因工作需要，
1，后台向前台传递一个list
2，前台向后台传递类似于list的结构，但是因为javascript不支持list类型，所以只能使用二维数组代替
后台运行后的截图： 前台运行后的截图：
后台代码（TestJson.java）
package com.zm.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import net.sf.json.JSONObject; 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 { System.out.println("into doPost"); response.setContentType("text/html"); String sName= request.getParameter("name");//得到ajax传递过来的paramater System.out.println(sName); //String sTicketId= request.getParameter("ticketId");//得到ajax传递过来的paramater //System.out.println(sTicketId); try { String[] sTicketIds = request.getParameterValues("ticketId[]"); if(sTicketIds !=null){ for(String sTicketId:sTicketIds){ System.out.println(sTicketId); } }else{ System.out.println("获取数组参数失败!"); } } catch (Exception e) { e.printStackTrace(); } PrintWriter printWriter = 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 jsonObject =JSONObject.fromObject(m);//转化Map对象 printWriter.print(jsonArray2);//返给ajax请求 //printWriter.print(jsonObject);//返给ajax请求 printWriter.flush(); printWriter.close(); System.out.println("finish"); } }
前台代码（first.jsp）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <script type="text/javascript" src="jQuery/jquery-1.9.1.min.js"></script> <script type="text/javascript"> function test2(){ var ticketId = new Array(); for(var i = 0; i < 5; i++) { ticketId.push(i); } $.ajax({ type:"POST", //请求方式 url:"./testJson", //请求路径 cache: false, data:{//传参 "name":"zhang3", "ticketId":ticketId, }, 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 alert(json[1].username+" " + json[1].password); //弹出返回过来的List对象 } }); } </script> </head> <body> <input type="button" name="b" value="TestJson" onclick="test2()"/> <input type="button" value="download file" onclick="DownURL('333.js','d:/555.js')"/> </body> </html>
web.xml
<!-- 测试jquery json--> <servlet> <servlet-name>testJson</servlet-name> <servlet-class>com.zm.servlet.TestJson</servlet-class> </servlet> <servlet-mapping> <servlet-name>testJson</servlet-name> <url-pattern>/testJson</url-pattern> </servlet-mapping>