Druid

Druid：一款为监控而生的数据库连接池框架，整个项目由数据库连接池、插件框架和SQL解析器组成。
Druid功能介于PowerDrill和Dremel之间，它几乎实现了Dremel的所有功能，并且从PowerDrill吸收一些有趣的数据格式。Druid允许以类似Dremel和PowerDrill的方式进行单表查询，同时还增加了一些新特性，如为局部嵌套数据结构提供列式存储格式、为快速过滤做索引、实时摄取和查询、高容错的分布式体系架构等。

Spring Boot

spring框架作为JavaEE框架领域的一款重要的开源框架，在企业应用开发中有着很重要的作用，同时Spring框架及其子框架很多，所以知识量很广。
Spring Boot：一款Spring框架的子框架，也可以叫微框架，是2014年推出的一款使Spring框架开发变得容易的框架。学过Spring框架的都知识，Spring框架难以避免地需要配置不少XMl，而使用Spring Boot框架的话，就可以使用注解开发，极大地简化基于Spring框架的开发。Spring Boot充分利用了JavaConfig的配置模式以及“约定优于配置”的理念，能够极大的简化基于Spring MVC的Web应用和REST服务开发。
然后本博客介绍基于IDEA编辑器的Spring Boot项目创建和部署。

Spring Boot使用Druid监控

maven配置

要配置spring Boot实现一个Demo的话，只要加入spring-boot-starter（核心模块）和spring-boot-starter-web（因为这个一个Web项目），可以参考我的配置，这里使用了Spring Boot热部署，需要去github上搜索jar：springloaded-1.2.4.RELEASE.jar，然后下载放在项目的lib文件夹里，可以参考我的配置

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>demo</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>demo Maven Webapp</name>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <druid.version>1.0.24</druid.version>
    <mysql.version>5.1.27</mysql.version>
    <spring-boot-admin.version>1.4.5</spring-boot-admin.version>
  </properties>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.1.RELEASE</version>
    <relativePath/>
  </parent>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>de.codecentric</groupId>
      <artifactId>spring-boot-admin-starter-client</artifactId>
      <version>${spring-boot-admin.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>

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

  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin </artifactId>
        <dependencies>
          <!--springloaded hot deploy -->
          <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
            <systemPath>${basedir}/src/main/webapp/WEB-INF/lib/springloaded-1.2.5.RELEASE.jar</systemPath>
          </dependency>
        </dependencies>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
            <configuration>
              <classifier>exec</classifier>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

application.properties配置

server.context-path=/springbootdemo

#数据库访问配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/myblog
spring.datasource.username=root
spring.datasource.password=root

#数据源配置，初始化大小、最小、最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
#连接等待超时时间
spring.datasource.maxWait=60000
#配置隔多久进行一次检测(检测可以关闭的空闲连接)
spring.datasource.timeBetweenEvictionRunsMillis=60000
#配置连接在池中的最小生存时间
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，‘wall‘用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

方式一原生的servlet和filter方式

编写Servlet类：

package com.example.web.servlet;

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

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

/**
 * Created by Administrator on 2017/4/28.
 */
@WebServlet(urlPatterns = "/druid/*",
        initParams = {
                @WebInitParam(name = "allow", value = http://www.mamicode.com/"192.168.10.25,127.0.0.1"),// IP白名单 (没有配置或者为空，则允许所有访问)
                @WebInitParam(name = "deny", value = http://www.mamicode.com/"192.168.1.73"),// IP黑名单 (存在共同时，deny优先于allow)
                @WebInitParam(name = "loginUsername", value = http://www.mamicode.com/"admin"),// 用户名
                @WebInitParam(name = "loginPassword", value = http://www.mamicode.com/"123"),// 密码
                @WebInitParam(name = "resetEnable", value = http://www.mamicode.com/"false")// 禁用HTML页面上的“Reset All”功能)
        }
)
public class DruidStatViewServlet extends StatViewServlet{

}

Filter类：

package com.example.web.filter;

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

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

/**
 * Created by Administrator on 2017/4/28.
 */
@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*",
        initParams={
                @WebInitParam(name="exclusions",value=http://www.mamicode.com/"*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")// 忽略资源
        }
)
public class DruidWebStatFilter extends WebStatFilter{

}

然后，需要在Spring Boot启动类里设置Servlet自动扫描，不然会出现404页面找不到错误，使用@ServletComponentScan注解

package com;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.scheduling.annotation.EnableAsync;

@SpringBootApplication
@ServletComponentScan
@EnableAsync
public class Application implements EmbeddedServletContainerCustomizer {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    public void customize(ConfigurableEmbeddedServletContainer configurableEmbeddedServletContainer) {
        configurableEmbeddedServletContainer.setPort(8087);
    }

}

方式二使用代码注册Servlet和Filter

package com.example.config;

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

/**
 * Created by Administrator on 2017/4/28.
 */
@Configuration
public class DruidConfiguration {

    /**
     * 注册ServletRegistrationBean
     * @return
     */
    @Bean
    public ServletRegistrationBean registrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid1/*");
        /** 初始化参数配置，initParams**/
        //白名单
        bean.addInitParameter("allow", "127.0.0.1");
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        bean.addInitParameter("deny", "192.168.1.73");
        //登录查看信息的账号密码.
        bean.addInitParameter("loginUsername", "admin2");
        bean.addInitParameter("loginPassword", "123");
        //是否能够重置数据.
        bean.addInitParameter("resetEnable", "false");
        return bean;
    }

    /**
     * 注册FilterRegistrationBean
     * @return
     */
    @Bean
    public FilterRegistrationBean druidStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        bean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        bean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid2/*");
        return bean;
    }

}

项目监控

然后输入url访问，我的项目访问路径：http://localhost:8087/springbootdemo/druid/login.html，这个需要自己修改，我的Context配置为springbootdemo，端口配置为8087，这些可以参考我上一篇博客

通过平台进行监控