第二次運行SpringBoot的HelloWorld項目時時出現了一下這個這個問題
8080端口號被占用，網上找到一個在cmd下殺死占用該端口的進程，沒看到效果，后來干脆在application.properties配置文件中啟用另一個端口號 server.port = 8888 再次運行即可。
后續發現，其實每次項目運行完后關掉它就好了，就不會出現端口被占用的情況了。
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