Spring Boot 整合 Durid数据库连接池

1.Druid简介

Druid是一个JDBC组件库，包括数据库连接池、SQL Parser等组件。DruidDataSource是最好的数据库连接池

2.maven引入druid

        
            com.alibaba
            druid
            1.1.9
        
        
            mysql
            mysql-connector-java
        

3. application.properties

具体的配置文件详解 可以参照DruidDataSource配置属性列表

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/user?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC&autoReconnect=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.jdbc.Driver
#dataSource Pool configuration
spring.datasource.initialSize=5
#最小连接池数量
spring.datasource.minIdle=5
#最大连接池数量
spring.datasource.maxActive=20
#获取连接时最大等待时间，单位毫秒。配置了maxWait之后，缺省启用公平锁，并发效率会有所下#降，如果需要可以通过配置useUnfairLock属性为true使用非公平锁。
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.druid.exceptionSorter=true
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.druid.filters=stat,wall
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 慢SQL 
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
spring.datasource.useGlobalDataSourceStat=true

4.配置 Durid dataSource

/**
* dataSource 数据源配置
*/
@Configuration
@Data
public class DruidDataSourceConfiguration {

    @Value("${spring.datasource.druid.filters}")
     private String filters ;
    @Value("${spring.datasource.druid.exceptionSorter}")
    private String exceptionSorter;
    /**
     * @see org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.Tomcat 仿写的你可以去了解
     * @return DruidDataSource
     */
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DruidDataSource dataSource() {

        DruidDataSource dataSource = new DruidDataSource();
        try {
            System.out.println(filters);
            dataSource.setFilters(filters);
            dataSource.setExceptionSorter(exceptionSorter);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return dataSource;
    }
}

5. 配置DruidStatFilter

Druid的监控统计功能是通过filter-chain扩展实现，如果你要打开监控统计功能，配置StatFilter
“`java
import com.alibaba.druid.support.http.WebStatFilter;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

/**
打开监控统计功能
*/
@WebFilter(filterName=”druidWebStatFilter”,urlPatterns=”/*”,
initParams={
@WebInitParam(name=”exclusions”,value=”.js,.gif,.jpg,.bmp,.png,.css,.ico,/druid/“)//忽略资源
}
)
public class DruidStatFilter extends WebStatFilter {
}
“`

6. 配置DruidStatViewServlet

启用Druid的内置监控页面

import com.alibaba.druid.support.http.StatViewServlet;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;

/**
 * @author hu
 * Created by hu on 2018/2/27.
 */
 //urlPatterns  指定监控页面url
@WebServlet(urlPatterns="/druid/*",
        initParams={
                @WebInitParam(name="allow",value="192.168.33.108,127.0.0.1"),// IP白名单(没有配置或者为空，则允许所有访问)
                @WebInitParam(name="deny",value="192.168.1.73"),// IP黑名单 (存在共同时，deny优先于allow)
                @WebInitParam(name="loginUsername",value="admin"),// 用户名
                @WebInitParam(name="loginPassword",value="123456"),// 密码
                @WebInitParam(name="resetEnable",value="true")// 禁用HTML页面上的“Reset All”功能
        }
)
public class DruidStatViewServlet extends StatViewServlet {
}

7. 添加@ServletComponentScan注解

需要在spring boot 启动类上面 添加@ServletComponentScan,否则监控页面的servlet 不会被加载。

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

/**
 * @author hu
 * @date 2018/5/9 17:25
 */
@ServletComponentScan
@SpringBootApplication
@EnableJpaRepositories(basePackages = "com.dream.repository")
public class DreamApplication {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(DreamApplication.class, args);
    }
}

8. 访问监控页面

• http://localhost:5000/druid/index.html

9. 参考文献

• DruidDataSource配置属性列表

• spring boot Starter配置方式

• Durid 常见问题

• 自定义存储