Ubuntu 中的 Java 类路径问题

Question

首先我运行的是 Ubuntu 9.10

我已将/etc/environment 文件编辑为如下所示:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
JAVA_HOME="/usr/lib/jvm/java-6-sun-1.6.0.20"
CLASSPATH="/home/travis/freetts/lib/freetts.jar:/home/travis/freetts/lib/jsapi.jar:."

然后我运行“source/etc/environment”以确保包含更改。然后我尝试使用这个编译我的简单测试程序:

javac 测试.java

它会抛出一些错误，但是当我这样编译时:

javac -cp/home/travis/freetts/lib/freetts.jar:/home/travis/freetts/lib/jsapi.jar:.测试.java

它工作得很好，这让我相信由于某种原因 javac 没有看到 CLASSPATH 环境变量？我可以回显它和终端中的所有内容:

echo $CLASSPATH 返回我输入的内容。

如有任何帮助，我们将不胜感激。

Answer 1

如果将 export 放在 /etc/environment 中是否有效？

export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
export JAVA_HOME="/usr/lib/jvm/java-6-sun-1.6.0.20"
export CLASSPATH="/home/travis/freetts/lib/freetts.jar:/home/travis/freetts/lib/jsapi.jar:."

我猜 CLASSPATH 在你获取脚本之前没有设置，所以你只是设置了一个局部变量。

---

下面是可能发生的情况的说明:

superman@metro:~$ Z=foo        # Only sets for this shell
superman@metro:~$ echo $Z
foo
superman@metro:~$ /bin/bash
superman@metro:~$ echo $Z      # Not set in sub-processes

superman@metro:~$ exit
exit
superman@metro:~$ export Z     # When exported, is part of environment
superman@metro:~$ /bin/bash
superman@metro:~$ echo $Z      # And now visible to sub-processes
foo
superman@metro:~$ exit
exit
superman@metro:~$ help export
export: export [-nf] [name[=value] ...] or export -p
     NAMEs are marked for automatic export to the environment of
    subsequently executed commands.  If the -f option is given,
    the NAMEs refer to functions.  If no NAMEs are given, or if '-p'
    is given, a list of all names that are exported in this shell is
    printed.  An argument of '-n' says to remove the export property
    from subsequent NAMEs.  An argument of '--' disables further option
    processing.