SpringBoot专栏(四) -- SpringBoot+MyBatis集成Druid连接池

解决问题：

SpringBoot2.0+MyBatis框架集成阿里Druid连接池？

本章基于SpringBoot专栏(三) -- SpingBoot集成MyBatis框架的代码。

1.在pom.xml文件中导入Jar包。

pom.xml

<?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.mungerz</groupId>
    <artifactId>FirstSpringBootDemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>

</project>

2.修改SpringBoot配置文件，application.xml

spring:
  profiles:
    active: dev

  #配置数据源
  datasource:
    url: jdbc:mysql://192.168.43.167:3306/mungerTest01
    username: root
    password: Munger_123
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 300
    minIdle: 100
    maxActive: 1000
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 30000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    #exceptionSorter: true
    testOnReturn: false
    poolPreparedStatements: true
    #filter: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
    useGlobalDataSourceStat: true

mybatis:
  typeAliasesPackage: com.mungerz.dao
  mapperLocations: classpath:mapper/*.xml

关键配置：

#Druid连接池，初始化时创建的连接数

initialSize: 300 Druid连接池

#Druid连接池，空闲时，连接池中保留的最小连接数

minIdle: 100

#Druid连接池，最大活跃连接数

maxActive: 1000

 (配置信息参考官网：https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE)

3.SpringBoot注入Druid连接池

创建如下文件：

DruidStatFilter.java

package com.mungerz.filter;

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

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

@WebFilter(filterName="druidWebStatFilter",
        urlPatterns="/*",
        initParams={
                @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"),// 忽略资源
        })
public class DruidStatFilter extends WebStatFilter {
}

DruidStatViewServlet.java

package com.mungerz.filter;

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

import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;

@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="192.168.16.11"),// IP黑名单 (存在共同时，deny优先于allow)
        @WebInitParam(name="loginUsername",value="admin"),// 用户名
        @WebInitParam(name="loginPassword",value="admin"),// 密码
        @WebInitParam(name="resetEnable",value="true")// 禁用HTML页面上的“Reset All”功能
})
public class DruidStatViewServlet extends StatViewServlet {
    private static final long serialVersionUID = 2359758657306626394L;
}

Application.java

package com.mungerz;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;

// SpringBootApplication注解：负责启动SpringBoot项目。这个注解实现了扫描包的功能，扫描范围是该文件所在的当前目录和同级目录。
// 我们需要格外注意这个注解所在文件的位置，因为它和扫包有关系。什么是扫包？就是发现Service,Controller,Component然后自动注入到Spring容器中。
@SpringBootApplication
@ServletComponentScan
public class Application {
    public static void main(String[] args){
        SpringApplication.run(Application.class, args);
    }

    @Bean("druidDataSource")
    @ConfigurationProperties(prefix="spring.datasource")
    public DataSource druidDataSource() { return new DruidDataSource(); }
}

这样，Druid连接池就集成成功了。直接运行项目，会找到如下日志：

4.登录Druid监控界面

项目运行成功以后，在浏览器地址输入：http://localhost:8080/druid/login.html 

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