Ajax实现二级联动菜单

本文实例为大家分享了Ajax二级联动菜单的具体代码，供大家参考，具体内容如下

index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>

 
  
  
 
 
 
  
   
  
 

SelectServlet.java

package com;
 
import java.io.IOException;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SelectServlet extends HttpServlet
{
 
 private static final long serialVersionUID = 1L;
 
 public SelectServlet()
 {
  super();
 }
 
 public void destroy()
 {
  super.destroy();
 }
 
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException
 {
//  response.setCharacterEncoding("GBK");
  response.setContentType("text/xml");
  response.setHeader("Cache-Control", "no-cache");
  request.setCharacterEncoding("GBK");
  response.setCharacterEncoding("UTF-8");
  String targetId = request.getParameter("id").toString();
  System.out.println(targetId);
  // 获得请求中参数为id的值
  String xml_start = "";
  String xml_end = "";
  String xml = "";
 
  if (targetId.equalsIgnoreCase("0"))
  {
   xml = "0请选择";
  } else if (targetId.equalsIgnoreCase("1"))
  {
   xml = "1昌平";
   xml += "2丰台";
   xml += "3海淀";
   xml += "4朝阳";
  } else if (targetId.equalsIgnoreCase("2"))
  {
   xml = "1塘沽区";
   xml += "2汉沽区";
   xml += "3大港区";
   xml += "4东丽区";
  } else
  {// 如果是3,则返回下面的字符
   xml = "1济南";
   xml += "2青岛";
   xml += "3淄博";
   xml += "4枣庄";
  }
 
  String last_xml = xml_start + xml + xml_end;
  response.getWriter().write(last_xml);
 
 }
 
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException
 {
  doGet(request, response);
 }
 
 public void init() throws ServletException
 {
 }
 
}

web.xml

 
  SelectServlet
  com.SelectServlet
 
 
 
  SelectServlet
  /select
 
 
  index.jsp
 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。