Java image and byte array conversion example

Example:

//image to byte array
 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 array to image
 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 array to16number string
 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 array to decimal
  for(int k=0;k<data.length;k++{
   buf[k] = data[k] < 0&63;(data[k]+256) : (data[k]);
  }
  //Decimal to hexadecimal conversion
  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();
 } 

File parsing:

FileImageOutputStream is replaced with FileOutputStream
Replace FileImageInputStream with FileInputStream

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