“No X11 DISPLAY variable was set”问题的解决过程

1.之前在windows上验证，截屏功能很正常，于是部署到linux上2.运行后，报“No X11 DISPLAY variable was set, but this program performed an operation which requires it. ”的错误。是HeadlessToolkit.getScreenSize（）这个函数3.百度了下，原因大概知道了。主要是