前端js部分連結

以下從controller層開始： 

package com.bootdo.common.controller;

import com.bootdo.common.domain.City;
import com.bootdo.common.domain.Province;
import com.bootdo.common.service.SiteService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.List;

@RequestMapping("/site")
@Controller
public class SiteController implements Serializable{
    private static final long serialVersionUID = 1L;

    @Autowired
    SiteService siteService;





    @GetMapping("/get_Province")
    @ResponseBody()
    public List<Province> initProvince() {
        return siteService.getAllProvince();
    }

    @GetMapping("/get_city")
    @ResponseBody()
    public List<City> getCity(HttpServletRequest request) {
        String codeP = request.getParameter("codeP");
        return siteService.getCity(codeP);
    }

    @GetMapping("/get_area")
    @ResponseBody()
    public List<Province> getArea(HttpServletRequest request) {
        String codeC = request.getParameter("codeC");
        List<Province> list = siteService.getArea(codeC);
        return list;
    }

}
 

在Java的開發中，controller層是連線前端和後端的。

package com.bootdo.common.service;

import com.bootdo.common.domain.City;
import com.bootdo.common.domain.Province;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public interface SiteService {
    List<Province> getAllProvince();

    List<City> getCity(String codeP);

    List<Province> getArea(String codeC);
}
 

接受前端發來的請求，同時向後端傳送請求，——>service 層——>serviceImpl實現service層,同時連線dao層，（在dao層中同樣是介面）——>通過dao層去實現對資料庫的操作——在XML檔案中通過namespace完成連線dao層。

package com.bootdo.common.service.impl;

import com.bootdo.common.dao.AreaDao;
import com.bootdo.common.dao.CityDao;
import com.bootdo.common.dao.ProvinceDao;
import com.bootdo.common.domain.City;
import com.bootdo.common.domain.Province;
import com.bootdo.common.service.SiteService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class SiteServiceImpl implements SiteService {

    @Autowired
    ProvinceDao provinceMapper;
    @Autowired
    CityDao cityMapper;
    @Autowired
    AreaDao areaMapper;

    @Override
    public List<Province> getAllProvince() {
        List<Province> list = provinceMapper.list();
        return list;
    }

    @Override
    public List<City> getCity(String codeP) {
        return cityMapper.list(codeP);
    }

    @Override
    public List<Province> getArea(String codeC) {
        return areaMapper.list(codeC);
    }


}
 

下邊是dao層程式碼：

package com.bootdo.common.dao;

import com.bootdo.common.domain.Province;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * 系統日誌
 * @author chglee
 * @email [email protected]
 * @date 2017-10-03 15:45:42
 */
@Mapper
public interface AreaDao {

    List<Province> list(String codeC);
}

最後就是操作資料庫了。

<?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.bootdo.common.dao.AreaDao">
	<select id="list" resultType="com.bootdo.common.domain.Area" parameterType="java.lang.String">
		select `id`,`code_a`,`name`,`code_c` from area WHERE code_c= #{codeC}
	</select>
</mapper>

從這個裡邊的程式碼中可以看出來，對於不同的資料庫，不同的表操作，可以通過在serviceImple層來變換。然後寫不同的dao層和不同的XML檔案來操作。