java class文件批量反编译

末蓝、 2022-05-12 09:56 274阅读 0赞

# java class文件批量反编译 #

需要先下载最新版本的jad文件。[https://varaneckas.com/jad/][https_varaneckas.com_jad]

jad -o -r -sjava -dsrc ‘tree/*\*/*.class’

由于jad反编译在多层目录结构下无法很好的处理，下面用脚本调用jad实现整个目录的反编译

import os
    import sys
    from os.path import join
    import subprocess
    
    
    def run_command(cmd):
        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=os.environ)
    
        try:
            outs, errs = proc.communicate(timeout=15)
            # print("outs %r %r" % (outs, proc))
        except Exception:
            proc.kill()
            outs, errs = proc.communicate()
        if errs is not None and len(errs) > 0:
            print("cmd %r, errs %r" % (cmd, errs))
        if errs is None or len(errs) == 0:
            return outs.decode()
        return errs
    
    print("__name__ %r" % (__name__))
    if __name__ == '__main__':
        frmdir = "classes"
        todir = "src"
        if len(sys.argv) >= 3:
            frmdir = sys.argv[1]
            todir = sys.argv[2]
    
        print("run %r frm %s to %s" % (sys.argv, frmdir, todir))
    
        for root, dirs, files in os.walk(frmdir):
            for f in files:
    
                if f.endswith('.class'):
                    clsfile = join(root, f)
                    tofile = clsfile.replace(frmdir, todir)
                    tofile = tofile.replace(".class", ".java")
                    tofiledir = os.path.dirname(tofile)
                    if not os.path.isdir(tofiledir):
                        # print("mkdir %s" % tofiledir)
                        run_command("mkdir %s" % tofiledir)
                    run_command("jad -o -p %s > %s" % (clsfile, tofile))
                    # print("gen file %s" % tofile)

把`jad.exe`和`jad.py`放到`path`环境中，跳到WEB-INF目录下，执行`jad.py`，会输出src的源文件目录。

[https_varaneckas.com_jad]: https://varaneckas.com/jad/