图片和16进制 互相转换

/**
* 图片转十六进制
/
public static class ImageToHex {
public static void main(String[] args) throws Exception {
try {
StringBuffer sb = new StringBuffer();
FileInputStream fis = new FileInputStream(“C:\Users\wb-wsj429645\Desktop\RZE.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(“C:\Users\wb-wsj429645\Desktop\RZE.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
     *
     * @param b
     * @return
     */
    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();
    }
}

===================================================================

/**

• 十六进制转图片
  */
  class Hex2Image {
  public static void main(String[] args) throws Exception {
  Hex2Image to = new Hex2Image();
  InputStream is = new FileInputStream(“C:\Users\wb-wsj429645\Desktop\RZE.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(), “C:\Users\wb-wsj429645\Desktop\qqq.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;
  }
  }