在 Linux 脚本中设置 classPath
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Setting classPath inside Linux Script
提问by Pawan
I wrote a simple Linux Script this way
我用这种方式写了一个简单的 Linux 脚本
export JAVA_HOME=/usr/local/jdk1.6.0_20
export PATH=/usr/local/jdk1.6.0_20/bin
LIB_DIR=/home/praveen/lib
export CLASSPATH=.:$LIB_DIR/commons-logging-1.0.4.jar:$LIB_DIR/log4j-1.2.8.jar
java -cp $CLASSPATH com.test.Sample
===============================================================================
================================================== ==============================
The above script was working fine .
上面的脚本运行良好。
But when i tried for the first time with this , it was giving an error
但是当我第一次尝试这个时，它给出了一个错误
export JAVA_HOME=/usr/local/jdk1.6.0_20
export PATH=/usr/local/jdk1.6.0_20/bin
export CLASSPATH = /home/praveen/lib/commons-logging-1.0.4.jar: /home/praveen/lib/log4j-1.2.8.jar
java -cp $CLASSPATH com.test.Sample
As you can observe the only difference between these two scripts is that , in the below script on to the class path , i am not including the current directory path ( .)
您可以观察到这两个脚本之间的唯一区别是，在下面的类路径脚本中，我不包括当前目录路径 ( . )
Please let me know , why this will not work this way ??
请让我知道，为什么这不起作用？
采纳答案by Leonard Garvey
You need to use:
您需要使用：
export CLASSPATH=/home/praveen/lib/commons-logging-1.0.4.jar:/home/praveen/lib/log4j-1.2.8.jar
rather than:
而不是：
export CLASSPATH = /home/praveen/lib/commons-logging-1.0.4.jar: /home/praveen/lib/log4j-1.2.8.jar
You can't put spaces in between the variable name and the equals sign in shell scripting.
在 shell 脚本中，不能在变量名和等号之间放置空格。
回答by Leonard Garvey
Try this one..:
试试这个..：
#!/bin/bash
export JAVA_HOME=...
cp=$(find lib -name "*.jar" -exec printf :{} ';')
if [[ -n "$CLASSPATH" ]]; then
cp="$cp;CLASSPATH"
fi
"$JAVA_HOME/bin/java" -classpath "$cp" ...
回答by sirgeorge
You should not put any spaces in when you are setting variable, not even spaces around '=', it should be:
设置变量时不应该输入任何空格，甚至不应该在 '=' 周围放置空格，它应该是：
export CLASSPATH=/home/praveen/lib/commons-logging-1.0.4.jar:/home/praveen/lib/log4j-1.2.8.jar
If you have spaces in one of the elements use single or double quotations e.g.:
如果其中一个元素中有空格，请使用单引号或双引号，例如：
MY_VAR1=' variable with spaces'
MY_VAR2=variable_without_spaces
export MY_VAR3="${MY_VAR1}${MY_VAR2}"
