使用jason需要导入的jar包
package com.json; public class User { String username; String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }
package com.json; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; public class TestJson extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); String str= request.getParameter("name");//得到ajax传递过来的paramater System.out.print(str); PrintWriter out = response.getWriter(); List list = new ArrayList();//传递List Map m=new HashMap();//传递Map User u1=new User(); u1.setUsername("zah"); u1.setPassword("123"); User u2=new User(); u2.setUsername("ztf"); u2.setPassword("456"); list.add(u1); //添加User对象 list.add(u2); //添加User对象 m.put("u1", u1); m.put("u2", u2); JSONArray jsonArray2 = JSONArray.fromObject( list ); //把java数组转化成转化成json对象 JSONObject jo=JSONObject.fromObject(m);//转化Map对象 out.print(jsonArray2);//返给ajax请求 out.print(jo);//返给ajax请求 } } <script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript"> function test(){ $.ajax({ type:"POST", //请求方式 url:"testjson", //请求路径 cache: false, data:"name=zah", //传参 dataType: 'json', //返回值类型 success:function(json){ alert(json[0].username+" " json[0].password); //弹出返回过来的List对象 } }); } </script> </head> <body> <input type="button" name="b" value="测试" onclick=test()> </body>