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讀Class文件的示例程序

import java.io.BufferedInputStream;

import java.io.BufferedWriter;

import java.io.FileInputStream;

import java.io.FileWriter;

import java.io.IOException;

public class ReadAndWriteClass {

//16進制數字字符集

private static String hexString = "0123456789ABCDEF";

/** *//**

* 將字節數組的指定長度部分編碼成16進制數字字符串

* @param buffer 待編碼的字節數組

* @param length 指定的長度

* @return 編碼后連接而成的字符串

public static String encode(byte[] buffer,int length)

{

StringBuilder sbr = new StringBuilder();

//將字節數組中每個字節拆解成2位16進制整數

for(int i=0;i< length;i++)

{

sbr.append(hexString.charAt((buffer[i]&0xf0)>>4));

sbr.append(hexString.charAt(buffer[i]&0x0f));

sbr.append(" ");

}

return sbr.toString();

}

/** *//**

* 讀取一個Class文件，將其所有字節轉換為16進制整數，并以字符形式輸出

* @param inputPath 輸入文件的完整路徑

* @param outputPath 輸出文件的完整路徑

* @throws IOException 讀寫過程中可能拋出的異常

public static void rwclass(String inputPath, String outputPath)

throws IOException {

//讀取Class文件要用字節輸入流

BufferedInputStream bis =

new BufferedInputStream(new FileInputStream(inputPath));

//輸出轉換后的文件要用字符輸出流

BufferedWriter bw =

new BufferedWriter(new FileWriter(outputPath));

int readSize = 16;

byte[] buffer_read = new byte[readSize];

String line;

String lineNumber = "0000000";

String strReplace;

int i = 0;

while ((readSize = bis.read(buffer_read,0,readSize))!= -1)

{

line = encode(buffer_read,readSize);

strReplace = Integer.toHexString(i);

lineNumber = lineNumber.substring(0, 7-strReplace.length());

lineNumber = lineNumber+strReplace;

line = lineNumber+"0h: "+line;

bw.write(line);

bw.newLine();

i++;

}

bis.close();

bw.close();

}

/** *//**

* 程序的入口方法

* @param args

* @throws IOException

public static void main(String[] args)

{

//指定輸入、輸出文件的完整路徑

String inputPath = "c:/kk/ReadAndWriteClass.class";

String outputPath = "c:/kk/ReadAndWriteClass.txt";

try {

rwclass(inputPath, outputPath);

System.out.println("Successfully !");

} catch (IOException ioe) {

System.err.println("Something wrong with reading or writing !");

ioe.printStackTrace();

}

輸出：

00000000h: CA FE BA BE 00 00 00 31 00 82 0A 00 29 00 3A 07

00000010h: 00 3B 0A 00 02 00 3A 09 00 28 00 3C 0A 00 3D 00

00000020h: 3E 0A 00 02 00 3F 08 00 40 0A 00 02 00 41 0A 00

00000030h: 02 00 42 07 00 43 07 00 44 0A 00 0B 00 45 0A 00

00000040h: 0A 00 46 07 00 47 07 00 48 0A 00 0F 00 45 0A 00

00000050h: 0E 00 49 08 00 4A 0A 00 0A 00 4B 0A 00 28 00 4C

00000060h: 0A 00 4D 00 4E 0A 00 3D 00 4F 0A 00 3D 00 50 08

00000070h: 00 51 0A 00 0E 00 52 0A 00 0E 00 53 0A 00 0A 00

00000080h: 54 0A 00 0E 00 54 08 00 55 08 00 56 0A 00 28 00

00000090h: 57 09 00 58 00 59 08 00 5A 0A 00 5B 00 5C 07 00

000000a0h: 5D 09 00 58 00 5E 08 00 5F 0A 00 23 00 60 08 00

000000b0h: 61 07 00 62 07 00 63 01 00 09 68 65 78 53 74 72

000000c0h: 69 6E 67 01 00 12 4C 6A 61 76 61 2F 6C 61 6E 67

000000d0h: 2F 53 74 72 69 6E 67 3B 01 00 06 3C 69 6E 69 74

000000e0h: 3E 01 00 03 28 29 56 01 00 04 43 6F 64 65 01 00

000000f0h: 0F 4C 69 6E 65 4E 75 6D 62 65 72 54 61 62 6C 65

00000100h: 01 00 06 65 6E 63 6F 64 65 01 00 17 28 5B 42 49

00000110h: 29 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69

00000120h: 6E 67 3B 01 00 07 72 77 63 6C 61 73 73 01 00 27

00000130h: 28 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69

00000140h: 6E 67 3B 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74

00000150h: 72 69 6E 67 3B 29 56 01 00 0A 45 78 63 65 70 74

00000160h: 69 6F 6E 73 01 00 04 6D 61 69 6E 01 00 16 28 5B

00000170h: 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69 6E

00000180h: 67 3B 29 56 01 00 08 3C 63 6C 69 6E 69 74 3E 01

00000190h: 00 0A 53 6F 75 72 63 65 46 69 6C 65 01 00 16 52

000001a0h: 65 61 64 41 6E 64 57 72 69 74 65 43 6C 61 73 73

000001b0h: 2E 6A 61 76 61 0C 00 2C 00 2D 01 00 17 6A 61 76

000001c0h: 61 2F 6C 61 6E 67 2F 53 74 72 69 6E 67 42 75 69

000001d0h: 6C 64 65 72 0C 00 2A 00 2B 07 00 64 0C 00 65 00

000001e0h: 66 0C 00 67 00 68 01 00 01 20 0C 00 67 00 69 0C

000001f0h: 00 6A 00 6B 01 00 1B 6A 61 76 61 2F 69 6F 2F 42

00000200h: 75 66 66 65 72 65 64 49 6E 70 75 74 53 74 72 65

00000210h: 61 6D 01 00 17 6A 61 76 61 2F 69 6F 2F 46 69 6C

00000220h: 65 49 6E 70 75 74 53 74 72 65 61 6D 0C 00 2C 00

00000230h: 6C 0C 00 2C 00 6D 01 00 16 6A 61 76 61 2F 69 6F

00000240h: 2F 42 75 66 66 65 72 65 64 57 72 69 74 65 72 01

00000250h: 00 12 6A 61 76 61 2F 69 6F 2F 46 69 6C 65 57 72

00000260h: 69 74 65 72 0C 00 2C 00 6E 01 00 07 30 30 30 30

00000270h: 30 30 30 0C 00 6F 00 70 0C 00 30 00 31 07 00 71

00000280h: 0C 00 72 00 73 0C 00 74 00 75 0C 00 76 00 77 01

00000290h: 00 04 30 68 3A 20 0C 00 78 00 6C 0C 00 79 00 2D

000002a0h: 0C 00 7A 00 2D 01 00 1D 63 3A 2F 6B 6B 2F 52 65

000002b0h: 61 64 41 6E 64 57 72 69 74 65 43 6C 61 73 73 2E

000002c0h: 63 6C 61 73 73 01 00 1B 63 3A 2F 6B 6B 2F 52 65

000002d0h: 61 64 41 6E 64 57 72 69 74 65 43 6C 61 73 73 2E

000002e0h: 74 78 74 0C 00 32 00 33 07 00 7B 0C 00 7C 00 7D

000002f0h: 01 00 0E 53 75 63 63 65 73 73 66 75 6C 6C 79 20

00000300h: 21 07 00 7E 0C 00 7F 00 6C 01 00 13 6A 61 76 61

00000310h: 2F 69 6F 2F 49 4F 45 78 63 65 70 74 69 6F 6E 0C

00000320h: 00 80 00 7D 01 00 29 53 6F 6D 65 74 68 69 6E 67

00000330h: 20 77 72 6F 6E 67 20 77 69 74 68 20 72 65 61 64

00000340h: 69 6E 67 20 6F 72 20 77 72 69 74 69 6E 67 20 21

00000350h: 0C 00 81 00 2D 01 00 10 30 31 32 33 34 35 36 37

00000360h: 38 39 41 42 43 44 45 46 01 00 11 52 65 61 64 41

00000370h: 6E 64 57 72 69 74 65 43 6C 61 73 73 01 00 10 6A

00000380h: 61 76 61 2F 6C 61 6E 67 2F 4F 62 6A 65 63 74 01

00000390h: 00 10 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69

000003a0h: 6E 67 01 00 06 63 68 61 72 41 74 01 00 04 28 49

000003b0h: 29 43 01 00 06 61 70 70 65 6E 64 01 00 1C 28 43

000003c0h: 29 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69

000003d0h: 6E 67 42 75 69 6C 64 65 72 3B 01 00 2D 28 4C 6A

000003e0h: 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69 6E 67 3B

000003f0h: 29 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69

00000400h: 6E 67 42 75 69 6C 64 65 72 3B 01 00 08 74 6F 53

00000410h: 74 72 69 6E 67 01 00 14 28 29 4C 6A 61 76 61 2F

00000420h: 6C 61 6E 67 2F 53 74 72 69 6E 67 3B 01 00 15 28

00000430h: 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69 6E

00000440h: 67 3B 29 56 01 00 18 28 4C 6A 61 76 61 2F 69 6F

00000450h: 2F 49 6E 70 75 74 53 74 72 65 61 6D 3B 29 56 01

00000460h: 00 13 28 4C 6A 61 76 61 2F 69 6F 2F 57 72 69 74

00000470h: 65 72 3B 29 56 01 00 04 72 65 61 64 01 00 07 28

00000480h: 5B 42 49 49 29 49 01 00 11 6A 61 76 61 2F 6C 61

00000490h: 6E 67 2F 49 6E 74 65 67 65 72 01 00 0B 74 6F 48

000004a0h: 65 78 53 74 72 69 6E 67 01 00 15 28 49 29 4C 6A

000004b0h: 61 76 61 2F 6C 61 6E 67 2F 53 74 72 69 6E 67 3B

000004c0h: 01 00 06 6C 65 6E 67 74 68 01 00 03 28 29 49 01

000004d0h: 00 09 73 75 62 73 74 72 69 6E 67 01 00 16 28 49

000004e0h: 49 29 4C 6A 61 76 61 2F 6C 61 6E 67 2F 53 74 72

000004f0h: 69 6E 67 3B 01 00 05 77 72 69 74 65 01 00 07 6E

00000500h: 65 77 4C 69 6E 65 01 00 05 63 6C 6F 73 65 01 00

00000510h: 10 6A 61 76 61 2F 6C 61 6E 67 2F 53 79 73 74 65

00000520h: 6D 01 00 03 6F 75 74 01 00 15 4C 6A 61 76 61 2F

00000530h: 69 6F 2F 50 72 69 6E 74 53 74 72 65 61 6D 3B 01

00000540h: 00 13 6A 61 76 61 2F 69 6F 2F 50 72 69 6E 74 53

00000550h: 74 72 65 61 6D 01 00 07 70 72 69 6E 74 6C 6E 01

00000560h: 00 03 65 72 72 01 00 0F 70 72 69 6E 74 53 74 61

00000570h: 63 6B 54 72 61 63 65 00 21 00 28 00 29 00 00 00

00000580h: 01 00 0A 00 2A 00 2B 00 00 00 05 00 01 00 2C 00

00000590h: 2D 00 01 00 2E 00 00 00 1D 00 01 00 01 00 00 00

000005a0h: 05 2A B7 00 01 B1 00 00 00 01 00 2F 00 00 00 06

000005b0h: 00 01 00 00 00 07 00 09 00 30 00 31 00 01 00 2E

000005c0h: 00 00 00 76 00 04 00 04 00 00 00 46 BB 00 02 59

000005d0h: B7 00 03 4D 03 3E 1D 1B A2 00 35 2C B2 00 04 2A

000005e0h: 1D 33 11 00 F0 7E 07 7A B6 00 05 B6 00 06 57 2C

000005f0h: B2 00 04 2A 1D 33 10 0F 7E B6 00 05 B6 00 06 57

00000600h: 2C 12 07 B6 00 08 57 84 03 01 A7 FF CC 2C B6 00

00000610h: 09 B0 00 00 00 01 00 2F 00 00 00 1E 00 07 00 00

00000620h: 00 14 00 08 00 16 00 0F 00 18 00 23 00 19 00 34

00000630h: 00 1A 00 3B 00 16 00 41 00 1C 00 09 00 32 00 33

00000640h: 00 02 00 2E 00 00 01 0B 00 05 00 0A 00 00 00 AB

00000650h: BB 00 0A 59 BB 00 0B 59 2A B7 00 0C B7 00 0D 4D

00000660h: BB 00 0E 59 BB 00 0F 59 2B B7 00 10 B7 00 11 4E

00000670h: 10 10 36 04 15 04 BC 08 3A 05 12 12 3A 07 03 36

00000680h: 09 2C 19 05 03 15 04 B6 00 13 59 36 04 02 9F 00

00000690h: 64 19 05 15 04 B8 00 14 3A 06 15 09 B8 00 15 3A

000006a0h: 08 19 07 03 10 07 19 08 B6 00 16 64 B6 00 17 3A

000006b0h: 07 BB 00 02 59 B7 00 03 19 07 B6 00 08 19 08 B6

000006c0h: 00 08 B6 00 09 3A 07 BB 00 02 59 B7 00 03 19 07

000006d0h: B6 00 08 12 18 B6 00 08 19 06 B6 00 08 B6 00 09

000006e0h: 3A 06 2D 19 06 B6 00 19 2D B6 00 1A 84 09 01 A7

000006f0h: FF 92 2C B6 00 1B 2D B6 00 1C B1 00 00 00 01 00

00000700h: 2F 00 00 00 4E 00 13 00 00 00 28 00 10 00 2B 00

00000710h: 20 00 2E 00 24 00 2F 00 2A 00 31 00 2E 00 33 00

00000720h: 31 00 34 00 41 00 36 00 4A 00 37 00 51 00 38 00

00000730h: 61 00 39 00 77 00 3A 00 92 00 3B 00 98 00 3C 00

00000740h: 9C 00 3D 00 9F 00 3E 00 A2 00 3F 00 A6 00 40 00

00000750h: AA 00 41 00 34 00 00 00 04 00 01 00 23 00 09 00

00000760h: 35 00 36 00 01 00 2E 00 00 00 64 00 02 00 04 00

00000770h: 00 00 24 12 1D 4C 12 1E 4D 2B 2C B8 00 1F B2 00

00000780h: 20 12 21 B6 00 22 A7 00 10 4E B2 00 24 12 25 B6

00000790h: 00 22 2D B6 00 26 B1 00 01 00 06 00 13 00 16 00

000007a0h: 23 00 01 00 2F 00 00 00 26 00 09 00 00 00 4B 00

000007b0h: 03 00 4C 00 06 00 4F 00 0B 00 50 00 13 00 54 00

000007c0h: 16 00 51 00 17 00 52 00 1F 00 53 00 23 00 56 00

000007d0h: 08 00 37 00 2D 00 01 00 2E 00 00 00 1E 00 01 00

000007e0h: 00 00 00 00 06 12 27 B3 00 04 B1 00 00 00 01 00

000007f0h: 2F 00 00 00 06 00 01 00 00 00 0A 00 01 00 38 00

00000800h: 00 00 02 00 39

posted on 2008-02-26 06:58 々上善若水々閱讀(763) 評論(0) 編輯收藏所屬分類: J2SE

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讀Class文件的示例程序

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