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。