Java 图片与byte数组互相转换实例

//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(); }