idea运行Tomcat出现 Address localhost:8080 is already in useAddress localhost:8080 is already in use

使用IDEA运行 tomcat时出现 Address localhost:8080 is already in use，就很奇怪，我明明只有这一个程序呀，怎么还会被占用。后来想想可能就是被其他进程占用 ...