ssm之地区表三级联动
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一、新建数据库
中国所有的省、市、县分别存储在三张表中。
1.省
CREATE TABLE `province` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`provinceID` int(11) NOT NULL,
`province` varchar(20) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=35 DEFAULT CHARSET=utf8;
2.市
CREATE TABLE `city` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`cityID` int(11) NOT NULL,
`city` varchar(20) NOT NULL,
`fatherID` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=346 DEFAULT CHARSET=utf8;
3.县
CREATE TABLE `area` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`areaID` int(11) NOT NULL,
`area` varchar(20) CHARACTER SET gbk NOT NULL,
`fatherID` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3145 DEFAULT CHARSET=utf8;
4.导入数据
二、代码实现
这里就不介绍ssm的整合了，直接三层开始：
1.bean
省
public class Province {
private Integer id;
private String province;
private Integer provinceID;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
public Integer getProvinceID() {
return provinceID;
}
public void setProvinceID(Integer provinceID) {
this.provinceID = provinceID;
}
市
public class City {
private Integer id;
private Integer fatherID;
private Integer cityID;
private String city;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getFatherID() {
return fatherID;
}
public void setFatherID(Integer fatherID) {
this.fatherID = fatherID;
}
public Integer getCityID() {
return cityID;
}
public void setCityID(Integer cityID) {
this.cityID = cityID;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
@Override
public String toString() {
return "City [id=" + id + ", fatherID=" + fatherID + ", cityID=" + cityID + ", city=" + city + "]";
}
县
public class Area {
private Integer id;
private Integer fatherID;
private Integer areaID;
private String area;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getFatherID() {
return fatherID;
}
public void setFatherID(Integer fatherID) {
this.fatherID = fatherID;
}
public Integer getAreaID() {
return areaID;
}
public void setAreaID(Integer areaID) {
this.areaID = areaID;
}
public String getArea() {
return area;
}
public void setArea(String area) {
this.area = area;
}
@Override
public String toString() {
return "Area [id=" + id + ", fatherID=" + fatherID + ", areaID=" + areaID + ", area=" + area + "]";
}
2.dao层
接口：
public interface AreaDao {
/**
* 查找所有省份
*/
public List getProvinces();
/**
* 查找所有市
*/
public List getCitys(String province);
/**
* 查找所有县
*
*/
public List getAreas(String city);
}
实现：
SELECT *FROM province
SELECT *
FROM city c
JOIN province p
ON c.fatherID=P.provinceID
WHERE province=#{province}
SELECT *
FROM area a
JOIN city c
ON a.fatherID=c.cityID
WHERE city=#{city}
3.service
接口：
public interface AreaService {
List getProvinces();
List getCity(String province);
List getArea(String city);
}
实现类：
@Service
public class AreaServiceImpl implements AreaService {
@Autowired
private AreaDao areaDao;
public List getProvinces() {
return areaDao.getProvinces();
}
public List getCity(String province) {
return areaDao.getCitys(province);
}
public List getArea(String city) {
return areaDao.getAreas(city);
}
}
4.controller
@Controller
public class AreaController {
@Autowired
private AreaService areaService;
@RequestMapping("/area")
public String toArea() {
return "area";
}
@RequestMapping("/getProvinces")
public String getProvinces(ModelMap map) {
List provinces = areaService.getProvinces();
map.addAttribute("provinces", provinces);
return "area";
}
@RequestMapping(value = "/getCity/{pr_name}",method = RequestMethod.GET)
@ResponseBody
public Object getCity(@PathVariable("pr_name")String province) {
List city = areaService.getCity(province);
return city;
}
@RequestMapping(value = "/getArea/{ci_name}",method = RequestMethod.GET)
@ResponseBody
public Object getArea(@PathVariable("ci_name")String city) {
System.out.println(city);
List area = areaService.getArea(city);
for (Area area2 : area) {
System.out.println(area2);
}
return area;
}
5.JSP
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
Insert title here
6.测试
好了，完了就这些。需要省市县表的可以添加小编微信
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