Java读取十六进制数转化为图片

来源：互联网发布：软件培训机构排行榜编辑：程序博客网时间：2024/05/07 16:04

最近遇到一个问题，服务器接收到图片转换之后的十六进制数据，怎么还原照片？

不多说，直接上代码：

package com.mybatis.test;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;public class TestImage1 {public static void main(String[] args) throws Exception {/*byte[] b1 =image2Bytes("d:\\1.jpg");//for(int i=0;i<b1.length;i++) b1[i]=Integer.toHexString(b1[i] & 0xFF)System.out.println();FileOutputStream fos=new FileOutputStream("d:\\image.txt");fos.write(b1);fos.close();*/FileInputStream fis=new FileInputStream(new File("d:\\data.txt"));char[] ch=new char[fis.available()];System.out.println(fis.available());int len=fis.available();int j=0;System.out.println();for(int i=0;i<len;i++){int temp=fis.read();char c=(char)temp;if(temp!=32){ch[j++]=c;//System.out.print(c);}}System.out.println();System.out.println(new String(ch,0,j).length());byte[] b=hexStringToBytes(new String(ch,0,j));buff2Image(b,"d:\\test.jpeg");fis.close();} static void buff2Image(byte[] b,String tagSrc) throws Exception    {        FileOutputStream fout = new FileOutputStream(tagSrc);        //将字节写入文件        fout.write(b);        fout.close();    }public static byte[] hexStringToBytes(String hexString) {      if (hexString == null || hexString.equals("")) {          return null;      }      hexString = hexString.toUpperCase();      int length = hexString.length() / 2;      char[] hexChars = hexString.toCharArray();      byte[] d = new byte[length];      for (int i = 0; i < length; i++) {          int pos = i * 2;          d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));      }      return d;  }   private static byte charToByte(char c) {      return (byte) "0123456789ABCDEF".indexOf(c);  }static byte[] image2Bytes(String imgSrc) throws Exception    {        FileInputStream fin = new FileInputStream(new File(imgSrc));        //可能溢出,简单起见就不考虑太多,如果太大就要另外想办法，比如一次传入固定长度byte[]        byte[] bytes  = new byte[fin.available()];        //将文件内容写入字节数组，提供测试的case        fin.read(bytes);        fin.close();        return bytes;    }public static String hexString2binaryString(String hexString)      {          if (hexString == null || hexString.length() % 2 != 0)              return null;          String bString = "", tmp;          for (int i = 0; i < hexString.length(); i++)          {              tmp = "0000"                      + Integer.toBinaryString(Integer.parseInt(hexString                              .substring(i, i + 1), 16));              bString += tmp.substring(tmp.length() - 4);          }          return bString;  }public static String binaryString2hexString(String bString)      {          if (bString == null || bString.equals("") || bString.length() % 8 != 0)              return null;          StringBuffer tmp = new StringBuffer();          int iTmp = 0;          for (int i = 0; i < bString.length(); i += 4)          {              iTmp = 0;              for (int j = 0; j < 4; j++)              {                  iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);              }              tmp.append(Integer.toHexString(iTmp));          }          return tmp.toString();      }  }

项目下载地址：http://download.csdn.net/detail/u010627840/9397491

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