Springboot整合Druid，添加拦截器进行数据监控

1、在项目中添加Druid依赖，https://mvnrepository.com/，
在其中搜索“druid”，选择相应版本，复制Maven格式到项目的pom文件中；

2、添加与数据库相关的属性配置

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://10.0.75.1:3306/demo
    driver-class-name: com.mysql.cj.jdbc.Driver
#以下是项目运行即执行SQL文件的配置，文件放在类路径下
    schema:
      - classpath:department.sql
     initialization-mode: always

3、新建Druid的配置文件类DruidConfig，把配置文件中spring.datasource下的属性绑定到Druid属性中；

package com.backman.datademo.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration
public class DruidConfig {

    @ConfigurationProperties("spring.datasource")
    @Bean
    public DataSource Druid(){
        DruidDataSource dataSource = new DruidDataSource();
        return dataSource;
    }
}

4、在配置文件中加入Druid对应的属性配置，YML配置注意层级关系

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://10.0.75.1:3306/demo
    driver-class-name: com.mysql.cj.jdbc.Driver
    schema:
      - classpath:department.sql
    initialization-mode: always
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    # 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，此处是filter修改的地方
    filters:
      commons-log.connection-logger-name: 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

5、为Druid配置Servlet和相应的Filter

package com.backman.datademo.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.servlet.Filter;
import javax.servlet.Servlet;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {

    @ConfigurationProperties("spring.datasource")
    @Bean
    public DataSource Druid(){
        DruidDataSource dataSource = new DruidDataSource();
        return dataSource;
    }

    //配置监控
    //1、先配置管理后台的servLet，访问的入口为/druid/
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<Servlet> bean = new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");
        Map<String,String> map = new HashMap<>();
        map.put("loginUsername","admin");
        map.put("loginPassword","123456");
        map.put("deny","192.168.47.156");
        bean.setInitParameters(map);
        return bean;
    }

    //2、配置WEB监控的filter
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
        bean.setFilter(new WebStatFilter());
        Map<String,String> map = new HashMap<>();
        map.put("exclusions","*.js,*.css,/druid/*");
        //拦截所有请求
        bean.setUrlPatterns(Arrays.asList("/*"));
        bean.setInitParameters(map);
        return bean;
    }
}

6、启动项目运行：localhost:8080/druid，使用配置的用户名与密码登，即可显示监控界面；