java省市级联下拉菜单实例代码

java省市级联下拉菜单实例代码

本文实例为大家分享了java省市级联的具体代码，供大家参考，具体内容如下

1.LoadAreaServlet.java

package com.scce.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

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 com.scce.pojo.City;

import com.scce.pojo.Prov;

public class LoadAreaServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

this.doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");

request.setCharacterEncoding("utf-8");

PrintWriter out = response.getWriter();

ArrayList provs = new ArrayList();

String provinceID = request.getParameter("provinceID");

if (provinceID=="" || provinceID==null) {

System.out.println("加载地级市信息");

Prov pro1 = new Prov();

pro1.setId(0);

pro1.setProvinceName("湖北");

Prov pro2 = new Prov();

pro2.setId(1);

pro2.setProvinceName("湖南");

Prov pro3 = new Prov();

pro3.setId(2);

pro3.setProvinceName("广东");

Prov pro4 = new Prov();

pro4.setId(3);

pro4.setProvinceName("广西");

provs.add(pro1);

provs.add(pro2);

provs.add(pro3);

provs.add(pro4);

System.out.println(JSONArray.fromObject(provs).toString()); //[{"id":0,"provinceName":"湖北"},{}]

out.print(JSONArray.fromObject(provs).toString());

}else{

ArrayList citys = new ArrayList();

if (provinceID.equals("0")) {

City city1 = new City();

city1.setId(0);

city1.setCityName("武汉市");

City city2 = new City();

city2.setId(1);

city2.setCityName("黄石市");

City city3 = new City();

city3.setId(2);

city3.setCityName("十堰市");

citys.add(city1);

citys.add(city2);

citys.add(city3);

}

if (provinceID.equals("1")) {

City city1 = new City();

city1.setId(0);

city1.setCityName("长沙市");

City city2 = new City();

city2.setId(1);

city2.setCityName("岳阳市");

City city3 = new City();

city3.setId(2);

city3.setCityName("湘潭市");

citys.add(city1);

citys.add(city2);

citys.add(city3);

}

System.out.println(JSONArray.fromObject(citys).toString());

out.print(JSONArray.fromObject(citys).toString());

}

}

}

2.test1.html

省：

数据加载中..

市：

数据加载中..

以上就是本文的全部内容，希望对大家学习java程序设计有所帮助。

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