實例解析Java圖片與byte數組互相轉換

實例如下：

//圖片到byte數組  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數組到圖片  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數組到16進制字符串  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數組轉化成十進制   for(int k=0;k<data.length;k++){    buf[k] = data[k]<0?(data[k]+256):(data[k]);   }   //十進制轉化成十六進制   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();   }

文件解析：

FileImageOutputStream 換成了 FileOutputStream
FileImageInputStream 換成 FileInputStream

相關學習推薦：Java視頻教程