Java 实现十六进制数与图片的互相转换

1.十六进制转图片jpg

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.InputStreamReader;/** * 十六进制转成图片 */public class Hex2Image{public static void main(String[] args) throws Exception{Hex2Image to = new Hex2Image();InputStream is = new FileInputStream("V:/aaa.txt");InputStreamReader isr = new InputStreamReader(is);BufferedReader br = new BufferedReader(isr);String str = null;StringBuilder sb = new StringBuilder();while ((str = br.readLine()) != null){System.out.println(str);sb.append(str);}to.saveToImgFile(sb.toString().toUpperCase(), "V:/bbb.jpg");}public void saveToImgFile(String src, String output){if (src == null || src.length() == 0){return;}try{FileOutputStream out = new FileOutputStream(new File(output));byte[] bytes = src.getBytes();for (int i = 0; i < bytes.length; i += 2){out.write(charToInt(bytes[i]) * 16 + charToInt(bytes[i + 1]));}out.close();}catch (Exception e){e.printStackTrace();}}private int charToInt(byte ch){int val = 0;if (ch >= 0x30 && ch <= 0x39){val = ch - 0x30;}else if (ch >= 0x41 && ch <= 0x46){val = ch - 0x41 + 10;}return val;}}

2.图片转成16进制

import java.io.BufferedInputStream;import java.io.FileInputStream;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;/** * 图片转成十六进制 */public class ImageToHex{public static void main(String[] args) throws Exception{try{StringBuffer sb = new StringBuffer();FileInputStream fis = new FileInputStream("V:/aaa.jpg");BufferedInputStream bis = new BufferedInputStream(fis);java.io.ByteArrayOutputStream bos = new java.io.ByteArrayOutputStream();byte[] buff = new byte[1024];int len = 0;while ((len = fis.read(buff)) != -1){bos.write(buff, 0, len);}// 得到图片的字节数组byte[] result = bos.toByteArray();System.out.println("++++" + byte2HexStr(result));// 字节数组转成十六进制String str = byte2HexStr(result);/* * 将十六进制串保存到txt文件中 */PrintWriter pw = new PrintWriter(new FileWriter("V:/aaa.txt"));pw.println(str);pw.close();}catch (IOException e){e.printStackTrace();}}/* * 实现字节数组向十六进制的转换方法一 */public static String byte2HexStr(byte[] b){String hs = "";String stmp = "";for (int n = 0; n < b.length; n++){stmp = (Integer.toHexString(b[n] & 0XFF));if (stmp.length() == 1)hs = hs + "0" + stmp;elsehs = hs + stmp;}return hs.toUpperCase();}private static byte uniteBytes(String src0, String src1){byte b0 = Byte.decode("0x" + src0).byteValue();b0 = (byte) (b0 << 4);byte b1 = Byte.decode("0x" + src1).byteValue();byte ret = (byte) (b0 | b1);return ret;}/* * 实现字节数组向十六进制的转换的方法二 */public static String bytesToHexString(byte[] src){StringBuilder stringBuilder = new StringBuilder("");if (src == null || src.length <= 0){return null;}for (int i = 0; i < src.length; i++){int v = src[i] & 0xFF;String hv = Integer.toHexString(v);if (hv.length() < 2){stringBuilder.append(0);}stringBuilder.append(hv);}return stringBuilder.toString();}}