ajax+json+Struts2实现list传递

由于实习需要，需要通过ajax来获取后台的List集合里面的值。由于前面没有接触过，所以今天就来研究下了。

一、首先需要下载JSON依赖的jar包。它主要是依赖如下：

json-lib-2.2.2-jdk15

  ezmorph-1.0.4
  commons-logging-1.0.4
  commons-lang-2.4
  commons-collections-3.2.1

commons-beanutils

二、实例。

1、身份证错误信息Bean类(ErrorCondition.java)

/**
 *@Project: excel
 *@Author: chenssy
 *@Date: 2013-4-4
 *@Copyright: chenssy All rights reserved.
 */
public class ErrorCondition {
	private String name; // 姓名
	private String idCard; // 身份证
	private String status; // 错误状态
	private String message; // 错误信息

	ErrorCondition(String name,String idCard,String status,String message){
		this.name = name;
		this.idCard = idCard;
		this.status = status;
		this.message = message;
	}
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getIdCard() {
		return idCard;
	}

	public void setIdCard(String idCard) {
		this.idCard = idCard;
	}

	public String getStatus() {
		return status;
	}

	public void setStatus(String status) {
		this.status = status;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

}

2、JSP页面(index.jsp)

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
  <head>	
  	<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.7.2.js"></script>
  </head>
  
  <body>
  		<input type="button" value="点我显示数据" id="clickMe">
    	<table id="showTable" border="1">
    		<tr>
    			<td>姓名</td>
    			<td>身份证</td>
    			<td>错误状态</td>
    			<td>错误信息</td>
    		</tr>
    	</table>
   <script>
  		$("#clickMe").click(function(){
  			var url = "json/jsonTest.action";
  			$.ajax({
  				type:'get',
  				url:url,
  				dataType: 'json',
  				success:function(data){
  					$.each(data,function(i,list){
  						var _tr = $("<tr><td>"+list.name+"</td><td>"+
  								  list.idCard+"</td><td>"+list.status+
  								  "</td><td>"+list.message+"</td></tr>");
  						$("#showTable").append(_tr);
  					})
  				}
  			})
  			
  		})
  	</script>
  </body>
</html>

3、Action处理类(JsonTest_01.java)

/**
 *@Project: jsonTest
 *@Author: chenssy
 *@Date: 2013-4-5
 *@Copyright:  chenssy All rights reserved.
 */
public class JsonTest_01 {
	public String execute() throws IOException{
		ErrorCondition r1 = new ErrorCondition("张三", "4306821989021611", "L", "长度错误");
		ErrorCondition r2 = new ErrorCondition("李四", "430682198902191112","X", "校验错误");
		ErrorCondition r3 = new ErrorCondition("王五", "", "N", "身份证信息为空");
		
		List<ErrorCondition> list = new ArrayList<ErrorCondition>();
		list.add(r1);
		list.add(r2);
		list.add(r3);
		
		//将list转化成JSON对象
		JSONArray jsonArray = JSONArray.fromObject(list);
		HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);
		response.setCharacterEncoding("UTF-8"); 
		response.getWriter().print(jsonArray);
		return null;
	}
}

4、struts.xml配置

<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
	"http://struts.apache.org/dtds/struts-2.1.7.dtd">
	<!-- 指定struts 2的配置文件的跟元素  -->
<struts>
	<package name="json" namespace="/json" extends="struts-default">
		<action name="jsonTest" class="com.json.action.JsonTest_01" method="execute"></action>
	</package>
</struts>

三、运行结果

开始页面如下：

当点击按钮后

返回的结果如下：