我的Jar是双击还是从命令行启动？ [英] Was my Jar double clicked, or launched from the command line?

问题描述

我的Jar文件支持单击并从命令行启动。

My Jar file supports both being clicked, and launched from the command line.

如果有可用的图形环境，我只会通过检查<$来显示GUI c $ c> GraphicsEnvironment.isHeadless（）

I will only display the GUI if there is a graphics environment available by checking GraphicsEnvironment.isHeadless()

如果用户双击，我希望能够将日志打印到磁盘上的文件jar文件，如果从命令行启动，则将它们打印到控制台。

I would like to be able to print logs to a file on disk if the user double clicks the jar file, and print them to the console if launched from the command line.

我一直无法找到答案，是否存在任何跨平台环境变量，或者我可以看到的任何其他内容，以了解用户是否使用 java -jar app.jar 启动了我的程序，或者他们是否双击了.jar文件？

I have been unable to find an answer to this, are there any cross-platform environment variables, or anything else I can look at to know whether the user launched my program using java -jar app.jar, or whether they double clicked the .jar file?

推荐答案

执行此操作的一种方法是确定控制台何时为空：

One way to do this is to determine when the console is null:

public static void main(String[] args) {
    Console console = System.console();
    if(console!=null){
        System.out.println("Console is not null");
    }else{
        System.out.println("Console is null");
    }
}

尝试使用命令行从命令行运行代码以下命令：

Try to run the code from the command line using the following command:

java -jar [your_runnable_file.jar]

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