如何使用以下命令行在UNIX中执行jar文件：java -jar mysolution.jar

I tried to use the below command line to execute jar file, but whatever follow the "<" had been omit. I have tried to find the solution on the internet, but no luck. Can you please help me?

我尝试使用下面的命令行来执行jar文件,但是“<”之后的任何内容都被省略了。我试图在互联网上找到解决方案,但没有运气。你能帮我么?

How can I execute jar file in UNIX-like using this command line:

如何使用此命令行在UNIX中执行jar文件:

java -jar mysolution.jar < inputfile.txt

Thanks

1 个解决方案

#1

Assuming mysolution.jar contains a main method like this:

假设mysolution.jar包含这样的main方法:

public static void main(String[] args) {
    ...
}

Anything after mysolution.jar in your command will be filled into the args String array. So if you run this:

在命令中的mysolution.jar之后的任何内容都将填充到args String数组中。所以,如果你运行这个:

java -jar mysolution.jar inputfile.txt

Then in your main method args will be an array of length 1, whose only value is the String inputfile.txt.

然后在你的main方法中,args将是一个长度为1的数组,其唯一值是String inputfile.txt。

You will then have to write the code that opens that file and does something with it.

然后,您必须编写打开该文件的代码并对其执行某些操作。

Your original approach would replace stdin with a file stream coming from that file. To work with the file that way you would have to use a Scanner

您的原始方法将使用来自该文件的文件流替换stdin。要以这种方式使用文件,您必须使用扫描仪

Here's another question/answer with some details on reading a file via stdin

这是关于通过stdin读取文件的一些细节的另一个问题/答案

#1