bash 从 Cygwin 设置 CLASSPATH
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Setting the CLASSPATH from Cygwin
提问by parker.sikand
I use Eclipse to develop Java so I have a folder full of Eclipse Java Project folders. The /bin folder resides in each folder, so to run the project from Cygwin, the classpath must be set (on my system) to: "E:/programming/java/workspace/SomeProject/bin". Since there are ~40 projects in my folder, I'd rather make a script to add the paths to the CLASSPATH. My script seems to add the paths to CLASSPATH, but when I try to run Java I get a class not found error. In my .bashrc here is my script:
我使用 Eclipse 来开发 Java，所以我有一个充满 Eclipse Java Project 文件夹的文件夹。/bin 文件夹位于每个文件夹中，因此要从 Cygwin 运行项目，必须将类路径设置为（在我的系统上）：“E:/programming/java/workspace/SomeProject/bin”。由于我的文件夹中有大约 40 个项目，我宁愿编写一个脚本来将路径添加到 CLASSPATH。我的脚本似乎将路径添加到 CLASSPATH，但是当我尝试运行 Java 时，我收到一个找不到类的错误。在我的 .bashrc 中，这是我的脚本：
JAVAWORKSPACE="/cygdrive/e/programming/java/workspace/*"
BIN="/bin;"
for f in $JAVAWORKSPACE
do
if [ -d $f ] ; then
export CLASSPATH="$f$BIN$CLASSPATH"
fi
done
When I start Cygwin and echo $CLASSPATH, all of the directories show up, but java can't find the classes. I have also tried JAVAWORKSPACE="E:\programming\java\workspace\*but this resulted in nothing being added to CLASSPATH. If I go through the Windows settings and manually enter "E:/programming/java/workspace/MyProject/bin" to the CLASSPATH, command line Java has no trouble finding the classes. What's up with this? I'm not sure if it's a problem with the script or if CLASSPATH doesn't like unix-style paths. If I need to add windows paths, please help me change my script to do this. Thanks!
当我启动 Cygwin 并回显 $CLASSPATH 时，所有目录都显示出来，但 java 找不到这些类。我也尝试过，JAVAWORKSPACE="E:\programming\java\workspace\*但这导致没有向 CLASSPATH 添加任何内容。如果我通过 Windows 设置并在 CLASSPATH 中手动输入“E:/programming/java/workspace/MyProject/bin”，命令行 Java 可以轻松找到这些类。这是怎么回事？我不确定这是脚本的问题还是 CLASSPATH 不喜欢 unix 样式的路径。如果我需要添加 Windows 路径，请帮助我更改脚本以执行此操作。谢谢！
回答by P. Myer Nore
I don't have Cygwin set up right now, but I ran into this problem a number of years ago. Java knows nothing about Cygwin pathnames, and bash treats a single backslash as an escape character, stripping it before it can be transmitted to java(c). If you do
我现在没有设置 Cygwin，但几年前我遇到了这个问题。Java 对 Cygwin 路径名一无所知，bash 将单个反斜杠视为转义字符，在将其传输到 java(c) 之前将其剥离。如果你这样做
echo E:\programming\java\workspace\*
You'll see it outputs E:programmingjavaworkspace*, not what you're expecting. The key is to either escape the escape chars, like
您会看到它输出 E:programmingjavaworkspace*，而不是您所期望的。关键是要么逃避转义字符，比如
E:\programming\java\workspace\*
