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It is called the value stack, the data structure of shared data provided by Struts
Pass data from the controller to the browser
Store object information related to the request (session/application)
Request entry After reaching the server, a ValueStack object will be created in the memory; when the request processing is completed, the ValueStack object will be cleared
Using OGNL expression Expression acquisition
Use EL expression to obtain
Contents (stack structure) Use OGNL or EL to obtain data
Context (Map structure ) Use #key to obtain data
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 "> 2 <modelVersion>4.0.0</modelVersion> 3 <groupId>cn.xiangxu</groupId> 4 <artifactId>ssh03</artifactId> 5 <version>0.0.1-SNAPSHOT</version> 6 <packaging>war</packaging> 7 <dependencies> 8 <dependency> 9 <groupId>org.apache.struts</groupId>10 <artifactId>struts2-core</artifactId>11 <version>2.3.8</version>12 </dependency>13 <dependency>14 <groupId>org.apache.struts</groupId>15 <artifactId>struts2-spring-plugin</artifactId>16 <version>2.3.8</version>17 </dependency>18 <dependency>19 <groupId>org.apache.struts</groupId>20 <artifactId>struts2-json-plugin</artifactId>21 <version>2.3.8</version>22 </dependency>23 </dependencies>24 </project>
Configuring annotation scanning
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" 4 xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" 5 xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" 6 xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" 7 xmlns:jpa="http://www.springframework.org/schema/data/jpa" 8 xsi:schemaLocation=" 9 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd10 http://www.springframework.org/schema/context/spring-context-3.0.xsd11 http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd12 http://www.springframework.org/schema/jee/spring-jee-3.0.xsd13 http://www.springframework.org/schema/tx/spring-tx-3.0.xsd14 http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd15 http://www.springframework.org/schema/aop/spring-aop-3.0.xsd16 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd17 http://www.springframework.org/schema/util/spring-util-3.0.xsd">18 19 <!-- 配置组件扫描 -->20 <context:component-scan base-package="cn.xiangxu" />21 22 </beans>spring_context.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 3 <!DOCTYPE struts PUBLIC 4 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" 5 "http://struts.apache.org/dtds/struts-2.3.dtd"> 6 7 <struts> 8 9 <!-- 测试struts整合spring时用 -->10 <package name="test" namespace="/test" extends="json-default">11 <action name="demo">12 <result>13 /WEB-INF/jsp/msg.jsp14 </result>15 </action>16 </package>17 18 <package name="vs" namespace="/vs" extends="json-default">19 <action name="valueStack" class="valueStackAction" method="valueStaceMethod">20 <result name="success">21 /WEB-INF/jsp/valueStack.jsp22 </result>23 </action>24 </package>25 26 </struts>27 28
7.2.3 web.xml
Configure the spring configuration file location
Configure the main controller
1 <?xml version="1.0" encoding="UTF-8"?> 2 <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"> 3 <display-name>ssh03</display-name> 4 <welcome-file-list> 5 <welcome-file>index.html</welcome-file> 6 <welcome-file>index.htm</welcome-file> 7 <welcome-file>index.jsp</welcome-file> 8 <welcome-file>default.html</welcome-file> 9 <welcome-file>default.htm</welcome-file>10 <welcome-file>default.jsp</welcome-file>11 </welcome-file-list>12 13 <!-- 配置spring监听14 目的:容器启动时自动加载一些东西到缓存中 -->15 <listener>16 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>17 </listener>18 19 <!-- 配置Spring配置文件的位置 -->20 <context-param>21 <param-name>contextConfigLocation</param-name>22 <param-value>classpath:spring_*.xml</param-value>23 </context-param>24 25 <!-- 配置主控制器和过滤条件 -->26 <filter>27 <filter-name>mvc</filter-name>28 <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>29 </filter>30 <filter-mapping>31 <filter-name>mvc</filter-name>32 <url-pattern>/*</url-pattern>33 </filter-mapping>34 35 </web-app>
1 package cn.xiangxu.action; 2 3 import org.springframework.context.annotation.Scope; 4 import org.springframework.stereotype.Controller; 5 6 import com.opensymphony.xwork2.ActionContext; 7 import com.opensymphony.xwork2.util.ValueStack; 8 9 import cn.xiangxu.entity.Person;10 11 @Controller12 @Scope("prototype")13 public class ValueStackAction {14 15 private String message;16 17 public String valueStaceMethod() {18 System.out.println("跟valueStack相关的action类");19 20 message = "我是控制类中的属性message";21 22 // 利用工厂方法来获取session对象时就使用下面两行代码23 ActionContext context = ActionContext.getContext();24 context.getSession().put("loginName", "warrior"); // 向session中插入数据25 26 context.getSession().put("password", "123456"); // 向session中插入数据27 28 // 利用上下文对象来获取ValueStack对象29 ValueStack valueStack = context.getValueStack();30 31 Person person = new Person();32 person.setId("333");33 person.setName("fury");34 person.setMessage("hello fury");35 valueStack.push(person); // 将数据插入到对象栈中36 37 return "success";38 }39 40 public String getMessage() {41 return message;42 }43 44 public void setMessage(String message) {45 this.message = message;46 }47 48 }
1 package cn.xiangxu.entity; 2 3 import java.io.Serializable; 4 5 public class Person implements Serializable { 6 7 private static final long serialVersionUID = -7221161390673280278L; 8 private String id; 9 private String name;10 private String message;11 public Person() {12 super();13 // TODO Auto-generated constructor stub14 }15 public Person(String id, String name, String message) {16 super();17 this.id = id;18 this.name = name;19 this.message = message;20 }21 @Override22 public int hashCode() {23 final int prime = 31;24 int result = 1;25 result = prime * result + ((id == null) ? 0 : id.hashCode());26 return result;27 }28 @Override29 public boolean equals(Object obj) {30 if (this == obj)31 return true;32 if (obj == null)33 return false;34 if (getClass() != obj.getClass())35 return false;36 Person other = (Person) obj;37 if (id == null) {38 if (other.id != null)39 return false;40 } else if (!id.equals(other.id))41 return false;42 return true;43 }44 public String getId() {45 return id;46 }47 public void setId(String id) {48 this.id = id;49 }50 public String getName() {51 return name;52 }53 public void setName(String name) {54 this.name = name;55 }56 public String getMessage() {57 return message;58 }59 public void setMessage(String message) {60 this.message = message;61 }62 @Override63 public String toString() {64 return "Person [id=" + id + ", name=" + name + ", message=" + message + "]";65 }66 67 68 }
${变量名}
注意:为什么访问sesseion中的数据时需要在前面加 #session. 是因为....【自己百度去,或者参见本博客顶端的连接;三少能力有限,讲不清楚】
注意:在读取栈结构中的数据时是从栈顶开始读的,如果有两个变量的名字相同,那么读取到的只会是相对前面的那个变量的值
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 4 <!-- 引入struts2标签库 --> 5 <%@ taglib prefix="s" uri="/struts-tags" %> 6 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head>10 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">11 <title>Insert title here</title>12 </head>13 <body>14 <h2>跟valueStack有关的页面</h2>15 <hr /><hr />16 17 <h2>利用EL表达式从valuesStack中获取数据</h2>18 <h3>${message }</h3>19 <hr />20 <h3>${loginName }</h3>21 <hr />22 <h3>${password }</h3>23 <hr /><hr />24 25 <h2>利用OGNL表达式获取valueStack中的数据</h2>26 <h3><s:property value="message"/></h3>27 <hr />28 <h3><s:property value="#session.loginName"/></h3>29 <hr />30 <h3><s:property value="#session.password"/></h3>31 32 <hr /><hr />33 34 <s:debug></s:debug>35 </body>36 </html>
7.5 项目结构图
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