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：

 4.0.0

 com.dalaoyang
 springboot_druid
 0.0.1-SNAPSHOT
 jar

 springboot_druid
 springboot_druid

 
  org.springframework.boot
  spring-boot-starter-parent
  1.5.12.RELEASE
   
 

 
  UTF-8
  UTF-8
  1.8
 

 
  
   org.springframework.boot
   spring-boot-starter-data-jpa
  
  
   org.springframework.boot
   spring-boot-starter-web
  

  
   org.springframework.boot
   spring-boot-devtools
   runtime
  
  
   mysql
   mysql-connector-java
   runtime
  
  
   org.springframework.boot
   spring-boot-starter-test
   test
  
  
   com.alibaba
   druid
   1.0.28
  
 

 
  
   
    org.springframework.boot
    spring-boot-maven-plugin
   
  
 

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;

@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;

@WebFilter(filterName="druidWebStatFilter",urlPatterns="
@WebServlet(urlPatterns="/druid
@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;


public interface CityRepository extends JpaRepository {
}

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;

@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考高分网。