一、前言
dubbo-monitor主要用来统计服务的调用次调和调用时间的监控中心，服务消费者和提供者，在内存中累计调用次数和调用时间，定时每分钟发送一次统计数据到监控中心，监控中心则使用数据绘制图表来显示。
二、dubbo-monitor-simple的搭建
在服务提供方和消费方需要配置如下：
<dubbo:monitor protocol="registry"/>
protocol为"registry"，表示服务提供方和消费方从注册中心发现监控中心（monitor）地址。下载源码
在 https://github.com/alibaba/dubbo/tree/2.5.x 下载dubbo的源码解压源码，进入dubbo-2.5.x 目录，内容如下:
在该目录执行mvn clean package -Dmaven.test.skip=true会生成如下结果：
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] dubbo-parent ...................................... SUCCESS [2.857s]
[INFO] Hessian Lite(Alibaba embed version) ............... SUCCESS [6.518s]
[INFO] dubbo-common ...................................... SUCCESS [7.706s]
[INFO] dubbo-container ................................... SUCCESS [0.057s]
[INFO] dubbo-container-api ............................... SUCCESS [3.398s]
[INFO] dubbo-container-spring ............................ SUCCESS [1.099s]
[INFO] dubbo-container-jetty ............................. SUCCESS [1.164s]
[INFO] dubbo-container-log4j ............................. SUCCESS [1.196s]
[INFO] dubbo-container-logback ........................... SUCCESS [1.138s]
[INFO] dubbo-remoting .................................... SUCCESS [0.045s]
[INFO] dubbo-remoting-api ................................ SUCCESS [3.615s]
[INFO] dubbo-remoting-netty .............................. SUCCESS [1.959s]
[INFO] dubbo-remoting-mina ............................... SUCCESS [1.602s]
[INFO] dubbo-remoting-grizzly ............................ SUCCESS [1.752s]
[INFO] dubbo-remoting-p2p ................................ SUCCESS [2.148s]
[INFO] dubbo-remoting-http ............................... SUCCESS [2.154s]
[INFO] dubbo-remoting-zookeeper .......................... SUCCESS [2.165s]
[INFO] dubbo-remoting-netty4 ............................. SUCCESS [2.721s]
[INFO] dubbo-rpc ......................................... SUCCESS [0.060s]
[INFO] dubbo-rpc-api ..................................... SUCCESS [3.397s]
[INFO] dubbo-rpc-default ................................. SUCCESS [3.278s]
[INFO] dubbo-rpc-injvm ................................... SUCCESS [1.706s]
[INFO] dubbo-rpc-rmi ..................................... SUCCESS [1.373s]
[INFO] dubbo-rpc-hessian ................................. SUCCESS [1.791s]
[INFO] dubbo-rpc-http .................................... SUCCESS [1.210s]
[INFO] dubbo-rpc-webservice .............................. SUCCESS [1.816s]
[INFO] dubbo-cluster ..................................... SUCCESS [2.690s]
[INFO] dubbo-registry .................................... SUCCESS [0.033s]
[INFO] dubbo-registry-api ................................ SUCCESS [2.548s]
[INFO] dubbo-monitor ..................................... SUCCESS [0.020s]
[INFO] dubbo-monitor-api ................................. SUCCESS [1.309s]
[INFO] dubbo-filter ...................................... SUCCESS [0.023s]
[INFO] dubbo-filter-validation ........................... SUCCESS [1.474s]
[INFO] dubbo-filter-cache ................................ SUCCESS [1.395s]
[INFO] dubbo-registry-default ............................ SUCCESS [1.402s]
[INFO] dubbo-monitor-default ............................. SUCCESS [1.258s]
[INFO] dubbo-registry-multicast .......................... SUCCESS [1.336s]
[INFO] dubbo-config ...................................... SUCCESS [0.018s]
[INFO] dubbo-config-api .................................. SUCCESS [3.498s]
[INFO] dubbo-config-spring ............................... SUCCESS [3.326s]
[INFO] dubbo-rpc-thrift .................................. SUCCESS [2.115s]
[INFO] dubbo-rpc-memcached ............................... SUCCESS [1.476s]
[INFO] dubbo-rpc-redis ................................... SUCCESS [1.367s]
[INFO] dubbo-registry-zookeeper .......................... SUCCESS [1.597s]
[INFO] dubbo-registry-redis .............................. SUCCESS [2.111s]
[INFO] dubbo-plugin ...................................... SUCCESS [0.027s]
[INFO] dubbo-qos ......................................... SUCCESS [2.574s]
[INFO] dubbo ............................................. SUCCESS [2.662s]
[INFO] dubbo-simple ...................................... SUCCESS [0.017s]
[INFO] dubbo-registry-simple ............................. SUCCESS [5.246s]
[INFO] dubbo-monitor-simple .............................. SUCCESS [11.301s]
[INFO] dubbo-admin ....................................... SUCCESS [11.472s]
[INFO] dubbo-demo ........................................ SUCCESS [0.034s]
[INFO] dubbo-demo-api .................................... SUCCESS [1.097s]
[INFO] dubbo-demo-provider ............................... SUCCESS [1.892s]
[INFO] dubbo-demo-consumer ............................... SUCCESS [1.473s]
[INFO] dubbo-test ........................................ SUCCESS [0.022s]
[INFO] dubbo-test-benchmark .............................. SUCCESS [5.324s]
[INFO] dubbo-test-compatibility .......................... SUCCESS [0.017s]
[INFO] dubbo-test-spring3 ................................ SUCCESS [1.719s]
[INFO] dubbo-test-integration ............................ SUCCESS [0.149s]
[INFO] dubbo-test-examples ............................... SUCCESS [3.413s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2:16.562s
[INFO] Finished at: Wed Mar 14 17:19:06 CST 2018
[INFO] Final Memory: 38M/654M
[INFO] ------------------------------------------------------------------------
进入/Users/zhuizhumengxiang/Downloads/dubbo-2.5.x/dubbo-simple/dubbo-monitor-simple/target
目录，会发现生成了dubbo-monitor-simple-2.5.10-assembly.tar.gz：
-
解压dubbo-monitor-simple-2.5.10-assembly.tar.gz,修改进入dubbo-monitor-simple-2.5.10/conf/dubbo.properties：
其中dubbo.registry.address=zookeeper://127.0.0.1:2181设置注册中心地址，这里设置为zk的地址
其中dubbo.protocol.port=7070，为monitor提供的远程服务监听端口，服务提供者和消费者会调用这个端口提供的服务，发送统计信息到monitor
dubbo.charts.directory和dubbo.statistics.directory为monitor本地存放的监控数据文件的位置
dubbo.jetty.port=8081 设置jetty容器的监听地址，类似于tomcat的8080端口，这里设置为8081
-
进入dubbo-monitor-simple-2.5.10/bin,执行sh start.sh启动monitor
image.png
至此monitor启动了访问http://127.0.0.1:8081/ 会出现下面界面：
三、dubbo-monitor-simple的使用
3.1 应用程序查看
3.2 服务查看
3.3 注册中心查看
3.4 调用数据统计
四、总结
dubbo-monitor也不是使用dubbo搭建分布式系统必须的组件，但是它用来统计服务的调用次调和调用时间的监控中心，这些数据有助于系统运维和调优。
欢迎大家加入知识星球，在知识星球里面我们会深入讨论Java并发编程，以及JUC包源码；Java类加载器原理;Spring,Springboot,Tomcat，Dubbo等开源框架的使用以及源码剖析；分享作者从毕业到现在一路走来的学习经验，如何高效学习，如何阅读源码；讨论职业面试时候会经常遇到的问题以及如何作答，读者可以识别下面二维码加入：
