java导入外部jar_Java导入外部jar文件

假设我在〜/ jar /中有TryJar.

java

public class TryJar {

public static void hello() {

System.out.println("Hello World!");

}

}

然后我输入&＃xff1a;

javac TryJar.java

jar cf TryJar.jar TryJar.class

我想在〜/ src /中的另一个源文件中导入这个类&＃xff1a;

public class TrySrc {

public static void main(String[] args) {

TryJar.hello();

}

}

我试过两种方法&＃xff1a;

1.

javac -cp ~/jar/TryJar.jar TrySrc.java

在编译期间没问题,但是当我尝试运行它时,会发生错误&＃xff1a;

java -cp .:~/jar/TryJar.jar TrySrc

Exception in thread "main" java.lang.NoClassDefFoundError: TryJar

at TrySrc.main(TrySrc.java:3)

Caused by: java.lang.ClassNotFoundException: TryJar

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 1 more

2.

我尝试在我的.bashrc和.profile中包含以下命令(我没有.bash_profile或.bash_login)&＃xff1a;

export CLASSPATH&＃61;$CLASSPATH:~/jar/TryJar.jar

和&＃xff1a;

source .bashrc

source .profile

但这一次,它仍然是错误的&＃xff1a;

javac TrySrc.java

TrySrc.java:3: error: cannot find symbol

TryJar.hello();

^

symbol: variable TryJar

location: class TrySrc

我该怎么做才能包含外部jar文件&＃xff1f;

编辑&＃xff1a;

整个项目只包含两个目录&＃xff1a;

~/jar/:

TryJar.java

TryJar.class

TryJar.jar

~/src/:

TrySrc.java

Jar的结构&＃xff1a;

jar tf TryJar.jar

META-INF/

META-INF/MANIFEST.MF

TryJar.class

我的系统是Ubuntu 12.04,java版本&＃xff1a;

java version "1.8.0"

Java(TM) SE Runtime Environment (build 1.8.0-b132)

Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

最佳答案 在你的方式1&＃xff1a;

尝试改变

java -cp ~/jar/TryJar.jar TrySrc

至

java -cp .:~/jar/TryJar.jar TrySrc

在classpath中包含当前目录以便能够加载TrySrc