java读取文件 16进制_Java：文件到十六进制？

小编典典

你真幸运。我几个月前不得不这样做。这是一个精简版，需要从命令行获取两个参数。命令行参数都是文件名…第一个是输入文件，第二个是输出文件。输入文件以二进制形式读取，输出文件以ASCII十六进制形式写入。希望您可以根据自己的需要进行调整。

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileWriter;

import java.io.IOException;

public class BinToHex

{

private final static String[] hexSymbols = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

public final static int BITS_PER_HEX_DIGIT = 4;

public static String toHexFromByte(final byte b)

{

byte leftSymbol = (byte)((b >>> BITS_PER_HEX_DIGIT) & 0x0f);

byte rightSymbol = (byte)(b & 0x0f);

return (hexSymbols[leftSymbol] + hexSymbols[rightSymbol]);

}

public static String toHexFromBytes(final byte[] bytes)

{

if(bytes == null || bytes.length == 0)

{

return ("");

}

// there are 2 hex digits per byte

StringBuilder hexBuffer = new StringBuilder(bytes.length * 2);

// for each byte, convert it to hex and append it to the buffer

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

{

hexBuffer.append(toHexFromByte(bytes[i]));

}

return (hexBuffer.toString());

}

public static void main(final String[] args) throws IOException

{

try

{

FileInputStream fis = new FileInputStream(new File(args[0]));

BufferedWriter fos = new BufferedWriter(new FileWriter(new File(args[1])));

byte[] bytes = new byte[800];

int value = 0;

do

{

value = fis.read(bytes);

fos.write(toHexFromBytes(bytes));

}while(value != -1);

fos.flush();

fos.close();

}

catch(Exception e)

{

e.printStackTrace();

}

}

}

2020-11-01