SpringBoot学习：整合MyBatis，使用Druid连接池

项目下载地址：http://download.csdn.NET/detail/aqsunkai/9805821

（一）添加pom依赖：

<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.2.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>6.0.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.29</version>
</dependency>

（二）项目结构如下：

mapper接口在java目录下，相应的写sql语句的xml在resource目录下，在Application启动类中加入注解：

@ServletComponentScan
@MapperScan("com.sun.**.mapper") //配置扫描mapper接口的地址

@ServletComponentScan 设置启动时spring能够扫描到我们自己编写的servlet和filter, 用于Druid监控

@MapperScan 用于扫描的mapper接口

在配置文件中加入：

# mybatis_config
mybatis:
    mapper-locations: classpath:mapper/**/*.xml
#datasource
spring:
    datasource:
        name: era
        url: jdbc:mysql://localhost:3306/spring_boot?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
        username: root
        password: 123456
        # 使用druid数据源
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        # 下面为连接池的补充设置，应用到上面所有数据源中
        # 初始化大小，最小，最大
        initialSize: 5
        minIdle: 5
        maxActive: 20
        # 配置获取连接等待超时的时间
        maxWait: 60000
        # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
        timeBetweenEvictionRunsMillis: 60000
        # 配置一个连接在池中最小生存的时间，单位是毫秒
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT 1 FROM DUAL
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        # 打开PSCache，并且指定每个连接上PSCache的大小
        poolPreparedStatements: true
        maxPoolPreparedStatementPerConnectionSize: 20
        # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
        spring.datasource.filters: stat,wall,log4j
        # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
        connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
        # 合并多个DruidDataSource的监控数据
        #useGlobalDataSourceStat: true

用于扫描mybatis的映射文件xml，和加载连接池

日志文件中加入：

<!--输出sql语句-->
<logger name="com.sun" level="debug" />

用于在控制台打印sql语句

DataSource的配置启动管理类如下：

package com.sun.configuration;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import com.alibaba.druid.support.spring.stat.DruidStatInterceptor;
import org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

@Configuration
@EnableTransactionManagement
/**
 * Druid的DataResource配置类
 * 凡是被Spring管理的类，实现接口 EnvironmentAware 重写方法 setEnvironment 可以在工程启动时，
 * 获取到系统环境变量和application配置文件中的变量。 还有一种方式是采用注解的方式获取 @value("${变量的key值}")
 * 获取application配置文件中的变量。 这里采用第一种要方便些
 * Created by sun on 2017-1-20.
 */
public class DruidDataSourceConfig implements EnvironmentAware {

    private RelaxedPropertyResolver propertyResolver;

    public void setEnvironment(Environment env) {
        this.propertyResolver = new RelaxedPropertyResolver(env, "spring.datasource.");
    }

    @Bean
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(propertyResolver.getProperty("url"));
        datasource.setDriverClassName(propertyResolver.getProperty("driver-class-name"));
        datasource.setUsername(propertyResolver.getProperty("username"));
        datasource.setPassword(propertyResolver.getProperty("password"));
        datasource.setInitialSize(Integer.valueOf(propertyResolver.getProperty("initialSize")));
        datasource.setMinIdle(Integer.valueOf(propertyResolver.getProperty("minIdle")));
        datasource.setMaxWait(Long.valueOf(propertyResolver.getProperty("maxWait")));
        datasource.setMaxActive(Integer.valueOf(propertyResolver.getProperty("maxActive")));
        datasource.setMinEvictableIdleTimeMillis(
                Long.valueOf(propertyResolver.getProperty("minEvictableIdleTimeMillis")));
        try {
            datasource.setFilters("stat,wall");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return datasource;
    }

    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
        servletRegistrationBean.setServlet(new StatViewServlet());
        servletRegistrationBean.addUrlMappings("/druid/*");
        Map<String, String> initParameters = new HashMap<String, String>();
        // initParameters.put("loginUsername", "druid");// 用户名
        // initParameters.put("loginPassword", "druid");// 密码
        initParameters.put("resetEnable", "false");// 禁用HTML页面上的“Reset All”功能
        initParameters.put("allow", "127.0.0.1"); // IP白名单 (没有配置或者为空，则允许所有访问)
        // initParameters.put("deny", "192.168.20.38");// IP黑名单
        // (存在共同时，deny优先于allow)
        servletRegistrationBean.setInitParameters(initParameters);
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }

    // 按照BeanId来拦截配置 用来bean的监控
    @Bean(value = "druid-stat-interceptor")
    public DruidStatInterceptor DruidStatInterceptor() {
        DruidStatInterceptor druidStatInterceptor = new DruidStatInterceptor();
        return druidStatInterceptor;
    }

    @Bean
    public BeanNameAutoProxyCreator beanNameAutoProxyCreator() {
        BeanNameAutoProxyCreator beanNameAutoProxyCreator = new BeanNameAutoProxyCreator();
        beanNameAutoProxyCreator.setProxyTargetClass(true);
        // 设置要监控的bean的id
        //beanNameAutoProxyCreator.setBeanNames("sysRoleMapper","loginController");
        beanNameAutoProxyCreator.setInterceptorNames("druid-stat-interceptor");
        return beanNameAutoProxyCreator;
    }

}

后台执行在控制台上输出：

2017-04-07 21:25:15.904  INFO 10500 --- [io-8080-exec-10] c.s.p.controller.UserController          : 哈哈哈
2017-04-07 21:25:15.908 DEBUG 10500 --- [io-8080-exec-10] c.s.p.m.UserMapper.selectByPrimaryKey    : ==>  Preparing: select id, nickname, email, pswd, create_time, last_login_time, status from sys_user where id = ? 
2017-04-07 21:25:15.911 DEBUG 10500 --- [io-8080-exec-10] c.s.p.m.UserMapper.selectByPrimaryKey    : ==> Parameters: 1(Integer)
2017-04-07 21:25:15.918 DEBUG 10500 --- [io-8080-exec-10] c.s.p.m.UserMapper.selectByPrimaryKey    : <==      Total: 1
2017-04-07 21:25:15.920  INFO 10500 --- [io-8080-exec-10] c.s.p.controller.UserController          : admin

在页面上输入http://localhost:8080/boot/druid/可以看到监控到的sql语句执行情况：