Struts2+jQuery+Json零配置实现ajax

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（一）Jsp页面代码

<%@ 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%>"> <title>My JSP 'index.jsp' starting page</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"><mce:script type="text/javascript" src="js/jquery-1.6.1.js" mce_src="js/jquery-1.6.1.js"></mce:script><mce:script type="text/javascript"></mce:script> </head> <body> <input type="button" id="keyValue" value="提交/接收数据（键值对）" /> <br> <input type="button" id="str" value="接收字符串" /> <br> <input type="button" id="objList" value="接收对象列表" /> <br> </body></html> （二）Action代码

package com.pyz.action;import java.util.HashMap;import java.util.Map;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.JSONSerializer;import org.apache.struts2.ServletActionContext;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.ParentPackage;import org.apache.struts2.convention.annotation.Result;import com.opensymphony.xwork2.ActionSupport;@ParentPackage("json-default")public class JsonTestAction extends ActionSupport {private static final long serialVersionUID = 1L;//返回json格式的数据 private String result;@Action(value="/jsonTest/str",results={@Result(name="success", type="json", params={"root","result"})})public String str(){String name = ServletActionContext.getRequest().getParameter("name");String age = ServletActionContext.getRequest().getParameter("age");this.result = "aaa";return SUCCESS;}@Action(value="/jsonTest/keyValue",results={@Result(name="success", type="json", params={"root","result"})})public String keyValue(){String name = ServletActionContext.getRequest().getParameter("name");String age = ServletActionContext.getRequest().getParameter("age");////方法一，直接创建JSON对象//JSONObject jo = new JSONObject();//jo.element("name", name);//jo.element("age", age);////方法二，JAVABEAN转JSON对象//User user = new User();//user.setName("pyz");//user.setAge(19);//JSONObject jo = (JSONObject)JSONObject.fromObject(user);////JSONObject jo = (JSONObject)JSONSerializer.toJSON(user);//等于上语句//方法三，MAP转JSON对象Map<String, Object> map = new HashMap<String, Object>();map.put("name", "pyz");map.put("age", 19);JSONObject jo = (JSONObject)JSONObject.fromObject(map);//JSONObject jo = (JSONObject)JSONSerializer.toJSON(user);//等于上语句this.result = jo.toString();return SUCCESS;}@Action(value="/jsonTest/objList",results={@Result(name="success", type="json", params={"root","result"})})public String objList(){String name = ServletActionContext.getRequest().getParameter("name");String age = ServletActionContext.getRequest().getParameter("age");//方法一，直接创建JSON对象JSONObject jo = new JSONObject();jo.element("name", name);jo.element("age", age);JSONObject jo1 = new JSONObject();jo1.element("name", "ty");jo1.element("age", "29");//同理，可以将JAVABEAN、MAP对象转换成JSON对象，再添加到JSONArray中JSONArray ja = new JSONArray();ja.add(jo);ja.add(jo1);this.result = ja.toString();return SUCCESS;}public String getResult() {return result;}public void setResult(String result) {this.result = result;}public class User{private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}}