Java:如何从命令行导入jar文件

I'm trying to call a class (main method) from command line (Windows) with Java.
The class imports other classes (other jars).

我试图用Java从命令行(Windows)调用一个类(主方法)。该类导入其他类(其他jar)。

I always get "class not found exception" from a class that my main program imports.

在我的主要程序导入的类中，我总是得到“类没有发现异常”。

Here's what I tried:

这就是我试着:

Add a CLASSPATH env. var with the path where the referenced lib resides (not working)

添加一个类路径env。使用被引用的lib所在的路径(不工作)
I tried with all these different parameters when calling "java -jar myjar.jar" from command line : "-classpath lib/", "-classpath ./lib/", "-classpath lib", "-cp lib/*", "-cp lib/\*", "-classpath lib/referenced-class.jar", "-classpath ./lib/referenced-class.jar" (lib is where the referenced jar resides)

我在调用“java -jar myjar”时尝试了所有这些不同的参数。jar"来自命令行:"-classpath lib/"， "-classpath lib ./lib/"， "-classpath lib/*"， "-cp lib/\*"， "-classpath lib/referenced-class。jar”、“类路径。/ lib / referenced-class。jar (lib是引用的jar所在的地方)
I tried packaging all the referenced jar inside my jar where my main class resides...

我尝试将所有引用的jar打包到我的主类所在的jar中……
And with all that, I also tried to specify the classes inside the Manifest file with: Class-path referenced-jar.jar and I also tried Class-path lib/referenced-jar.jar

尽管如此，我还尝试使用:Class-path referenced-jar来指定清单文件中的类。jar和我还尝试了Class-path lib/referenced-jar.jar。

4 个解决方案

#1

116

You could run it without the -jar command line argument if you happen to know the name of the main class you wish to run:

如果您碰巧知道要运行的主类的名称，那么可以不使用-jar命令行参数来运行它:

java -classpath .;myjar.jar;lib/referenced-class.jar my.package.MainClass

If perchance you are using linux, you should use ":" instead of ";" in the classpath.

如果您可能正在使用linux，您应该在类路径中使用“:”而不是“;”。

#2

If you're running a jar file with java -jar, the -classpath argument is ignored. You need to set the classpath in the manifest file of your jar, like so:

如果使用java -jar运行jar文件，则忽略-classpath参数。您需要在jar的manifest文件中设置类路径，如下所示:

Class-Path: jar1-name jar2-name directory-name/jar3-name

- path:jar1-name jar2-name目录名/ jar3-name

See the Java tutorials: Adding Classes to the JAR File's Classpath.

请参阅Java教程:向JAR文件的类路径添加类。

Edit: I see you already tried setting the class path in the manifest, but are you sure you used the correct syntax? If you skip the ':' after "Class-Path" like you showed, it would not work.

编辑:我看到您已经尝试在清单中设置类路径，但是您确定您使用了正确的语法吗?如果你跳过“类路径”之后的“:”，它就不会工作。

#3

try

试一试

java -cp "your_jar.jar:lib/referenced_jar.jar" com.your.main.Main

If you are on windows, you should use ; instead of :

如果你在windows上，你应该使用;而不是:

#4

you can try to export as "Runnable jar" in eclipse. I have also problems, when i export as "jar", but i have never problems when i export as "Runnable jar".

您可以尝试在eclipse中导出为“Runnable jar”。我也有问题，当我导出为“jar”时，但是当我导出为“Runnable jar”时，我从来没有问题。

#1

116