第二次运行SpringBoot的HelloWorld项目时时出现了一下这个这个问题
8080端口号被占用，网上找到一个在cmd下杀死占用该端口的进程，没看到效果，后来干脆在application.properties配置文件中启用另一个端口号 server.port = 8888 再次运行即可。
后续发现，其实每次项目运行完后关掉它就好了，就不会出现端口被占用的情况了。
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