springboot2.x配置druid sql监控

　　后端接口响应慢，通常我们就需要优化代码和sql，如果项目中使用druid连接池，那么我们可以利用其提供的sql监控功能，来帮助我们快速定位慢sql已经sql执行次数等问题，springboot2之后，durid监控配置变的更简单了，不需要额外的代码，只需要添加配置即可。整个项目配置如下：

　　依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

　　application.yml

spring:
  datasource:
    druid:
      url: jdbc:postgresql://127.0.0.1:5432/test01?characterEncoding=utf-8
      username: admin
      password: 123456
      driver-class-name: org.postgresql.Driver
      initial-size: 1
      max-active: 20
      max-wait: 6000
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      connection-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=2000
      min-idle: 1
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 300000
      validation-query: select 1
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      web-stat-filter:
        enabled: true
        url-pattern: "/*"
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
        session-stat-max-count: 1000
        session-stat-enable: true
        profile-enable: true
      stat-view-servlet:
        enabled: true
        url-pattern: "/druid/*"
        login-username: root
        login-password: root
        allow: 127.0.0.1
        reset-enable: true

    type: com.alibaba.druid.pool.DruidDataSource
    url:
    username: admin
    password: 123456
    driver-class-name:
    filters: stat,wall,slf4j
    maxActive: 20
  jpa:
    database: postgresql
    show-sql: true
    properties:
      hibernate:
        temp:
          use_jdbc_metadata_defaults: false

　　测试添加的相关类

package com.junlin.druid.Entity;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name="newtable")
public class DemoEntity implements Serializable {

    @Id
    @GeneratedValue
    @Column(name="id")
    private int id;

    @Column(name="name")
    private String name;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.junlin.druid.Dao;

import com.junlin.druid.Entity.DemoEntity;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface DemoJPA  extends JpaRepository<DemoEntity,Integer> {

    List<DemoEntity> findByName(String name);
}

package com.junlin.druid.Controller;

import com.junlin.druid.Dao.DemoJPA;
import com.junlin.druid.Entity.DemoEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class DemoController {

    @Autowired
    private DemoJPA demoJPA;

    @GetMapping("/findName")
    public Object findEntity(String name){
        List<DemoEntity> list = demoJPA.findByName(name);
        return list;
    }
}

　　启动项目，访问localhost:8080/druid/,进入登陆页面输入在application.yml配置好的用户和密码(demo中都是root)，即可看到监控页面

　　访问一下我们准备好的接口，执行几次sql查询，在监控页面点看sql监控页面，就能看到我们的sql执行情况

　　其它相关的配置以及页面相关内容可以参考druid官网文档，地址https://github.com/alibaba/druid/wiki/常见问题