实现原理：从Action中返回JSON格式的字符串，在ajax中获取到data,并将其转换成js的JSON数据，然后遍历
注：亦可在Java代码就转换为JSON格式，使用JSONArrayjsonArray=JSONArray.fromObject(string)，写write(jsonArray.toString());这时在JS里就不需要使用eval()转换直接遍历
Struts.xml
<action name="myAjaxAction" class="myAction" method="myAjaxAction"><interceptor-ref name="mystack" /></action>
Action方法
public void myAjaxAction(){
try{
HttpServletResponse responses = ServletActionContext.getResponse();
responses.setCharacterEncoding("utf-8");
PrintWriter writer = responses.getWriter();
//设置JSON数据，\"是转义符，实际内容为：[{name:"张三",age:12},{name:"李四",age:11},{name:"王五",age:13},{name:"小六",age:14}]；
String string="[{name:\"张三\",{name:\"李四\",{name:\"王五\",{name:\"小六\",age:14}]";
writer.write(string);
writer.flush();
writer.close();
}catch (Exception e) {
// Todo: handle exception
}
}
HTML
<input type="button" value="测试JSON" onclick="ajaxJson()"/>
JS代码
function ajaxJson(){
$.ajax({
type:"post",url:"myAjaxAction.action",async:true,success:function(data) {
var obj=eval("("+data+")");//将数据转换成json类型
for(var i in obj){//遍历Json数据
alert("姓名:"+obj[i].name+" 年龄:"+obj[i].age );
}
},error:function(e) {
alert("验证失败!");
}
});
}