SpringBoot整合Druid数据源

一、添加依赖

		<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.21</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

二、配置

spring:
  datasource:
    username: root
    password: mysql
    #假如时区报错，就添加一个时区的配置: serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&serverTimezone=UTC&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
    #druid 数据源专有配置
    #初始化大小
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
    #如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #则导入 log4j 依赖即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

三、编写配置类

package com.example.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
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;

import javax.sql.DataSource;
import java.util.HashMap;

/**
 * Druid配置类
 * @author 桃味果仁
 */
@Configuration
public class DruidConfig {

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

    /**
     * 访问监控后台页面的地址url：localhost:8080/druid/sql.html
     * 配置后台监控
     * @return
     */
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<StatViewServlet> statViewServletServletRegistrationBean = new ServletRegistrationBean<>(
                new StatViewServlet(),
                "/druid/*");

        //配置初始化参数
        HashMap<String, String> initParameters = new HashMap<>();

        //设置登录账户和密码
        //key的值是固定的
        initParameters.put("loginUsername","admin");
        initParameters.put("loginPassword","admin123");

        //允许谁可以访问
        //initParameters.put("allow","");

        //禁止谁可以访问
       // initParameters.put("mingzi","192.168.0.1");

        statViewServletServletRegistrationBean.setInitParameters(initParameters);
        return statViewServletServletRegistrationBean;
    }

    /**
     * 配置过滤器
     * @return
     */
    @Bean
    public FilterRegistrationBean webStatFilter(){

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());

        HashMap<String, String> initParameters = new HashMap<>();
        //以下内容不进行统计
        initParameters.put("exclusions","*.js,*.css,/druid/*");

        filterRegistrationBean.setInitParameters(initParameters);
        return filterRegistrationBean;
    }
}

四、注意

需要在resource下面创建一个log4j.properties配置文件，并填写以下配置：

log4j.rootLogger=DEBUG, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

否则会出现以下错误：
log4j:WARN No appenders could be found for logger (druid.sql.Connection))