Java中SpringBoot与2.SpringBoot整合Mybatis的实例

一、创建Springboot的配置文件：application.properties，并添加MyBatis依赖

SpringApplication 会从 application.properties 文件中加载配置信息，下面是添加Spring配置信息的文件目录顺序：

1. 当前目录下的/config子目录中

2. 当前目录中

3. 一个 classpath 包下的 /config 目录中

4. classpath 根目录中

　大家根据自己习惯来即可。

（1）application.properties 文件配置如下：

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1/test
spring.datasource.username=root
spring.datasource.password=root

（2）添加 MyBatis 以及 MYSQL

        <!-- SpringBoot - MyBatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.0</version>
        </dependency>
        <!-- Mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

二、创建POJO、Mapper、Service 以及 Controler

（1）User.java

package org.rcddup.app.domain;public class User {    
private Long id;    
private String name;    
private Short age;    
private Short status;    
public Long getId() {        
return id;
    }    
    public void setId(Long id) {        
    this.id = id;
    }    
    public String getName() {        
    return name;
    }    
    public void setName(String name) {        
    this.name = name;
    }    
    public Short getAge() {        
    return age;
    }    
    public void setAge(Short age) {        
    this.age = age;
    }    
    public Short getStatus() {        
    return status;
    }    
    public void setStatus(Short status) {        
    this.status = status;
    }

}

（2）UserMapper.java

package org.rcddup.app.dao;
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.rcddup.app.domain.User;

@Mapperpublic interface UserMapper {
    
    @Select("select id, name, age, status from user")
    List<User> listUser();
    
    @Select("select id, name, age, status from user where id=#{id}")
    User getUserById(Long id);
    
}

（3）IUserService.java

package org.rcddup.app.service;
import java.util.List;
import org.rcddup.app.domain.User;
public interface IUserService {
    
    List<User> listUser();
    
    User getUserById(Long id);
    
}

（4）UserService.java

package org.rcddup.app.service.impl;
import java.util.List;
import org.rcddup.app.dao.UserMapper;
import org.rcddup.app.domain.User;
import org.rcddup.app.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Servicepublic class UserService implements IUserService{
    
    @Autowired    
    private UserMapper userMapper;
    
    @Override    
    public List<User> listUser() {        
    return userMapper.listUser();
    }

    @Override    
    public User getUserById(Long id) {        
    return userMapper.getUserById(id);
    }
    
}

（5）UserController.java

package org.rcddup.app.web.controller;
import java.util.List;
import org.rcddup.app.domain.User;
import org.rcddup.app.service.IUserService;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")public class UserController {
    
    @Autowired    
    private IUserService userService;
    
    @RequestMapping("/list")    
    public List<User> list() {        
    return userService.listUser();
    }
    
    @RequestMapping("/get")    
    public User list(Long id) {        
    return userService.getUserById(id);
    }
    
}

　　重新启动 App.java

　　输入：http://localhost:8080/user/get?id=1

　　输入：http://localhost:8080/user/list

　　到此，SpringBoot整合Mybatis就成功了。

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