java - 以编程方式更改 BMP 文件

Question

我想加载一个 bmp 文件(用 Java 语言)并在 java 程序的语法中操作图像数据。我怎样才能做到这一点？我尝试只加载图像，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，它并不真正存在。我在这方面是个菜鸟，所以任何正确方向的观点都会受到赞赏。

这是输出:

START
IN loadBMPFile
BM¸U

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

END

我有一个十六进制阅读器(Frhed)，可以将这些字符格式化为十六进制格式，我希望我可以将它们放入数组列表中并从那里操作它们。

这是十六进制读取器输出:

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Answer 1

使用javax.imageio.ImageIO .

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

BufferedImage 也可以更改，因此非常适合修改。