如何找到包含类定义的 jar 文件? [英] how to find the jar file containing a class definition?

问题描述

是否有工具、插件或脚本可以用来在一堆 jar 文件中查找 java 类?

Is there a tool, plugin, or script I can use to find a java class in a bunch of jar files?

很多时候我继承的代码抱怨一个不存在的类，这只是因为类路径中没有包含 jar 文件.但是，类在哪个 jar 文件中?我可能没有 JAR(所以我必须在线搜索)，或者将 JAR 添加到类路径可能会产生重复的类定义问题.

Very often I inherit code that complains about a class that doesn't exist, and it is just because the jar file is not included in the classpath. But, in what jar file(s) is the class? I may not have the JAR (so I have to search online), or adding a JAR to the classpath could create a duplicated class definition problem.

我显然更喜欢 Eclipse 插件，但我对任何适用于 Windows 的软件都持开放态度.

I obviously would prefer an eclipse plugin, but I'm open to any piece of software that works with Windows.

我知道... Windows 不是我的选择，但这就是我必须使用的.

I know... Windows is not my choice, but that's what I got to work with.

谢谢！

路易斯

附言谢谢您的回答.在查看了一些回复后，我意识到我应该更好地解释我的场景.我们有一个下载或创建的 JAR 文件库，但有时该类会在某个地方在线.

P.S. Thank you for your answers. After reviewing some responses, I became aware that I should have explained better my scenario. We had a library of downloaded or created JAR files, but sometimes the class would be online somewhere.

推荐答案

(这是对我在以前版本的答案中的脚本的改进，因为它以一些 的代价产生了更清晰的输出awk 特殊/丑陋的引用.)

(This is an improvement over the script I had in previous versions of the answer as it produces much cleaner output at the price of some awk special/ugly quoting.)

我已经构建了一个脚本 (findinjars) 来做到这一点.

I've built a script (findinjars) which does just that.

#!/usr/bin/env bash
if [[ ($# -ne 1) && ($# -ne 2) ]]
then
    echo "usage is $0 <grep pattern to look for in 'jar tvf' output> [<top-of-dir-tree> or, if missing, current dir]"
else
    THING_TO_LOOKFOR="$1"
    DIR=${2:-.}
    if [ ! -d $DIR ]; then
        echo "directory [$DIR] does not exist";
        exit 1;
    fi
    find "$DIR" -iname *.jar | while read f ; do (jar tf $f | awk '{print "'"$f"'" "  " $0}' | grep -i "$THING_TO_LOOKFOR") ; done
fi

然后你可以调用它:

$findinjars a.b.c.d.Class [directoryTreeRoot or, if missing, current dir]

或者只是

$findinjars partOfClassName [directoryTreeRoot or, if missing, current dir]

完全限定类名中的点字符将在任何字符"的正则表达式意义上进行解释，但这没什么大不了的，因为这是一个启发式实用程序(这就是为什么它也不区分大小写).通常我不关心完整的类名，只输入它的一部分.

Dot characters in the fully qualified class name will be interpreted in the regexp sense of 'any character' but that's not a big deal since this is a heuristics utility (that's why it's case-insensitive too BTW). Usually I don't bother with the full class name and just type part of it.

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