ajax+json+Struts2实现list传递实例讲解

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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)

复制代码代码如下:

 
/** 
*@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)

复制代码代码如下:

 
<%@ 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)

复制代码代码如下:

 
/** 
*@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

复制代码代码如下:

 
<?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：