ajax+json+Struts2实现list传递实例讲解

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>

</head>
<body>
<input type="button" value="点我显示数据"
id="clickMe">
<table id="showTable" border="1">
<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">

<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：