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如何反编译Java

发布于 2024-10-06 14:51:26 字数 75 浏览 0 评论 0原文

我想要一个简单的方法来反编译Java。我想检查 javac 编译器对我的代码进行的转换和修改。什么是好的产品以及它们的优点/缺点是什么。

原文

I would like a simple way to decompile Java. I want to examine the conversions and modifications that the javac compiler makes on my code. What would be some good products and what would be the good/bad of them.

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岁月染过的梦 2024-10-13 14:51:26

快速而肮脏地，使用 JDK 附带的 javap。

javap -c test
Compiled from "test.java"
public class test extends java.lang.Object{
public test();
  Code:
   0:   aload_0
   1:   invokespecial   #1; //Method java/lang/Object."<init>":()V
   4:   return

public static void main(java.lang.String[])   throws java.lang.Exception;
  Code:
   0:   ldc #2; //String CR_ABC_DEF_GHI
   2:   astore_1
   3:   ldc #3; //String TYPE=Eligibility Only|CLIENT_ID=62|EMPLOYER_ID=0|LOCATION_ID=0|PLAN_ID=all|FREQUENCY=52|FILE=null|FILETYPE=C|PROCESSTOLAUNCH=10|PROCESSTOLAUNCHSTATUS=100|SCHEDULE_ID=29837d692f4c43e786f1097fab7c360c
   5:   astore_2
   6:   ldc #4; //String \|
   8:   astore_3
   9:   ldc #5; //String FILE_NAME_TEMPLATE
   11:  astore  4
   13:  ldc #6; //String FILE
   15:  astore  5
   17:  new #7; //class java/lang/StringBuilder
   20:  dup
   21:  invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   24:  aload_3
   25:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   28:  aload   4
   30:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   33:  ldc #10; //String =
   35:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   38:  ldc #11; //String [^
   40:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   43:  aload_3
   44:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   47:  ldc #12; //String ]*
   49:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   52:  aload_3
   53:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   56:  invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   59:  astore  6
   61:  new #7; //class java/lang/StringBuilder
   64:  dup
   65:  invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   68:  aload_3
   69:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   72:  aload   5
   74:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   77:  ldc #10; //String =
   79:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   82:  ldc #11; //String [^
   84:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   87:  aload_3
   88:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   91:  ldc #12; //String ]*
   93:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   96:  aload_3
   97:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   100: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   103: astore  7
   105: new #7; //class java/lang/StringBuilder
   108: dup
   109: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   112: aload_3
   113: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   116: aload   4
   118: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   121: ldc #10; //String =
   123: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   126: aload_1
   127: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   130: aload_3
   131: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   134: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   137: astore  8
   139: aload_2
   140: aload   6
   142: aload   8
   144: invokevirtual   #14; //Method java/lang/String.replaceAll:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
   147: aload   7
   149: aload   8
   151: invokevirtual   #14; //Method java/lang/String.replaceAll:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
   154: astore  9
   156: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   159: new #7; //class java/lang/StringBuilder
   162: dup
   163: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   166: ldc #16; //String before = 
   168: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   171: aload_2
   172: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   175: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   178: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   181: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   184: new #7; //class java/lang/StringBuilder
   187: dup
   188: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   191: ldc #18; //String pattern1 = 
   193: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   196: aload   6
   198: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   201: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   204: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   207: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   210: new #7; //class java/lang/StringBuilder
   213: dup
   214: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   217: ldc #19; //String pattern2 = 
   219: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   222: aload   7
   224: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   227: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   230: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   233: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   236: new #7; //class java/lang/StringBuilder
   239: dup
   240: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   243: ldc #20; //String replace = 
   245: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   248: aload   8
   250: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   253: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   256: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   259: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   262: new #7; //class java/lang/StringBuilder
   265: dup
   266: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   269: ldc #21; //String after = 
   271: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   274: aload   9
   276: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   279: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   282: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   285: return

}

Quick and dirty, use the javap that ships with the JDK.

javap -c test
Compiled from "test.java"
public class test extends java.lang.Object{
public test();
  Code:
   0:   aload_0
   1:   invokespecial   #1; //Method java/lang/Object."<init>":()V
   4:   return

public static void main(java.lang.String[])   throws java.lang.Exception;
  Code:
   0:   ldc #2; //String CR_ABC_DEF_GHI
   2:   astore_1
   3:   ldc #3; //String TYPE=Eligibility Only|CLIENT_ID=62|EMPLOYER_ID=0|LOCATION_ID=0|PLAN_ID=all|FREQUENCY=52|FILE=null|FILETYPE=C|PROCESSTOLAUNCH=10|PROCESSTOLAUNCHSTATUS=100|SCHEDULE_ID=29837d692f4c43e786f1097fab7c360c
   5:   astore_2
   6:   ldc #4; //String \|
   8:   astore_3
   9:   ldc #5; //String FILE_NAME_TEMPLATE
   11:  astore  4
   13:  ldc #6; //String FILE
   15:  astore  5
   17:  new #7; //class java/lang/StringBuilder
   20:  dup
   21:  invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   24:  aload_3
   25:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   28:  aload   4
   30:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   33:  ldc #10; //String =
   35:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   38:  ldc #11; //String [^
   40:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   43:  aload_3
   44:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   47:  ldc #12; //String ]*
   49:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   52:  aload_3
   53:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   56:  invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   59:  astore  6
   61:  new #7; //class java/lang/StringBuilder
   64:  dup
   65:  invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   68:  aload_3
   69:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   72:  aload   5
   74:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   77:  ldc #10; //String =
   79:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   82:  ldc #11; //String [^
   84:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   87:  aload_3
   88:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   91:  ldc #12; //String ]*
   93:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   96:  aload_3
   97:  invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   100: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   103: astore  7
   105: new #7; //class java/lang/StringBuilder
   108: dup
   109: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   112: aload_3
   113: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   116: aload   4
   118: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   121: ldc #10; //String =
   123: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   126: aload_1
   127: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   130: aload_3
   131: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   134: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   137: astore  8
   139: aload_2
   140: aload   6
   142: aload   8
   144: invokevirtual   #14; //Method java/lang/String.replaceAll:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
   147: aload   7
   149: aload   8
   151: invokevirtual   #14; //Method java/lang/String.replaceAll:(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
   154: astore  9
   156: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   159: new #7; //class java/lang/StringBuilder
   162: dup
   163: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   166: ldc #16; //String before = 
   168: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   171: aload_2
   172: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   175: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   178: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   181: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   184: new #7; //class java/lang/StringBuilder
   187: dup
   188: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   191: ldc #18; //String pattern1 = 
   193: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   196: aload   6
   198: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   201: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   204: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   207: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   210: new #7; //class java/lang/StringBuilder
   213: dup
   214: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   217: ldc #19; //String pattern2 = 
   219: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   222: aload   7
   224: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   227: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   230: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   233: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   236: new #7; //class java/lang/StringBuilder
   239: dup
   240: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   243: ldc #20; //String replace = 
   245: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   248: aload   8
   250: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   253: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   256: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   259: getstatic   #15; //Field java/lang/System.out:Ljava/io/PrintStream;
   262: new #7; //class java/lang/StringBuilder
   265: dup
   266: invokespecial   #8; //Method java/lang/StringBuilder."<init>":()V
   269: ldc #21; //String after = 
   271: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   274: aload   9
   276: invokevirtual   #9; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
   279: invokevirtual   #13; //Method java/lang/StringBuilder.toString:()Ljava/lang/String;
   282: invokevirtual   #17; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   285: return

}
回复 原文
深陷 2024-10-13 14:51:26

最好的可能是 jad：

http://www.varaneckas.com/jad

如果您使用 Eclipse，您可以使用 JadClipse 插件，以获得更符合人体工程学的界面：

http://jadclipse.sourceforge。 net/wiki/index.php/Main_Page

The best one is probably jad:

http://www.varaneckas.com/jad

If you use Eclipse, you can use the JadClipse plugin, for a more ergonomic interface:

http://jadclipse.sourceforge.net/wiki/index.php/Main_Page

回复 原文
多彩岁月 2024-10-13 14:51:26

我发现这个工具非常好。

I have found this tool pretty good.

回复 原文
月亮邮递员 2024-10-13 14:51:26

另一个 java 反编译器 – AndroChef Java Decompiler 可用：http://www.neshkov.com/ac_decompiler.html

Another java decompiler – AndroChef Java Decompiler is available: http://www.neshkov.com/ac_decompiler.html

回复 原文
北方的巷 2024-10-13 14:51:26

我使用过 JAD 并且可以证明它的实用性。

需要注意的是，任何反编译的代码很可能都没有任何注释，如果代码被混淆，那么反编译将不会真正让你有任何收获。它看起来仍然像胡言乱语。

I've used JAD and can atest to it's usefulness.

Just as a heads up though that any de-compiled code is most likely going to be free of any comments, and if the code is obfuscated then decompiling won't really get you any where. It will still look like jibberish.

回复 原文
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