今天maven工程中配置pom.xml时Tomcat配了80端口号，结果提示Address already in use: JVM_Bind:80，也就是80端口被占用，于是就按照往常的惯例去查看是什么进程占用了80端口
1、打开cmd命令窗口，输入netstat -ano | findstr 80，回车就会看见被占用端口号8080所对应的PID为4
然后去任务管理器根据PID找到这个进程，发现是系统进程，所以无法结束
2.在cmd中输入netsh http show servicestate，找到你的服务的PID
然后再去任务管理器窗口的服务下关闭这个服务就OK了，最后发现这个问题是安装了SQL Server 2008 R2的服务导致的，没装过的话应该没什么事。
Address already in use: JVM_Bind:80
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