jQuery ajax requests struts action to implement asynchronous refresh example sharing

This article mainly introduces JQuery ajax to request struts action to achieve asynchronous refresh. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

This example is a small example using JQuery ajax and struts. In this example, two methods are used to convert the list in java Util into json format. The first one is to use The json-lib.jar jar package is used for conversion. The second method is to use goole's gson-2.1.jar for conversion. You can import the corresponding jar package as needed. Here, both jar packages are imported for testing. Now let’s get to the point

Step one:Import related jar packages. In this example, you need to import struts related jar packages. You can choose json-lib.jar or gson-2.1.jar at will. But you need to import both here, because for testing, both jar package conversion methods are used.

Step 2: Configure web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:xsi="http://www.php.cn/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 <display-name></display-name> 
 <!-- 声明Struts2的前端控制器 -->
 <filter>
 <filter-name>struts2</filter-name>
 <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 </filter>
 <filter-mapping>
 <filter-name>struts2</filter-name>
 <url-pattern>/*</url-pattern>
 </filter-mapping>
 
 <!-- 声明Spring的ContextListener，负责上下文一加载立即创建BeanFactory -->
 <context-param> <!-- 若applicationContext.xml没有放在WEB-INF下或者不叫这个名字，必需声明此参数 -->
 <param-name>contextConfigLocation</param-name>
 <param-value>classpath:applicationContext.xml</param-value> 
 </context-param>
</web-app>

Step 3: New struts.xml , jump to /WEB-INF/index.jsp under admin/ by default

<?xml version="1.0" encoding="UTF-8" ?>
<!-- <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> -->
<!DOCTYPE struts PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 "http://www.yxccc.com/news/">

<struts>

 <package name="bg" namespace="/" extends="struts-default">
 <default-action-ref name="index"/>
 <!-- =================基础跳转====================== -->
 <action name="index">
  <result>/WEB-INF/index.jsp</result>
 </action>
 </package>

</struts>

Step 4: Write the AjaxRequestAction.java file, do it here Two requests are made, one is to directly request a string, and the other is to request a set of data in array format, but the data must be converted into an array supported by JSON, as follows

package com.fengqi.action;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import org.apache.struts2.ServletActionContext;
import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 创建时间：2014-10-24，ajax请求的action样例
 */
public class AjaxRequestAction extends ActionSupport{
 private String sex;
 @Override
 public String execute() throws Exception {
 return super.execute();
 }
 
 /**
 * ajax请求，以json格式的字符串响应请求
 */
 public void ajaxString(){
 System.out.println(sex);
 //获取相应Response
 HttpServletResponse response = ServletActionContext.getResponse(); 
 //设置编码方式
 response.setCharacterEncoding("UTF-8"); 
 try {
  if(sex.equals("nan")){
  response.getWriter().write("我是男的");
  }else if(sex.equals("nv")){
  response.getWriter().write("我是女的");
  }else{
  response.getWriter().write("男女都不是");
  }
  //将数据写到页面中
 } catch (IOException e) {
  e.printStackTrace();
 }
 }
 
 /**
 * ajax请求，以list的形式响应请求，主要这里的list并不是Util的List，而是经过转换成指出json格式的List
 */
 public void ajaxList(){
 List<Object> list = new ArrayList<Object>();
 list.add("张三");
 list.add("李四");
 //第一种方法：利用json-lib包中的JSONArray将List转换成JSONArray各式。
 JSONArray jsonArray = JSONArray.fromObject(list);
 //第二周方法：利用goole的json包将List转换成Json对象。
 Gson gson = new Gson();
 String gsonList = gson.toJson(list);
 //获取相应Response
 HttpServletResponse response = ServletActionContext.getResponse(); 
 //设置编码方式
 response.setCharacterEncoding("UTF-8"); 
 try {
  //将数据写到页面中
  response.getWriter().println(jsonArray);
 } catch (IOException e) {
  e.printStackTrace();
 }
 }

 public String getSex() {
 return sex;
 }

 public void setSex(String sex) {
 this.sex = sex;
 }
 
}

Step 5:After updating the struts.xml file, configure the access path of AjaxRequestAction.java and add the following code

##

<package name="ajax" namespace="/ajax" extends="struts-default">
<!-- =================ajax请求跳转====================== -->
<action name="ajax_*" class="com.fengqi.action.AjaxRequestAction" method="ajax{1}">
</action>
</package>

The final complete file of struts.xml is

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 "http://www.yxccc.com">

<struts>

 <package name="bg" namespace="/admin" extends="struts-default">
 <default-action-ref name="index"/>
 <!-- =================基础跳转====================== -->
 <action name="index">
  <result>/WEB-INF/index.jsp</result>
 </action>
 </package>
 <package name="ajax" namespace="/ajax" extends="struts-default">
 <!-- =================ajax请求跳转====================== -->
 <action name="ajax_*" class="com.fengqi.action.AjaxRequestAction" method="ajax{1}">
 </action>
 </package>

</struts>

Step 6: Writing the index.jsp file, two requests are made here, one One is to directly request a string, and the other is to request a set of data in array format, but the data must be converted into an array supported by JSON, as follows

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

 <head>
  <base href="<%=basePath%>" rel="external nofollow" >
  
  <title>ajax异步刷新样例测试</title>
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">  
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
　　　　 <link href="http://www.yxccc.com/css/css.css" rel="stylesheet" type="text/css" />
 <script src="js/jquery-2.1.1.min.js"></script>
 <script type="text/javascript">
 $(document).ready(function() {
 $("#hh1").click(function(){
  $.ajax({
  url:"ajax/ajax_String",//请求url
  data:{sex:$("#txt1").val()},
  success:function(data){//请求返回的数据
   $("p").html(data);//将数据打印到页面的p中
  }
  });
 });
 $("#hh2").click(function() {
  $.ajax({
       url: "ajax/ajax_List",//请求url http://www.yxccc.com
       //cache: false,
       type: "POST", //请求头，这里是post
       datatype: &#39;json&#39;, //请求数据各式，这里是json格式
       success: function(data,status){
    data = $.parseJSON(data); //将字符串格式的数据转换成json对象
    //这里将option元素移除是考虑到如果在页面不刷新的情况下多次请求，会产生数据累加，不符合业务需求,因此需先删除在增加元素。
       $("option").remove(); 
       $("select").append("<option>请选择</option>");//在select元素下添加option子元素。
       $(data).each(function(i){ //遍历请求相应的data数据
          $("select").append("<option>"+data[i]+"</option>");
       })
       }
     });
   });
 });
 </script>
 
 </head>
 <body>
 <br>
  <h2 id="这里是ajax请求Demo-该实例是请求Struts中的action">这里是ajax请求Demo，该实例是请求Struts中的action</h2> <br>
  <button id="hh1">请求返回常规字符串</button>
  <button id="hh2">请求返回JSON格式的List</button><br><br>
  <p>这里是p元素</p><br>
  请选择性别:<select id="txt1" name="sex">
   <option>请选择</option>
   <option value="nan">男</option>
   <option value="nv">女</option>
  </select><br><br>
  
  <select>
  <option>select选择</option>
  </select>
  
 </body>
</html>

Such a simple ajax request has been completed.

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