Question

如何dump出一个Java进程里的类对应的Class文件

Answer 1

class-dump-x 提取私有库里面的隐藏文件

class-dump
This is a command-line utility for examining the Objective-C runtime information stored in Mach-O files. It generates declarations for the classes, categories and protocols. This is the same information provided by using 'otool -ov', but presented as normal Objective-C declarations, so it is much more compact and readable.
Why use class-dump?
It's a great tool for the curious. You can look at the design of closed source applications, frameworks, and bundles. Watch the interfaces evolve between releases. Experiment with private frameworks, or see what private goodies are hiding in the AppKit. Learn about the plugin API lurking in Mail.app.
If you find class-dump useful, you can donate to help support its development. Thanks!
Download
Current version: 3.3.3 (Universal, 64 and 32 bit)
Requires Mac OS X 10.5 or later.
class-dump-3.3.3.dmg
class-dump-3.3.3.tar.gz
class-dump-3.3.3.tar.bz2
Changes - News
Contact
You can email questions and bug reports to me at class-dump@codethecode.com, or nygard at gmail.com.
Usage
class-dump 3.3.3 (64 bit)
Usage: class-dump [options] <mach-o-file>

where options are:
-a show instance variable offsets
-A show implementation addresses
--arch <arch> choose a specific architecture from a universal binary (ppc, ppc7400, ppc64, i386, x86_64, etc.)
-C <regex> only display classes matching regular expression
-f <str> find string in method name
-H generate header files in current directory, or directory specified with -o
-I sort classes, categories, and protocols by inheritance (overrides -s)
-o <dir> output directory used for -H
-r recursively expand frameworks and fixed VM shared libraries
-s sort classes and categories by name
-S sort methods by name
-t suppress header in output, for testing
--list-arches list the arches in the file, then exit
--sdk-root specify the SDK root path (full path, or 4.1, 4.0, 3.2, 10.6, 10.5, 3.1.3, 3.1.2, 3.1)

License
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

class-dump -H /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator2.1.sdk/System/Library/CoreServices/SpringBoard.app/SpringBoard
-o
~/Desktop/SpringBoard
使用：
1 将下载好的 class-dump 放入usr/local/bin 下.
如果 ‘/usr/local/bin’ 不知道在哪里，可以在terminal 下输入 ‘open -a Finder /usr/local/bin’ 以便打开目录.
记着 class-dump 要 使用 chmod 修改下执行权限. 例如：在usr/local/bin 对 class-dump 修改，可以这 样在terminal 切换到 usr/local/bin 目录下: chmod 777 class-dump .
2 将DumpFrameworks.pl 放入任意目录下.同样需要修改执行权限.
3. OK..现在所有的准备工作作好了. 我们在 terminal 的任意目录下 输入 ： ./DumpFrameworks.pl
等待...
会有一个Heards 文件夹在你的主目录下. 里面包含了 Frmeworks 和 privateFrameworks 下所有的私有 API,尽情享用吧.!