</span><span style="color: #008080">18</span>         System.out.println("struts整合spring"<span style="color: #000000">);
</span><span style="color: #008080">19</span> <span style="color: #000000">        testService.test();
</span><span style="color: #008080">20</span>         <span style="color: #0000ff">return</span> "success"<span style="color: #000000">;
</span><span style="color: #008080">21</span> <span style="color: #000000">    }
</span><span style="color: #008080">22</span> }

action类改进

　　6.3 案例改进二

　　　　struts中的action标签中的class属性值可以用相应bean的id代替

<span style="color: #008080"> 1</span> <span style="color: #0000ff"></span><span style="color: #ff00ff">xml version="1.0" encoding="UTF-8"</span><span style="color: #0000ff">?></span>
<span style="color: #008080"> 2</span> <span style="color: #0000ff"><span style="color: #ff00ff">DOCTYPE struts PUBLIC
</span><span style="color: #008080"> 3</span> <span style="color: #ff00ff">    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
</span><span style="color: #008080"> 4</span> <span style="color: #ff00ff">    "http://struts.apache.org/dtds/struts-2.3.dtd"</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 5</span> <span style="color: #0000ff"><span style="color: #800000">struts</span><span style="color: #0000ff">></span>
<span style="color: #008080"> 6</span> 
<span style="color: #008080"> 7</span>     <span style="color: #0000ff"><span style="color: #800000">package </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="test"</span><span style="color: #ff0000"> namespace</span><span style="color: #0000ff">="/test"</span><span style="color: #ff0000"> extends</span><span style="color: #0000ff">="struts-default"</span><span style="color: #0000ff">></span> <span style="color: #008000"><!--</span><span style="color: #008000"> namespace是配置访问路径，extends是配置继承默认struts文件 </span><span style="color: #008000">--></span>
<span style="color: #008080"> 8</span>         <span style="color: #0000ff"><span style="color: #800000">action </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="demo"</span><span style="color: #ff0000"> class</span><span style="color: #0000ff">="testAction"</span><span style="color: #0000ff">></span> <span style="color: #008000"><!--</span><span style="color: #008000"> name是配置访问网名，class是配置action类 </span><span style="color: #008000">--></span>
<span style="color: #008080"> 9</span>             <span style="color: #0000ff"><span style="color: #800000">result </span><span style="color: #ff0000">name</span><span style="color: #0000ff">="success"</span><span style="color: #0000ff">></span>
<span style="color: #008080">10</span> <span style="color: #000000">                /WEB-INF/jsp/msg.jsp
</span><span style="color: #008080">11</span>             <span style="color: #0000ff"></span><span style="color: #800000">result</span><span style="color: #0000ff">></span>
<span style="color: #008080">12</span>         <span style="color: #0000ff"></span><span style="color: #800000">action</span><span style="color: #0000ff">></span>
<span style="color: #008080">13</span>     <span style="color: #0000ff"></span><span style="color: #800000">package</span><span style="color: #0000ff">></span>
<span style="color: #008080">14</span>     
<span style="color: #008080">15</span> <span style="color: #0000ff"></span><span style="color: #800000">struts</span><span style="color: #0000ff">></span></span></span></span></span></span>

sturts配置文件代码改进

7 Annotation Review

　@Component@Controller@Service@Repository

@Resource@Scope

@Component Common tag (not recommended, novices can use it, [can be used during AOP programming])

Format 1: @Controller("specified id")

　　Format 2: @Controller In this way, the default id is used, that is: the value after the class name in lowercase
　@Controller acts on the control layer
　　@Service acts on the business layer
@Repository Acts on the persistence layer

@Scope To avoid thread safety issues, specify the value as "prototype", so that each request will correspond to an action processing class; if not written, it will be a singleton mode (i.e. : All requests correspond to an action processing class)

Format: @Scope("prototype")

　@Resource Declaration during dependency injection

Format: @Resource(name="dependency injection id")

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Struts2 framework 04 struts and spring integration

1 Similarities and differences between servlet and filter

1.1 Similarities

1.2 Differences

1.2.1 Conceptually

1.2.2 Life cycle

1.2.3 Different types

1.3 Programming implementation of servlet and filter

2 为什么对内存中的字符进行编码

3 描述一下GBK和UTF-8的特点

4 struts2 和 spring 整合

4.1 为什么要进行整合

4.2 怎么整合

5 利用 struts + spring 实现 hello world 案例

5.1 导包

5.2 配置web.xml

5.2.1 配置spring监听

5.2.2 配置Spring配置文件的位置

5.2.3 配置主控制器和过滤条件

5.3 配置spring_context.xml

5.4 配置struts.xml

5.5 编写action类

5.6 编写所需的JSP文件

6 struts整合spring后就可以使用springIOC啦

6.1 案例改进所需的业务层类

6.2 案例改进一

6.3 案例改进二

7 Annotation Review

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　1.1 Similarities

　1.2 Differences

　1.2.1 Conceptually

　1.2.2 Life cycle

　1.2.3 Different types

　1.3 Programming implementation of servlet and filter　

　　4.1 为什么要进行整合

　　4.2 怎么整合

　　5.1 导包

　　5.2 配置web.xml

　　　　5.2.1 配置spring监听

　　　　5.2.2 配置Spring配置文件的位置

　　　　5.2.3 配置主控制器和过滤条件

　　5.3 配置spring_context.xml

　　5.4 配置struts.xml

　　5.5 编写action类

　　5.6 编写所需的JSP文件

　　6.1 案例改进所需的业务层类

　　6.2 案例改进一

　　6.3 案例改进二