Java 图片与byte数组互相转换

小灰灰 2022-05-17 09:51 287阅读 0赞

//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();

文件解析：  
FileImageOutputStream 换成了 FileOutputStream  
FileImageInputStream 换成 FileInputStream

转载于：[https://blog.csdn.net/huang9012/article/details/18241539/][https_blog.csdn.net_huang9012_article_details_18241539]

[https_blog.csdn.net_huang9012_article_details_18241539]: https://blog.csdn.net/huang9012/article/details/18241539/