Spring Boot 整合之druid

1.导入依赖

        <!-- springboot,mybatis 整合包 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- springboot,druid 整合包 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--web-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--tomcat-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <!--test-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

2.配置application.properties

#数据连接
spring.datasource.druid.driverClassName=com.mysql.jdbc.Driver
spring.datasource.druid.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.datasource.druid.username=root
spring.datasource.druid.password=root123

spring.datasource.druid.initialSize=5
spring.datasource.druid.minIdle=5
spring.datasource.druid.maxActive=20
spring.datasource.druid.maxWait=60000
spring.datasource.druid.timeBetweenEvictionRunsMillis=60000
spring.datasource.druid.min-evictableIdleTimeMillis=300000
spring.datasource.druid.validationQuery=SELECT 1 FROM DUAL
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=false
spring.datasource.druid.testOnReturn=false
spring.datasource.druid.poolPreparedStatements=true
spring.datasource.druid.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.druid.filters=stat,wall

# mybatis 配置
mybatis.config-location=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

3.编程

@Configuration
public class DruidConfiguration {


    //引用application.yml中的配置
    @ConfigurationProperties(prefix = "spring.datasource.druid")
    @Bean
    public DataSource druid(){
        return new DruidDataSource();
    }

    /**
     * 配置Druid的监控
     *  1、配置一个管理后台的Servlet
     * @return
     */
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean bean=new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        Map<String,String> initParams=new HashMap<>();
        //白名单：
        initParams.put("allow","");//默认就是允许所有访问
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        initParams.put("deny","192.20.10.5");
        //Druid监控后台登录账号密码
        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","123456");
        bean.setInitParameters(initParams);
        return bean;
    }

    /**
     *  2、配置一个web监控的filter
     * @return
     */
    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        filterRegistrationBean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid2/*");
        return filterRegistrationBean;
    }
}

4.创建实体类

public class User {

    private Integer uId;

    private String uName;
}

此处省略setter和getter

5.创建接口

public interface UserDao {

    int insertUser(User user);

    User getUserById(Integer uid);

    int updateUser(User user);

    int deleteUserById(Integer uid);
}

6.添加配置文件

6.1 创建mybatis-config.xml (resources\mybatis 文件夹自己创)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
    <settings>
        <!-- 获取数据库自增主键值 -->
        <setting name="useGeneratedKeys" value="true"/>
        <!-- 使用列别名替换列名，默认为 true -->
        <setting name="useColumnLabel" value="true"/>
        <!-- 开启驼峰命名转换：Table(create_time) => Entity(createTime) -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

6.2 创建UserMapper.xml (resources\mybatis\mapper 文件夹自己创)

<?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="club.lygangdai.dao.UserDao">

    <insert id="insertUser" parameterType="club.lygangdai.pojo.User">
        insert into t_user(u_name) values(#{uName})
    </insert>

    <select id="getUserById" parameterType="java.lang.Integer" resultType="club.lygangdai.pojo.User">
        select u_id,u_name from t_user where u_id = #{uId}
    </select>

    <update id="updateUser" parameterType="club.lygangdai.pojo.User">
        update t_user set u_name = #{uName} where u_id = #{uId}
    </update>

    <delete id="deleteById" parameterType="java.lang.Integer">
        delete from t_user where u_id = #{uId}
    </delete>

</mapper>

注意：在启动类添加注解 @MapperScan(dao包路径)

7.测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootDruidApplicationTests {

    @Autowired
    private UserDao userDao;

    @Test
    public void contextLoads() {
        User user = userDao.getUserById(1);
        System.out.println(user);
    }

}

结果图如下：