第一步创建项目：

 创建项目地址：

 

 

 接下来就下载到本地了 跟着加压

 

接着用idea打开：等待资源下载完成

转存失败

 

 

 

 

 

我写了个简单的：增删改查

项目结构：

 

 

dao层:

package com.nf147.demo.dao;import com.nf147.demo.entity.News;import org.springframework.data.jpa.repository.JpaRepository;public interface NewsMapper extends JpaRepository
       
         {  //第一个参数是实体类，第二个是id的类型
       

}

 

entity层:

package com.nf147.demo.entity;import javax.persistence.*;@Entity@Table(name = "news") //表名public class News {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)  //标明该字段是自动增长    private int id;    private String title;    private String body;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getBody() {        return body;    }    public void setBody(String body) {        this.body = body;    }}

 

service层：

package com.nf147.demo.service;import com.nf147.demo.entity.News;import java.util.List;public interface NewsService {    List
       
         listAll();    void add (News news);    void del (int id);    void update(News news);}
       

 

实现服务接口：

package com.nf147.demo.service;import com.nf147.demo.dao.NewsMapper;import com.nf147.demo.entity.News;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.annotation.Cacheable;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class NewsServiceImp implements NewsService {    @Autowired    private NewsMapper newsMapper;    @Override    @Cacheable("listNews")    public List
       
         listAll() {        return newsMapper.findAll();    }    @Override    public void add(News news) {        newsMapper.save(news);    }    @Override    public void del(int id) {        newsMapper.deleteById(id);    }    @Override    public void update(News news) {        newsMapper.save(news);    }}
       

 

controller层：

package com.nf147.demo.controller;import com.nf147.demo.entity.News;import com.nf147.demo.service.NewsServiceImp;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestControllerpublic class NewsController {    @Autowired    private NewsServiceImp newsServiceImp;    //查询    @RequestMapping(value = "/listNews", method = RequestMethod.GET)    public List
       
         getNews() {        return newsServiceImp.listAll();    }    //添加 http://localhost:8082/listNewsAdd?title=标题&body=随便给的内容    @RequestMapping(value = "/listNewsAdd", method = RequestMethod.GET)    public void add(News news) {        newsServiceImp.add(news);    }    //删除    //地址栏写法 http://localhost:8082/listNewsdel?id=7    @RequestMapping(value = "/listNewsdel", method = RequestMethod.GET)    public void del(int id) {        newsServiceImp.del(id);    }    //修改    //地址栏写法  http://localhost:8082/listNewsupdate?id=6&title=好好&body=学习    @RequestMapping(value = "/listNewsupdate", method = RequestMethod.GET)    public void del(News news) {        newsServiceImp.update(news);    }}
       

 

 

测试：

转存失败

 

项目下载地址：