如何在Java中打开一个.jar文件 [英] How to open a .jar file within Java

问题描述

我一直在试着制作一个程序，很明显，打开一个.zip文件并将其内容提取到.jar文件（minecraft.jar，用于修改Minecraft），但是找不到任何方法打开Java内的.jar文件这样做。打开一个.jar文件（不是运行它）并添加/删除.jar文件中的文件是可能的吗？

解决方案

@McDowell注释是解决方案的根源： java.util.jar 包是您可以找到所需工具的位置。

$第二，尽快修改JAR文件的内容是可能的，但是复杂而且相当多的工作。如果我的理解是正确的，打开这两个文件（ZIP和JAR文件），将它们解压到一个临时目录，然后重新压缩整个文件，这样做是不够的吗？

在我看来，结果将是你正在寻找的。这可能需要一段时间才能运行，但由于这是一次性的，我不觉得这是一个主要问题。

I've been trying to make a program that, evidently, opens a .zip file and extracts its contents into a .jar file(minecraft.jar, for modding Minecraft), but couldn't find any way to open a .jar file within Java to do so. Is opening a .jar file(not running it) and adding/deleting files within the .jar file possible?

解决方案

First, @McDowell comment is the root of your solution: the java.util.jar package is where you'll find the tools you need.

Second, modifying the content of a JAR file on the fly is possible, but complicated and rather a lot of work. Would it not be sufficient for your purposes to open both files (the ZIP and JAR ones, if I understand correctly), extract them in a temporary directory, then re-compress the whole lot?

It seems to me the result would be exactly what you're looking for. It might take a bit of a while to run, but since it's a one-off, I don't feel it's a major issue.

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