java省市区三级联动
MR_非凡 人气:0我搭建的是SSM 框架:
一、实现三级联动
以省市区为例:
我的想法很简单 ,可能想的有点少,首先遍历省份,当数据发生改变调用方法请求根据省的id去查询市区的信息,当市区信息发生改变调用另一个方法去查询县区的信息
1、实体类entity:area
package com.htzn.entity; public class Area { private String id ; private String name; private String pid; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPid() { return pid; } public void setPid(String pid) { this.pid = pid; } }
2、接口层 dao
package com.htzn.dao; import java.util.List; import com.htzn.entity.Area; public interface AreaDao { //获取省的信息 public List<Area> getProvince(); //获取市区信息 public List<Area> getCity(Integer pid); //获取所有县区信息 public List<Area> getArea(Integer pid); }
3、接口service层,(个人觉得两个接口层公用一个也行,就像那种公用一个的改为mapper接口层那种的也很方便,可能这样比较不规范吧)
package com.htzn.service; import java.util.List; import com.htzn.entity.Area; public interface AreaService { public List<Area> getProvince(); public List<Area> getCity(Integer pid); public List<Area> getArea(Integer pid); }
4、接口实现类serviceImpl
package com.htzn.serviceImpl; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.htzn.dao.AreaDao; import com.htzn.entity.Area; import com.htzn.service.AreaService; @Service public class AreaServiceImpl implements AreaService { @Autowired AreaDao areadao; @Override public List<Area> getProvince() { // TODO Auto-generated method stub return areadao.getProvince(); } @Override public List<Area> getCity(Integer pid) { // TODO Auto-generated method stub return areadao.getCity(pid); } @Override public List<Area> getArea(Integer pid) { // TODO Auto-generated method stub return areadao.getArea(pid); } }
5、控制器:contoller
package com.htzn.controller; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.htzn.dao.AreaDao; import com.htzn.entity.Area; @Controller public class AreaController { //自动注入 @Autowired AreaDao areadao; //获取省份映射到页面 @RequestMapping("/getpervice") public String privce(Model model) { List<Area> list = areadao.getProvince(); model.addAttribute("province", list); return "arealist"; } //根据省份id获取对应市区 @ResponseBody @RequestMapping("/getcity") public List<Area> city(@RequestParam(value="pid",required=false) Integer id) { List<Area> city = areadao.getCity(id); return city; } //根据市区id获取相应的县区 @ResponseBody @RequestMapping("/getarea") public List<Area> area(@RequestParam(value="pid",required=false) Integer id) { List<Area> area = areadao.getArea(id); return area; } }
6、最后映射页面:jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fm"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script> </head> <body> 省: <select name="province" id="province" onchange="changeCity()"> <c:forEach items="${province }" var="list"> <option value="${list.id }" >${list.name }</option> </c:forEach> </select> 市: <select id="city" name="city" onchange="changeDistrict()"> <option value="">-- 请选择市 --</option> </select> 区(县): <select id="district" name="district" onchange="changehidden()"> <option value="">-- 请选择县(区) --</option> </select> --> </body> <script type="text/javascript"> function changeCity(){ //当省的内容发生变化的时候,响应的改变省的隐藏域的值 $("#phidden").val($("#province option:selected").html()); //页面加载完成,将省的信息加载完成 //下拉列表框标签对象的val()方法就是选中的option标签的value的属性值 var pid = $("#province").val(); alert(pid); $.ajax({ url:"/sky-ssm/getcity", type:'post', data:{"pid":pid}, dataType: "json", success:function(data){ //清空城市下拉列表框的内容 $("#city").html("<option value=''>-- 请选择市 --</option>"); $("#district").html("<option value=''>-- 请选择区/县 --</option>"); //遍历json,json数组中每一个json,都对应一个省的信息,都应该在省的下拉列表框下面添加一个<option> for(var i=0;i<data.length;i++){ var $option = $("<option value='"+data[i].id+"'>"+data[i].name+"</option>"); $("#city").append($option); } }, error:function(data){ alert("失败了"); } }); } function changeDistrict(){ //当城市的内容发生变化的时候,相应的改变城市的隐藏域的值 $("#chidden").val($("#city option:selected").html()); //页面加载完成,将省的信息加载完成 //下拉列表框标签对象的val()方法就是选中的option标签的value的属性值 var pid = $("#city").val(); $.ajax({ url:"/sky-ssm/getarea", data:{"pid":pid}, dataType:"json", success:function(data){ //清空城市下拉列表框的内容 $("#district").html("<option value=''>-- 请选择区/县 --</option>"); for(var i=0;i<data.length;i++){ var $option = $("<option value='"+data[i].id+"'>"+data[i].name+"</option>"); $("#district").append($option); } } }); } function changehidden(){ //当城市的内容发生变化的时候,相应的改变城市的隐藏域的值 $("#dhidden").val($("#district option:selected").html()); } </script> </html>
7、mapper.xml文件:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.htzn.dao.AreaDao"> <resultMap id="BaseResultMap" type="com.htzn.entity.Area"> <!-- WARNING - @mbg.generated This element is automatically generated by MyBatis Generator, do not modify. This element was generated on Thu Jan 09 17:01:48 CST 2020. --> <id column="id" jdbcType="VARCHAR" property="id" /> <result column="name" jdbcType="VARCHAR" property="name" /> <result column="pid" jdbcType="VARCHAR" property="pid" /> </resultMap> <sql id="Base_Column_List"> <!-- WARNING - @mbg.generated This element is automatically generated by MyBatis Generator, do not modify. This element was generated on Thu Jan 09 17:01:48 CST 2020. --> id, name, pid </sql> <select id="getProvince" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from area where pid = 0 </select> <select id="getCity" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from area where pid = #{pid} </select> <select id="getArea" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from area where pid = #{pid} </select> <select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap"> <!-- WARNING - @mbg.generated This element is automatically generated by MyBatis Generator, do not modify. This element was generated on Thu Jan 09 17:01:48 CST 2020. --> select <include refid="Base_Column_List" /> from dept where id = #{id,jdbcType=INTEGER} </select> </mapper>
因为就是测试可不可行直接写的select下拉框,结果图:
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