如果你的exe是用EXE4J生成的可以使用位运算提取class文件
File f=new File("...");//exe文件路径
File f1=new File("...");//生成的rar文件路径
FileInputStream fin=new FileInputStream(f);
FileOutputStream fout=new FileOutputStream(f1);
BufferedInputStream bin = new BufferedInputStream(fin);
BufferedOutputStream bout = new BufferedOutputStream(fout);
int in = 0;
do {
in = bin.read();
if (in == -1)
break;
in ^= 0x88;
bout.write(in);
} while (true);
bin.close();
fin.close();
bout.close();
fout.close();
运行完会生成rar,解压缩后得到项目目录,但文件是.class的,然后使用jd-gui反编译一下就是源代码了