问题: springboot java Web server failed to start. Port 8080 was already in use如何关闭占用端口|java web后台开发|在线助手-您的在线生成制作工具箱!

问题关键字: springboot，java web后台开发，8080端口占用，在线生成制作工具，在线助手!

问题详细描述: springboot java Web server failed to start. Port 8080 was already in use如何关闭占用端口的解决方案是在线助手博客-您的在线生成制作工具箱，系列文章之一，主要记录了springboot java Web server failed to start. Port 8080 was already in use如何关闭被占用的8080端口的问题。!

springboot java Web server failed to start. Port 8080 was already in use如何关闭占用端口

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####一、Port 8080 was already in use一般是断开被占用，如果是mac系统参照
[mac启动springboot失败，8080端口被占用，mac命令行关闭端口](https://www.it399.com/blog/web/201805251638)
####idea springboot 启动失败，8080端口被占用
```java
Identify and stop the process that's listening on port 8020 or configure this application to listen on another port.
```
####二、widows系统解决办法：查找占用的端口对应的pid
命令行或者idea终端输入netstat -aon|findstr "端口号"，比如我的是8020
```java
netstat -aon|findstr "8020"
```
出现如下信息，可见端口被pid为4292占用了
```java
D:\csy\file\GitEE4\MaYunGeRen\LinuxData\it399_springboot\it399_springboot>netstat -aon|findstr "8020"
  TCP    0.0.0.0:8020           0.0.0.0:0              LISTENING       4292
  TCP    [::]:8020              [::]:0                 LISTENING       4292

```

####三、启动任务管理器，找到进程为4292的，结束进程即可。
**快捷键alt + ctrl + del**
![图片.png](https://upload-images.jianshu.io/upload_images/2704327-538178c5eed5f0ab.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/800)

>转载请注明:本文转载自[在线助手|在线工具](https://www.it399.com/)博客，原文链接:https://www.it399.com/blog/web/201807011841