SpringBoot集成阿里巴巴Druid监控的示例代码

druid是阿里巴巴开源的数据库连接池，提供了优秀的对数据库操作的监控功能，本文要讲解一下springboot项目怎么集成druid。

本文在基于jpa的项目下开发，首先在pom文件中额外加入druid依赖，pom文件如下：

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
   xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelversion>4.0.0</modelversion>

 <groupid>com.dalaoyang</groupid>
 <artifactid>springboot_druid</artifactid>
 <version>0.0.1-snapshot</version>
 <packaging>jar</packaging>

 <name>springboot_druid</name>
 <description>springboot_druid</description>

 <parent>
  <groupid>org.springframework.boot</groupid>
  <artifactid>spring-boot-starter-parent</artifactid>
  <version>1.5.12.release</version>
  <relativepath/> <!-- lookup parent from repository -->
 </parent>

 <properties>
  <project.build.sourceencoding>utf-8</project.build.sourceencoding>
  <project.reporting.outputencoding>utf-8</project.reporting.outputencoding>
  <java.version>1.8</java.version>
 </properties>

 <dependencies>
  <dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-starter-data-jpa</artifactid>
  </dependency>
  <dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-starter-web</artifactid>
  </dependency>

  <dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-devtools</artifactid>
   <scope>runtime</scope>
  </dependency>
  <dependency>
   <groupid>mysql</groupid>
   <artifactid>mysql-connector-java</artifactid>
   <scope>runtime</scope>
  </dependency>
  <dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-starter-test</artifactid>
   <scope>test</scope>
  </dependency>
  <dependency>
   <groupid>com.alibaba</groupid>
   <artifactid>druid</artifactid>
   <version>1.0.28</version>
  </dependency>
 </dependencies>

 <build>
  <plugins>
   <plugin>
    <groupid>org.springframework.boot</groupid>
    <artifactid>spring-boot-maven-plugin</artifactid>
   </plugin>
  </plugins>
 </build>
</project>

application.properties上半段和整合jpa一点没变，下面加入了一些druid的配置，如果对druid的配置有什么不理解的，可以去网上查一下。（这篇文章我觉得写的很好，传送门）

#端口号
server.port=8888

##validate 加载hibernate时，验证创建数据库表结构
##create 每次加载hibernate，重新创建数据库表结构，这就是导致数据库表数据丢失的原因。
##create-drop  加载hibernate时创建，退出是删除表结构
##update     加载hibernate自动更新数据库结构
##validate 启动时验证表的结构，不会创建表
##none 启动时不做任何操作
spring.jpa.hibernate.ddl-auto=create

##控制台打印sql
spring.jpa.show-sql=true

##数据库配置
##数据库地址
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterencoding=utf8&usessl=false
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=root
##数据库驱动
spring.datasource.driver-class-name=com.mysql.jdbc.driver


#这里是不同的
#使用druid的话 需要多配置一个属性spring.datasource.type
spring.datasource.type=com.alibaba.druid.pool.druiddatasource


# 连接池的配置信息
# 初始化大小，最小，最大
spring.datasource.initialsize=5
spring.datasource.minidle=5
spring.datasource.maxactive=20
# 配置获取连接等待超时的时间
spring.datasource.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
spring.datasource.timebetweenevictionrunsmillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minevictableidletimemillis=300000
spring.datasource.validationquery=select 1 from dual
spring.datasource.testwhileidle=true
spring.datasource.testonborrow=false
spring.datasource.testonreturn=false
# 打开pscache，并且指定每个连接上pscache的大小
spring.datasource.poolpreparedstatements=true
spring.datasource.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

然后在项目中加入druidconfig，简单讲解一下，这个配置文件主要是加载application.properties的配置，代码如下：

package com.dalaoyang.config;
import java.sql.sqlexception;
import javax.sql.datasource;
import org.apache.log4j.logger;
import org.springframework.beans.factory.annotation.value;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;
import org.springframework.context.annotation.primary;
import com.alibaba.druid.pool.druiddatasource;
/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.config
 * @email [e-mail]
 * @date 2018/4/12
 */
@configuration
public class druidconfig {
 private logger logger = logger.getlogger(this.getclass());

 @value("${spring.datasource.url}")
 private string dburl;

 @value("${spring.datasource.username}")
 private string username;

 @value("${spring.datasource.password}")
 private string password;

 @value("${spring.datasource.driver-class-name}")
 private string driverclassname;

 @value("${spring.datasource.initialsize}")
 private int initialsize;

 @value("${spring.datasource.minidle}")
 private int minidle;

 @value("${spring.datasource.maxactive}")
 private int maxactive;

 @value("${spring.datasource.maxwait}")
 private int maxwait;

 @value("${spring.datasource.timebetweenevictionrunsmillis}")
 private int timebetweenevictionrunsmillis;

 @value("${spring.datasource.minevictableidletimemillis}")
 private int minevictableidletimemillis;

 @value("${spring.datasource.validationquery}")
 private string validationquery;

 @value("${spring.datasource.testwhileidle}")
 private boolean testwhileidle;

 @value("${spring.datasource.testonborrow}")
 private boolean testonborrow;

 @value("${spring.datasource.testonreturn}")
 private boolean testonreturn;

 @value("${spring.datasource.poolpreparedstatements}")
 private boolean poolpreparedstatements;

 @value("${spring.datasource.maxpoolpreparedstatementperconnectionsize}")
 private int maxpoolpreparedstatementperconnectionsize;

 @value("${spring.datasource.filters}")
 private string filters;

 @value("{spring.datasource.connectionproperties}")
 private string connectionproperties;

 @bean
 @primary //主数据源
 public datasource datasource(){
  druiddatasource datasource = new druiddatasource();
  datasource.seturl(this.dburl);
  datasource.setusername(username);
  datasource.setpassword(password);
  datasource.setdriverclassname(driverclassname);
  //configuration
  datasource.setinitialsize(initialsize);
  datasource.setminidle(minidle);
  datasource.setmaxactive(maxactive);
  datasource.setmaxwait(maxwait);
  datasource.settimebetweenevictionrunsmillis(timebetweenevictionrunsmillis);
  datasource.setminevictableidletimemillis(minevictableidletimemillis);
  datasource.setvalidationquery(validationquery);
  datasource.settestwhileidle(testwhileidle);
  datasource.settestonborrow(testonborrow);
  datasource.settestonreturn(testonreturn);
  datasource.setpoolpreparedstatements(poolpreparedstatements);
  datasource.setmaxpoolpreparedstatementperconnectionsize(maxpoolpreparedstatementperconnectionsize);
  try {
   datasource.setfilters(filters);
  } catch (sqlexception e) {
   logger.error("druid configuration exception", e);
  }
  datasource.setconnectionproperties(connectionproperties);
  return datasource;
 }
}

然后创建druidfilter，代码如下：

package com.dalaoyang.filter;
import javax.servlet.annotation.webfilter;
import javax.servlet.annotation.webinitparam;
import com.alibaba.druid.support.http.webstatfilter;
/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.filter
 * @email [e-mail]
 * @date 2018/4/12
 */
@webfilter(filtername="druidwebstatfilter",urlpatterns="/*",
  initparams={
    @webinitparam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源
  }
)
public class druidfilter extends webstatfilter {
}

新建druidservlet，在类上面加注解@webservlet，其中配置了登录druid监控页面的账号密码，白名单黑名单之类的配置，代码如下：

package com.dalaoyang.servlet;
import javax.servlet.annotation.webinitparam;
import javax.servlet.annotation.webservlet;
import com.alibaba.druid.support.http.statviewservlet;
/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.servlet
 * @email [e-mail]
 * @date 2018/4/12
 */
@webservlet(urlpatterns="/druid/*",
  initparams={
    @webinitparam(name="allow",value=""),// ip白名单(没有配置或者为空，则允许所有访问)
    @webinitparam(name="deny",value=""),// ip黑名单 (deny优先于allow)
    @webinitparam(name="loginusername",value="admin"),// 登录druid管理页面用户名
    @webinitparam(name="loginpassword",value="admin")// 登录druid管理页面密码
  })
public class druidservlet extends statviewservlet {

}

然后在启动类加入注解@servletcomponentscan，让项目扫描到servlet，代码如下：

package com.dalaoyang;
import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;
import org.springframework.boot.web.servlet.servletcomponentscan;
@springbootapplication
// 启动类必须加入@servletcomponentscan注解，否则无法扫描到servlet
@servletcomponentscan
public class springbootdruidapplication {
 public static void main(string[] args) {
  springapplication.run(springbootdruidapplication.class, args);
 }
}

剩余的就是和整合jpa一样的entity（实体类），repository（数据操作层），controller（测试使用的controller），直接展示代码。

city

package com.dalaoyang.entity;
import javax.persistence.*;
/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email [e-mail]
 * @date 2018/4/7
 */
@entity
@table(name="city")
public class city {
 @id
 @generatedvalue(strategy=generationtype.auto)
 private int cityid;
 private string cityname;
 private string cityintroduce;

 public city(int cityid, string cityname, string cityintroduce) {
  this.cityid = cityid;
  this.cityname = cityname;
  this.cityintroduce = cityintroduce;
 }

 public city(string cityname, string cityintroduce) {
  this.cityname = cityname;
  this.cityintroduce = cityintroduce;
 }

 public city() {
 }

 public int getcityid() {
  return cityid;
 }

 public void setcityid(int cityid) {
  this.cityid = cityid;
 }

 public string getcityname() {
  return cityname;
 }

 public void setcityname(string cityname) {
  this.cityname = cityname;
 }

 public string getcityintroduce() {
  return cityintroduce;
 }

 public void setcityintroduce(string cityintroduce) {
  this.cityintroduce = cityintroduce;
 }
}

cityrepository

package com.dalaoyang.repository;
import com.dalaoyang.entity.city;
import org.springframework.data.jpa.repository.jparepository;

/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.repository
 * @email [e-mail]
 * @date 2018/4/7
 */
public interface cityrepository extends jparepository<city,integer> {
}

citycontroller

package com.dalaoyang.controller;
import com.dalaoyang.entity.city;
import com.dalaoyang.repository.cityrepository;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.web.bind.annotation.getmapping;
import org.springframework.web.bind.annotation.restcontroller;
/**
 * @author dalaoyang
 * @description
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email [e-mail]
 * @date 2018/4/7
 */
@restcontroller
public class citycontroller {
 @autowired
 private cityrepository cityrepository;

 //http://localhost:8888/savecity?cityname=北京&cityintroduce=中国首都
 @getmapping(value = "savecity")
 public string savecity(string cityname,string cityintroduce){
  city city = new city(cityname,cityintroduce);
  cityrepository.save(city);
  return "success";
 }

 //http://localhost:8888/deletecity?cityid=2
 @getmapping(value = "deletecity")
 public string deletecity(int cityid){
  cityrepository.delete(cityid);
  return "success";
 }

 //http://localhost:8888/updatecity?cityid=3&cityname=沈阳&cityintroduce=辽宁省省会
 @getmapping(value = "updatecity")
 public string updatecity(int cityid,string cityname,string cityintroduce){
  city city = new city(cityid,cityname,cityintroduce);
  cityrepository.save(city);
  return "success";
 }
 //http://localhost:8888/getcitybyid?cityid=3
 @getmapping(value = "getcitybyid")
 public city getcitybyid(int cityid){
  city city = cityrepository.findone(cityid);
  return city;
 }
}

然后启动项目，可以看到控制台已经创建了city表。

然后访问http://localhost:8888/druid，可以看到如下图：

输入账号密码admin，admin，如下图

然后这时我们可以访问http://localhost:8888/savecity?cityname=北京&cityintroduce=中国首都

然后点击导航上面的sql监控，如下图，

从上图可以看到启动项目创建表的sql已经刚刚执行的sql。到这里整合已经完成了。

源码下载 ：https://gitee.com/dalaoyang/springboot_learn

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://juejin.im/post/5aceec94f265da2395315d68