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.ByteArrayInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.util.HashMap; import java.util.Map; /** * 十六进制转成图片 * @author Administrator * */ public class Hex2Image { public static void main(String[] args) throws Exception { Hex2Image to=new Hex2Image(); InputStream is=new FileInputStream("f://aa.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(),"f://dd.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.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; /** * 图片转成十六进制 * @author Administrator * */ public class ImageToHex { public static void main(String[] args) throws Exception { try{ StringBuffer sb = new StringBuffer(); FileInputStream fis = new FileInputStream("f:/345.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("f://today.txt")); pw.println(str); pw.close(); }catch(IOException e){ } } /* * 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; else hs=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(); } }