java - 如何在套接字连接中下载图像并删除不需要的字节

Question

我需要通过套接字连接下载图像。目前我有一个字节数组，其中包含 .jpg 文件以及其他一些不需要的字节(ffd8)。我需要从字节数组中删除这些不需要的字节。我尝试在不删除字节的情况下下载文件，然后得到格式损坏的图像。所以我想知道如何从字节数组中删除不需要的字节。

在我的代码中:

  while (!status) {
                        byte[] buffer = new byte[1024]; // or 4096, or more
                        int bytesRead = input.read(buffer, 0, buffer.length);
                        int availableBytes = input.available();

                        str2 = str2.append(bytesRead);
                        ImageDataArray = concat(ImageDataArray, buffer);
                        countPackets = countPackets + buffer.length;
                        if (input.available() != 0) {
                            System.out.println("String:" + str1.toString());
                        } else break;
                    }
                    System.out.println("--------------------out of while ------------------");
                    File file = new File(Environment.getExternalStorageDirectory().getAbsoluteFile(), "/SteelmanPro/1020/images/image" +filename1);
                    if (!file.exists()) {
                        file.createNewFile();
                    }
                }
                write(ImageDataArray, Environment.getExternalStorageDirectory().getAbsoluteFile() + "/SteelmanPro/1020/images/image" +filename1);

concat() 方法:

 public  byte[] concat(byte[]...arrays)
{
    // Determine the length of the result array
    int totalLength = 0;
    for (int i = 0; i < arrays.length; i++)
    {
        totalLength += arrays[i].length;
    }

    // create the result array
    byte[] result = new byte[totalLength];

    // copy the source arrays into the result array
    int currentIndex = 0;
    for (int i = 0; i < arrays.length; i++)
    {
        System.arraycopy(arrays[i], 0, result, currentIndex, arrays[i].length);
        currentIndex += arrays[i].length;
    }

    return result;
}

写入方法:

 void write(byte[] aInput, String aOutputFileName) {

    Log.e("dfd", "Writing binary file...");
    try {
        OutputStream output = null;
        try {
            output = new BufferedOutputStream(new FileOutputStream(aOutputFileName));
            output.write(aInput);
        } finally {
            if (output != null)
                output.close();
        }
    } catch (FileNotFoundException ex) {
        Log.e("dfd", "File not found.");
    } catch (IOException ex) {
        Log.e("dfd", "" + ex);
    }
}

Answer 1

Which contains a .jpg file also some other unwanted bytes (ffd8) I tried to download the file without removing the bytes then I got image in corrupted format

由于删除 FFD8 会让您最终损坏，并且您仍然尝试这样做，需要发生什么才能让您停止认为“不需要的”字节实际上是“非常需要”的？ (双关语)

事实上 FF D8 FF 是 JPEG 的 magic number并且是 JPEG 文件的一部分。

https://en.wikipedia.org/wiki/JPEG