如何在 ubuntu 中设置 java 中的类路径以及如何使用 jar？
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How to set the classpath in java in ubuntu and how to work with jar?
提问by Tomonso Ejang
I'm trying to import the class from jar files. I want to place all of the jar files in the directory:
我正在尝试从 jar 文件中导入类。我想将所有 jar 文件放在目录中：
/home/somebody/lib/java/
Compiling with the command given below says:
使用下面给出的命令编译说：
package com.a.A does not exits**. java C.java
包 com.aA 不退出**。java C.java
I set the following in profile.
我在配置文件中设置了以下内容。
CLASSPATH=/home/somebody/lib/java
then exported it. Added to PATHas well
然后导出。加入PATH以及
C.java
C.java
import com.a.A;
import com.a.AA;
import com.b.B;
import com.b.BB;
class B {
public static void main() {
new A();
new AA();
new B();
new BB();
}
}
the classfiles are in the following jar_file a.jarand b.jar.
类文件位于以下 jar_file a.jar和b.jar 中。
回答by Paulo Mattos
You should add your jar filesto your CLASSPATHinstead:
您应该将您的jar 文件添加到您的CLASSPATH：
export CLASSPATH=/home/somebody/lib/java/a.jar:/home/somebody/lib/java/b.jar
The classpath supports directories (with *.classfiles) orindividual jar files. You can also add wildcards(or use java -classpathoption) but I will leave that off for now to don't further complicate things ;)
类路径支持目录（带有*.class文件）或单独的 jar 文件。您还可以添加通配符（或使用java -classpath选项），但我暂时将其搁置，以免使事情进一步复杂化；）
By the way, you don't need to change your PATHenvironment variable at all. The CLASSPATHis more than enough.
顺便说一句，您根本不需要更改PATH环境变量。该CLASSPATH是绰绰有余。
回答by Lew Bloch
As per the documentation:
根据文档：
It's better to use the classpath option (-classpathor -cp) to a command than the global CLASSPATHenvironment variable.
对命令使用类路径选项 (-classpath或-cp) 比全局CLASSPATH环境变量更好。
