Class文�g格式解析

独孤求��| — Fri, 01 Feb 2008 04:48:00 GMT

摘要: 重新整理了一下，在原来的基础上做了大量的更新和细化工作，希望寚w��读这��blog的朋友有点帮�?) 阅读全文

独孤求��| 2008-02-01 12:48 发表评论

独孤求��| — Thu, 31 Jan 2008 20:11:00 GMT

1package bytecodeResearch;
2
3import java.io.BufferedInputStream;
4import java.io.BufferedWriter;
5import java.io.FileInputStream;
6import java.io.FileWriter;
7import java.io.IOException;
8
9public class ReadAndWriteClass {
10
11    //16�q�制数字字符�?nbsp;
12    private static String hexString = "0123456789ABCDEF";
13
14    /**
15     * ��字节数�l�的指定长度部分�~�码�?6�q�制数字字符�?br /> 16     * @param buffer 待编码的字节数组
17     * @param length 指定的长�?br /> 18     * @return �~�码后连接而成的字�W�串
19     */
20    public static String encode(byte[] buffer,int length)
21    {
22        StringBuilder sbr = new StringBuilder();
23        //��字节数�l�中每个字节拆解�?�?6�q�制整数
24        for(int i=0;i<length;i++)
25        {
26            sbr.append(hexString.charAt((buffer[i]&0xf0)>>4));
27            sbr.append(hexString.charAt(buffer[i]&0x0f));
28            sbr.append("  ");
29        }
30        return sbr.toString();
31    }
32
33    /**
34     * ��d��一个Class文�g�Q�将其所有字节�{换�ؓ16�q�制整数�Q��ƈ以字�W��Ş式输�?br /> 35     * @param inputPath  输入文�g的完整�\�?br /> 36     * @param outputPath 输出文�g的完整�\�?br /> 37     * @throws IOException ��d��q�程中可能抛出的异常
38     */
39    public static void rwclass(String inputPath, String outputPath) throws IOException
40    {
41        //��d��Class文�g要用字节输入��?/span>
42        BufferedInputStream bis = new BufferedInputStream(
43                new FileInputStream(inputPath));
44        //输出转换后的文�g要用字符输出��?/span>
45        BufferedWriter bw = new BufferedWriter(
46                new FileWriter(outputPath));
47
48        int readSize = 16;
49        byte[] buffer_read = new byte[readSize];
50        String line;
51        String lineNumber = "0000000";
52        String strReplace;
53        int i = 0;
54        while ((readSize = bis.read(buffer_read,0,readSize))!= -1)
55        {
56            line = encode(buffer_read,readSize);
57            strReplace = Integer.toHexString(i);
58            lineNumber = lineNumber.substring(0, 7-strReplace.length());
59            lineNumber = lineNumber+strReplace;
60            line = lineNumber+"0h: "+line;
61            bw.write(line);
62            bw.newLine();
63            i++;
64        }
65        bis.close();
66        bw.close();
67    }
68
69    /**
70     * �E�序的入口方�?br /> 71     * @param args
72     * @throws IOException
73     */
74    public static void main(String[] args)
75    {
76        //指定输入、输出文件的完整路径
77        String inputPath = "L:/HelloWorld/HelloWorld.class";
78        String outputPath = "L:/HelloWorld/HelloWorld_ByteCode.txt";
79
80        try {
81            rwclass(inputPath, outputPath);
82            System.out.println("Successfully !");
83        } catch (IOException ioe) {
84            System.err.println("Something wrong with reading or writing !");
85            ioe.printStackTrace();
86        }
87
88    }
89
90}
91

独孤求��| 2008-02-01 04:11 发表评论

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Class文�g格式解析