Spring 实战 - 整合Druid

• 环境： MacOS + IntelliJ IDEA 2019.3.1 (Ultimate Edition)

基于Spring实战 - 整合Spring MVC，整合Druid

1、在pom.xml中新增com.alibaba:druid 和 mysql:mysql-connector-java 依赖

<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql-connector-java.version}</version>
    </dependency>

2、在resources 目录下创建cats.properties

# Mysql 7
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://${localhost}/${db_name}?useUnicode=true&characterEncoding=utf-8&useSSL=false
jdbc.username=${db_username}
jdbc.password=${db_password}

# JDBC Pool
jdbc.pool.init=1
jdbc.pool.minIdle=3
jdbc.pool.maxActive=20

3、集成Druid
在resources 目录下创建spring-context-druid.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

  <!-- 加载配置属性文件 -->
  <context:property-placeholder ignore-unresolvable="true" location="classpath:cats.properties"/>

  <!-- 数据源配置, 使用 Druid 数据库连接池 -->
  <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
    <!-- 数据源驱动类可不写，Druid默认会自动根据URL识别DriverClass -->
    <property name="driverClassName" value="${jdbc.driverClass}"/>

    <!-- 基本属性 url、user、password -->
    <property name="url" value="${jdbc.connectionURL}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>

    <!-- 配置初始化大小、最小、最大 -->
    <property name="initialSize" value="${jdbc.pool.init}"/>
    <property name="minIdle" value="${jdbc.pool.minIdle}"/>
    <property name="maxActive" value="${jdbc.pool.maxActive}"/>

    <!-- 配置获取连接等待超时的时间 -->
    <property name="maxWait" value="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 -->
    <property name="timeBetweenEvictionRunsMillis" value="60000"/>

    <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
    <property name="minEvictableIdleTimeMillis" value="300000"/>

    <property name="validationQuery" value="${jdbc.testSql}"/>
    <property name="testWhileIdle" value="true"/>
    <property name="testOnBorrow" value="false"/>
    <property name="testOnReturn" value="false"/>

    <!-- 配置监控统计拦截的filters -->
    <property name="filters" value="stat"/>
  </bean>
</beans>

4、在web.xml 配置Druid 监控中心

  <servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>DruidStatView</servlet-name>
    <url-pattern>/druid/*</url-pattern>
  </servlet-mapping>

5、打开浏览器，输入http://localhost:8080/druid/index.html即可查看监控信息