spring boot+Mybatis+Druid例子

1.新建一個spring boot項目,需要選擇web和SQL下一些選項，如下圖

2.修改pom文件，增加druid包

        <!-- alibaba的druid數據庫連接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>

3.修改application.properties配置，添加數據庫配置

# 數據庫訪問配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNull&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
# 下面為連接池的補充設置，應用到上面所有數據源中
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置獲取連接等待超時的時間
spring.datasource.maxWait=60000
# 配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一個連接在池中最小生存的時間，單位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用於防火牆
spring.datasource.filters=stat,wall,log4j
spring.datasource.logSlowSql=true

4.修改application.properties配置，添加mybatis相關配置

# 注意：對應實體類的路徑,多個package之間可以用逗號
mybatis.type-aliases-package=com.example.springbootMybatis.system.model;com.example.springbootMybatis.order.model
#注意：一定要對應mapper映射xml文件的所在路徑
mybatis.mapper-locations=classpath:mapper/*.xml

5.啟動類增加mybatis的包掃描

@MapperScan("com.example.springbootMybatis.*.dao")
@EnableTransactionManagement
@SpringBootApplication
public class SpringbootMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMybatisApplication.class, args);
    }
}

6.在resources文件夾下建立mapper文件夾（和上面classpath:mapper/*.xml配置對應），在mapper文件夾下新建UserMapper.xml文件

<?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.example.springbootMybatis.system.dao.UserDao" >

    <select id="get" parameterType="string" resultType="user" >
        select id,login_name loginName,login_time loginTime from user
    </select>
  
</mapper>

由於上面配置了mybatis.type-aliases-package，所以resultType="user"這里不需要寫類的全名。

7.寫相應的service,dao,controller，

@RestController
public class UserController {
    
    @Autowired
    private UserService  userService;
    
    @GetMapping("/userInfo")
    public User getUserInfo() {
        return userService.getUserInfo("test");
    }
}

public class User {
    
    private String loginName;
    
    private Date loginTime;

    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    public Date getLoginTime() {
        return loginTime;
    }

    public void setLoginTime(Date loginTime) {
        this.loginTime = loginTime;
    }
    
    
}

@Service
public class UserService {
    @Autowired
    private UserDao userDao;
    
    public User getUserInfo(String loginName){
        return userDao.get(loginName);
    }
}

@Mapper
public interface UserDao {

    User get(String loginName);
}

 

8.整個項目結構如下:

 

注意啟動類一定要放在第一級包目錄下，如上圖，不然不能掃描controller.

 

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