以编程方式更改BMP文件

Question

我想加载一个bmp文件（使用Java）并在Java程序的语法内操作图像数据。我怎样才能做到这一点？我试图加载图像，如下所示：

public static void main(String[] args) { 
      System.out.println("START"); 
      loadbitmap lbm = new loadbitmap(); 
      lbm.loadBMPFile(); 
      System.out.println("END"); 
     } 

     private void loadBMPFile() 
     { 
      { 
       try{ 

        FileInputStream fstream = new FileInputStream("sample_fingerprint_grayscale.bmp"); 
        DataInputStream in = new DataInputStream(fstream); 
        BufferedReader br = new BufferedReader(new InputStreamReader(in)); 
        String inputString; 
        while ((inputString = br.readLine()) != null) { 

         readBMPFile.add(inputString); 
        } 
        in.close(); 
       } 
       catch (Exception e){ 
        System.out.println("IN ERROR"); 
        System.err.println("Error: " + e.getMessage()); 
       } 
       System.out.println("IN loadBMPFile"); 
       System.out.println("BMP size is " + readBMPFile.size()); 
       System.out.println(readBMPFile.get(2)); 
      } 
     } 
} 

但是，当我检查数据时，它不是真的存在。我是一个小菜鸟，所以任何点在正确的方向表示赞赏。

这里是输出：

START 
IN loadBMPFile 
BM¸U 

(At this point there is a large amount of gibberish characters that won't paste into Stack Overflow) 

END 

我有一个十六进制读卡器（Frhed），用于格式化这些字符转换成十六进制格式的，我希望我能为他们带来字符转换成一个ArrayList，并从那里操纵它们。

这里是十六进制读者输出：

BM<bh:b8>U<bh:01><bh:00><bh:00><bh:00><bh:00><bh:00>6<bh:04><bh:00><bh:00>(<bh:00><bh:00><bh:00><bh:f0><bh:00><bh:00><bh:00><bh:98><bh:fe><bh:ff><bh:ff><bh:01><bh:00><bh:08><bh:00><bh:00><bh:00><bh:00><bh:00><bh:82>Q<bh:01><bh:00><bh:12><bh:0b><bh:00><bh:00><bh:12><bh:0b><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:00><bh:01><bh:01><bh:01><bh:00><bh:02><bh:02><bh:02><bh:00><bh:03><bh:03><bh:03><bh:00><bh:04><bh:04><bh:04><bh:00><bh:05><bh:05><bh:05><bh:00><bh:06><bh:06><bh:06><bh:00><bh:07><bh:07><bh:07><bh:00><bh:08><bh:08><bh:08><bh:00><bh:09><bh:09><bh:09><bh:00> 


<bh:00><bh:0b><bh:0b><bh:0b><bh:00><bh:0c><bh:0c><bh:0c><bh:00> 


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

Answer 1

使用javax.imageio.ImageIO。

BufferedImage img = ImageIO.read(new File("... .bmp")); 

BufferedImage也可能被改变，所以非常适合修改。