AJAX省市县三级联动
效果
开发结构参考AJAX,JSON用户校验
主要有两个核心文件
1，处理输入字符，进行后台搜索的servlet
linkage.java
package org.guangsoft.servlet; import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
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 org.guangsoft.bean.Address;
import org.guangsoft.dao.SqlHelper; import com.google.gson.Gson; public class Linkage extends HttpServlet
{ public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);
} protected void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out = response.getWriter();
String provinceNo = request.getParameter("provinceNo");
String cityNo = request.getParameter("cityNo");
Connection connection = null;
PreparedStatement prepareStatement = null;
ResultSet resultSet = null;
try
{
String sql = "";
connection = SqlHelper.getConnection();
if(cityNo != null && cityNo != "")
{
sql = "select code,name from area where citycode = ?";
prepareStatement = connection.prepareStatement(sql);
prepareStatement.setString(1,cityNo);
}
else if(provinceNo != null && provinceNo != "")
{
sql = "select code,name from city where provincecode = ?";
prepareStatement = connection.prepareStatement(sql);
prepareStatement.setString(1,provinceNo);
}
else
{
sql = "select code,name from province";
prepareStatement = connection.prepareStatement(sql);
} resultSet = prepareStatement.executeQuery();
List<Address> addrList = new ArrayList<Address>();
while(resultSet.next())
{
Address address = new Address();
address.setAreaNo(resultSet.getString("code"));
address.setAreaName(resultSet.getString("name"));
addrList.add(address);
}
Gson gson = new Gson();
response.getWriter().print(gson.toJson(addrList));
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
SqlHelper.close(connection, prepareStatement, resultSet);
}
} }
2，展示前台
linkage.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<script src="/ajax/js/AjaxUtil.js"></script>
<script>
function getProvince()
{
sendAjaxReq("get","linkage",null,function(data)
{
eval("var addrList="+data);
var province = document.getElementById("province");
for(var i = 0; i < addrList.length; i++)
{
var address = addrList[i];
province.innerHTML += "<option value="+address.areaNo+">"+address.areaName+"</option>";
}
});
}
function getCity(provinceNo)
{
sendAjaxReq("get","/ajax/linkage?provinceNo="+provinceNo,null,function(data)
{
eval("var addrList="+data);
var city = document.getElementById("city");
city.innerHTML="<option value='0'>---请选择---</option>";
for(var i = 0; i < addrList.length; i++)
{
var address = addrList[i];
city.innerHTML += "<option value="+address.areaNo+">"+address.areaName+"</option>";
}
});
}
function getArea(cityNo)
{
sendAjaxReq("get","/ajax/linkage?cityNo="+cityNo,null,function(data)
{
eval("var addrList="+data);
var area = document.getElementById("area");
area.innerHTML="<option value='0'>---请选择---</option>";
for(var i = 0; i < addrList.length; i++)
{
var address = addrList[i];
area.innerHTML += "<option value="+address.areaNo+">"+address.areaName+"</option>";
}
});
}
</script>
</head> <body onload="getProvince();">
省：<select id="province" onchange="getCity(this.value);">
<option value="0">---请选择---</option>
</select>
市：<select id="city" onchange="getArea(this.value);">
<option value="0">---请选择---</option>
</select>
区：<select id="area">
<option value="0">---请选择---</option>
</select>
</body>
</html>
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