jquery+json制作级联菜单（包含json及其所有依赖jar包）

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 AjaxServlet 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 { String p_id = request.getParameter("p_id"); Integer pid = p_id == null ? null : Integer.parseInt(p_id.toString()); //模拟从数据库中查询出来 List list = new ArrayList(); if(pid == 1001){ ShiEntity s1 = new ShiEntity(); s1.setS_id(1001); s1.setS_name("武汉"); ShiEntity s2 = new ShiEntity(); s2.setS_id(1002); s2.setS_name("荆州"); ShiEntity s3 = new ShiEntity(); s3.setS_id(1003); s3.setS_name("襄阳"); ShiEntity s4 = new ShiEntity(); s4.setS_id(1004); s4.setS_name("荆门"); list.add(s1); list.add(s2); list.add(s3); list.add(s4); }else if(pid == 1002){ ShiEntity s1 = new ShiEntity(); s1.setS_id(1005); s1.setS_name("长沙"); ShiEntity s2 = new ShiEntity(); s2.setS_id(1006); s2.setS_name("岳阳"); list.add(s1); list.add(s2); }else if(pid == 1003){ ShiEntity s1 = new ShiEntity(); s1.setS_id(1007); s1.setS_name("深圳"); ShiEntity s2 = new ShiEntity(); s2.setS_id(1008); s2.setS_name("东莞"); ShiEntity s3 = new ShiEntity(); s3.setS_id(1009); s3.setS_name("广州"); list.add(s1); list.add(s2); list.add(s3); }else if(pid == 1004){ ShiEntity s1 = new ShiEntity(); s1.setS_id(1010); s1.setS_name("重庆"); list.add(s1); } String jsonText = JSONArray.fromObject(list).toString(); System.out.println(jsonText); response.setCharacterEncoding("UTF-8"); response.getWriter().write(jsonText); } }