Druid

1、引入依赖

 <!-- Druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.6</version>
        </dependency>

2、配置：

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    #    Spring Boot 默认是不注入这些属性值的，需要自己绑定
    #druid 数据源专有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 30000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    #配置监控拦截器filters，stat：监控统计、log4j:日志记录、wall:防御sql注入
    #如果允许时报错 Java.lang.ClassNotFoundException:org.apache.log4j.Priority
    #则导入log4j 依赖即可，Maven地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    userGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

3、创建config

package com.li.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {
//与application.yml绑定
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
   public DataSource dataSource(){
       return new DruidDataSource();
   }
//   后台监控:web.xml,ServletRegistrationBean
//    因为SpringBoot内置了serlet容器，所以没有web.xml，替代方法：ServletRegistrationBean
    @Bean
    public ServletRegistrationBean a(){
        ServletRegistrationBean<StatViewServlet> bean=new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");
//       后台监控
        HashMap<String,String> initParameters=new HashMap<>();
//       增添配置
        initParameters.put("loginUsername","admin");//登录key是固定的loginUsername,Password
        initParameters.put("loginPassword","123456");
//        允许谁能访问
        initParameters.put("allow","");
//        禁止谁能访问
//        initParameters.put("kuang","192.168.11.123");
        bean.setInitParameters(initParameters);
        return bean;
    }


//    过滤器filter
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean=new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
//        可以过滤那些请求
        Map<String,String> initParameters=new HashMap<>();
//        这些东西不进行统计
        initParameters.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParameters);
        return bean;
    }
}

在浏览器输入：

http://localhost:8080/druid

可以查看日志