springcloud框架搭建（四）Druid(數據庫連接池)

都說Druid是Java中最好的數據庫連接池，提供了強大的監控和擴展功能。

Maven中添加

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.0</version>
</dependency>

然後application.yml配置：

eureka:
  client:
    service-url:
      defaultZone: http://zmq:123456@localhost:1111/eureka/
server:
  port: 1112
spring:
  application:
    name: producer
  datasource:
    #基本配置
    url: jdbc:mysql://localhost:3306/damo?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
    driver-class-name: com.mysql.cj.jdbc.Driver
    username: root
    password: root
    type: com.alibaba.druid.pool.DruidDataSource
    #其他配置
    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
    #  配置監控統計攔截的filters，去掉後監控界面sql無法統計，'wall'用於防火牆
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.example.producer.model
  configuration:
    map-underscore-to-camel-case: true
feign:
  hystrix:
    enabled: true

自定義配置文件DruidConfig 類：

package com.example.producer.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.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author Return
 * @create 2019/4/28 11:14
 */
//配置druid數據源配置以及數據源監控
@Configuration
public class DruidConfig {

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

    @Bean
    public ServletRegistrationBean statViewServlet(){
       
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String,String> initParams=new HashMap<String,String>();
        initParams.put("loginUsername","admin");
        initParams.put("loginPassword","admin");
        initParams.put("allow","");
       // initParams.put("deny","xxx.xxx.xxx.xxx");
        bean.setInitParameters(initParams);
        return bean;
    }

    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        bean.setUrlPatterns(Arrays.asList("/*"));

        return  bean;
    }
}

然後啓動報錯：

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'spring.datasource' to javax.sql.DataSource:

    Property: spring.datasource.filters
    Value: stat,wall,log4j
    Origin: class path resource [application.yml]:30:14
    Reason: org.apache.log4j.Logger

Action:

Update your application's configuration


Process finished with exit code 1

Reason: org.apache.log4j.Logger  猜測可能是缺少包，加上下面的包：

<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>

啓動沒問題，然後測試是否監控成功，

http://localhost:1112/druid

收工！