druid-spring-boot-starter初体验

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背景

druid是阿里巴巴开源的一款数据库连接池,能够提供强大的监控和扩展功能。

初体验

pom依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.21</version>
        </dependency>

配置

必要配置

指定数据源类型为DruidDataSource

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource // druid自带配置
spring.datasource.url=jdbc:mysql://localhost:3306/table?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=username
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

数据库监控

# druid配置
spring.datasource.druid.web-stat-filter.enabled=true

spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.login-username=note
spring.datasource.druid.stat-view-servlet.login-password=abeffect

打开链接:http://localhost:8080/druid/index.html

可以查看监控。

注意:自带的监控页面有广告,可以用后面的方法去广告

慢SQL监控

#是否开启慢sql查询监控  
spring.datasource.druid.filter.stat.log-slow-sql=true  
  
#慢SQL执行时间  
spring.datasource.druid.filter.stat.slow-sql-millis=1  

去广告

根据参考二中的方法,编写一个RemoveDruidAdConfig,如下:


import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure;
import com.alibaba.druid.spring.boot.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;

/**
 * 类名称:RemoveDruidAdConfig 类描述: 去除druid底部的广告配置类
 * <p>
 * Version 1.0
 */

@Configuration
@ConditionalOnWebApplication
@AutoConfigureAfter(DruidDataSourceAutoConfigure.class)
@ConditionalOnProperty(name = "spring.datasource.druid.stat-view-servlet.enabled", havingValue = "true",
    matchIfMissing = true)
public class RemoveDruidAdConfig {

    /**
     * 方法名: removeDruidAdFilterRegistrationBean 方法描述:  除去页面底部的广告
     *
     * @param properties
     * @return org.springframework.boot.web.servlet.FilterRegistrationBean
     * @throws
     */
    @Bean
    public FilterRegistrationBean removeDruidAdFilterRegistrationBean(DruidStatProperties properties) {
        // 获取web监控页面的参数
        DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
        // 提取common.js的配置路径
        String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
        String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");

        final String filePath = "support/http/resources/js/common.js";

        //创建filter进行过滤
        Filter filter = new Filter() {
            @Override
            public void init(FilterConfig filterConfig) throws ServletException {
            }

            @Override
            public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws
                IOException, ServletException {
                chain.doFilter(request, response);
                // 重置缓冲区,响应头不会被重置
                response.resetBuffer();
                // 获取common.js
                String text = Utils.readFromResource(filePath);
                // 正则替换banner, 除去底部的广告信息
                text = text.replaceAll("<a.*?banner\"></a><br/>", "");
                text = text.replaceAll("powered.*?shrek.wang</a>", "");
                response.getWriter().write(text);
            }

            @Override
            public void destroy() {
            }
        };
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(filter);
        registrationBean.addUrlPatterns(commonJsPattern);
        return registrationBean;
    }
}

参考