//图片到byte数组

   public byte[] image2byte(String path){

     byte[] data = null;

     FileImageInputStream input = null;

     try {

       input = new FileImageInputStream(new File(path));

       ByteArrayOutputStream output = new ByteArrayOutputStream();

       byte[] buf = new byte[1024];

       int numBytesRead = 0;

       while ((numBytesRead = input.read(buf)) != -1) {

       output.write(buf, 0, numBytesRead);

       }

       data = output.toByteArray();

       output.close();

       input.close();

     }

     catch (FileNotFoundException ex1) {

       ex1.printStackTrace();

     }

     catch (IOException ex1) {

       ex1.printStackTrace();

     }

     return data;

   }

   //byte数组到图片

   public void byte2image(byte[] data,String path){

     if(data.length<3||path.equals("")) return;

     try{

     FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));

     imageOutput.write(data, 0, data.length);

     imageOutput.close();

     System.out.println("Make Picture success,Please find image in " + path);

     } catch(Exception ex) {

       System.out.println("Exception: " + ex);

       ex.printStackTrace();

     }

   }

   //byte数组到16进制字符串

   public String byte2string(byte[] data){

     if(data==null||data.length<=1) return "0x";

     if(data.length>200000) return "0x";

     StringBuffer sb = new StringBuffer();

     int buf[] = new int[data.length];

     //byte数组转化成十进制

     for(int k=0;k<data.length;k++){

       buf[k] = data[k]<0?(data[k]+256):(data[k]);

     }

     //十进制转化成十六进制

     for(int k=0;k<buf.length;k++){

       if(buf[k]<16) sb.append("0"+Integer.toHexString(buf[k]));

       else sb.append(Integer.toHexString(buf[k]));

     }

     return "0x"+sb.toString().toUpperCase();

   }