SpringBoot+Mybatis+MySql

(注：第一次写不喜勿喷)

1：前提安装好JDK ,IDEA,MAVEN 此处不多赘述 ，不会的同学请先进行学习

2：File→New →Project

    

    

    

    

3: pom.xml 信息

    4.0.0

    com.boot
    yunxiaodefengdemo
    0.0.1-SNAPSHOT
    jar

    yunXiaoDeFengDemo
    Demo project for Spring Boot

    
        org.springframework.boot
        spring-boot-starter-parent
        1.5.9.RELEASE
         
    

    
        UTF-8
        UTF-8
        1.8
    

    
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.springframework.boot
            spring-boot-starter-test
        

        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.0
        
        
        
            mysql
            mysql-connector-java
            runtime
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

4：在src\main\resources找到 application.properties 改名为application.yml

    注意：需要填写信息时请在冒号后面空格，否则数据无效

#端口号
server:
  port: 82

#数据库链接设置
spring:
 datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: root

#整合Mybatis
mybatis:
#  扫描数据持久对应的实体类 路径 Package级别
  type-aliases-package: com.boot.yunxiaodefengdemo.entity
#  mybatis 对应的 .xml文件路径
  mapper-locations: classpath:mapper/*.xml
#  多层级目录  mapper-locations: classpath:mapper/**/**.xml


#  打印 sql 扫描dao层

logging:
  level:
    com:
      boot:
       yunxiaodefengdemo:
        Dao:  debug

5:  创建controlelr 、service、dao、entity

    

(Service,Dao,entity同上步骤)

6：Controller中创建接口,Service中创建接口和实现类，Dao创建接口，Entity创建User实体

Controller代码如下              

package com.boot.yunxiaodefengdemo.Controller;

import com.boot.yunxiaodefengdemo.Entity.User;
import com.boot.yunxiaodefengdemo.Service.UserService;
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;

/**
 * 〈一句话功能简述〉

 * 〈〉
 *
 * @author yunXiaoDeFeng
 * @create 2018/7/2
 * @since 1.0.0
 */
@RestController
@RequestMapping("user")
public class UserController {
    @Autowired
    private UserService userService;

    @RequestMapping(method = RequestMethod.GET)
    public List hello(){
        List hello=null;
        try {
          hello = userService.hello( );
        }catch (Exception e){
            System.out.println(e );
        }
        return hello;
    }
}

Service代码如下

    接口

package com.boot.yunxiaodefengdemo.Service;

import com.boot.yunxiaodefengdemo.Entity.User;

import java.util.List;

/**
 * 〈一句话功能简述〉

 * 〈〉
 *
 * @author yunXiaoDeFeng
 * @create 2018/7/2
 * @since 1.0.0
 */
public interface UserService {

    List hello()throws Exception;
}

    实现类

package com.boot.yunxiaodefengdemo.Service.impl;

import com.boot.yunxiaodefengdemo.Dao.UserMapper;
import com.boot.yunxiaodefengdemo.Entity.User;
import com.boot.yunxiaodefengdemo.Service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 〈一句话功能简述〉

 * 〈〉
 *
 * @author yunXiaoDeFeng
 * @create 2018/7/2
 * @since 1.0.0
 */
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;


    @Override
    public List hello()throws Exception {
        return userMapper.hello();
    }
}

Dao代码如下

package com.boot.yunxiaodefengdemo.Dao;

import com.boot.yunxiaodefengdemo.Entity.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * 〈一句话功能简述〉

 * 〈〉
 *
 * @author yunXiaoDeFeng
 * @create 2018/7/2
 * @since 1.0.0
 */
@Mapper
//注意：别忘了此注解 注入Bean 
public interface UserMapper {

    List hello()throws Exception;
}

Entity代码如下

package com.boot.yunxiaodefengdemo.Entity;

/**
 * 〈一句话功能简述〉

 * 〈〉
 *
 * @author yunXiaoDeFeng
 * @create 2018/7/2
 * @since 1.0.0
 */
public class User {
    private Integer id;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}    

usermapper.xml

  
  id,name
  
          
  
  
    select  
    from userdemo
  

7 最终的包结构

    

8：控制台打印 为以下信息证明启动成功

    

9：浏览器 输入http://127.0.0.1:82/user

10 : 控制台打印出sql