阿里巴巴Druid數據庫連接池的使用

准備：

　　創建一個基於SpringBoot的web項目

 

1 引入相關依賴

　　jpa、mysql、druid

　　　　

<?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>cn.xiangxu</groupId>
    <artifactId>qcbx</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>qcbx</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.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-web</artifactId>
        </dependency>

        <!--數據庫相關-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

 

2 配置數據庫連接信息

　　

server: # 服務配置
  port: 80
#  context-path: /dev
spring:
  datasource: # 數據庫連接池配置
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/springdemo?useUnicode=true&characterEncoding=UTF-8
    username: root
    password: asdf

    type: com.alibaba.druid.pool.DruidDataSource
    #配置監控統計攔截的filters，去掉后監控界面sql將無法統計,'wall'用於防火牆
    filters: stat, wall, log4j
    #最大活躍數
    maxActive: 20
    #初始化數量
    initialSize: 1
    #最大連接等待超時時間
    maxWait: 60000
    #打開PSCache，並且指定每個連接PSCache的大小
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
    #通過connectionProperties屬性來打開mergeSql功能；慢SQL記錄
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    minIdle: 1
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: select 1 from dual
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
#    filters: stat

  jpa: # jpa配置
    hibernate:
#      ddl-auto: create # 會在首次啟動的時候根據相應的實體類在數據庫中創建相應的表，如果之前有表了，就會刪掉在重建
#      ddl-auto: update # 如果沒有表會創建，有表會對表結構進行修改
#     ddl-auto:create-drop # 應用停下來時會將表刪掉
      ddl-auto: none  # 什么都不做（默認值）
#      ddl-auto: validate # 檢查實體類字段和表字段是否一致，如果不一致就會報錯
    show-sql: true # 執行數據庫操作時會打印出相應的SQL語句

#  mvc:
#    view: # jsp文件路徑設置
#      prefix: /WEB-INF/jsp/ # jsp視圖前綴
#      suffix: .jsp # jsp視圖后綴

  http:
    multipart: # 上傳文件大小設置
      max-file-size: 1024Mb # 設置最大上傳大小
      max-request-size: 2048Mb # 設置最大請求大小

#  redis: # rediss緩存設置
#    host: 127.0.0.1 # 監聽IP地址
#    port: 6379 # 端口號
#    pool:
#      max-idle: 20
#      min-idle: 1
#      max-active: 20
#      max-wait: 60000
#    database: 0

logging: # 日志配置
  level:
#    cn.xiangxu.spring.controller.logger: 'off' # 屏蔽掉相應包的日志控制台輸出和日記文件保存

 

3 配置druid

package cn.xiangxu.qcbx.configuration;

import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
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;

/**
 * Druid配置
 */
@Configuration
public class DruidConfiguration {
    @Bean
    public ServletRegistrationBean statViewServlet(){
        //創建servlet注冊實體
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        //設置ip白名單
        servletRegistrationBean.addInitParameter("allow","127.0.0.1");
        //設置ip黑名單，如果allow與deny共同存在時,deny優先於allow
        servletRegistrationBean.addInitParameter("deny","192.168.0.19");
        //設置控制台管理用戶
        servletRegistrationBean.addInitParameter("loginUsername","wys");
        servletRegistrationBean.addInitParameter("loginPassword","123456");
        //是否可以重置數據
        servletRegistrationBean.addInitParameter("resetEnable","false");
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean statFilter(){
        //創建過濾器
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        //設置過濾器過濾路徑
        filterRegistrationBean.addUrlPatterns("/*");
        //忽略過濾的形式
        filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

 

4 啟動成功效果