从命令行执行Java [英] Execute Java from command line

问题描述

我在桌面上有一个名为Stuff的文件夹，在该文件夹中有以下内容：

• Hello.java
• 
  
• mail.jar

Hello.java从mail.jar导入，因此我需要告诉Hello.java来寻找mail.jar。

从Windows命令行和unix命令行，我如何编译并运行这个？

解决方案

编译：

  javac -cp 。; mail.jar Hello.java 
  

其中; 用于Windows;

并运行：

  java -cp;; mail.jar您好
  

再次，对于Windows，使用; ，对于* nix使用：。

-cp 告诉 javac 和 java classpath 以使用，并且由于您的文件位于执行命令的本地目录中，因此您可以使用。作为Hello部分， jar内的路径的jar名称。维基百科有关于类路径的体面文章。

提醒你，如果你打算定期这样做，你可能需要设置 CLASSPATH 环境变量，而不是一直使用 -cp 标志。 java 和 javac 使用 CLASSPATH p>

对于我自己的开发机器，我实际上在我的 CLASSPATH 。 c>变量。这不是我会在生产或构建/测试盒，但它是非常方便的开发目的。你也想要你的常用罐子。

I have a folder on my desktop titled "Stuff" and in that folder I have the following:

• Hello.java
• mail.jar

And Hello.java imports from mail.jar, so I need to tell Hello.java to look for mail.jar.

From a Windows command line and from a unix command line, how can I compile this and run this?

解决方案

Compile:

javac -cp .;mail.jar Hello.java

where ; is for Windows; use : for *nix.

and run:

java -cp .;mail.jar Hello

where again, use ; for Windows and : for *nix.

-cp tells both javac and java what classpath to use, and as your files are in the local directory where you're executing the command, you can use . for the Hello part and the name of the jar for the paths inside the jar. Wikipedia has a decent article on classpaths.

Mind you, if you're going to be doing this on a regular basis, you may want to set your CLASSPATH environment variable rather than constantly using the -cp flag. Both java and javac use the CLASSPATH variable.

For my own development machine, I actually include . in my CLASSPATH variable, for convenience. It's not something I would do on a production or build/test box, but it's very handy for development purposes. You'd want to have your usual jars in it as well.

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