自己写了一个imagebuffer 转 bmp 流的代

try {
   BufferedImage bi = null;
   if (isURL == true) {
    bi = ImageIO.read(new URL(inFileName));
   }
   else {

http://www.gaodaima.com/?p=44748自己写了一个imagebuffer 转 bmp 流的代

    bi = ImageIO.read(new File(inFileName));
   }
   
   int[] rgbArray = new int[101 * 29];//我测试用的图象文件象素值宽度是101宽，29长的
   
   bi.getRGB(0, 0, 101, 29, rgbArray, 0, 101);
   for (int i = 0; i < 101 * 29; i++) {//我做的只是双色图，所以这里查出每一个象素是1(黑)还是0(白)
    if ((rgbArray[i] & 0xffffff) == 0x000000)
     rgbArray[i] = 0;
    else
     rgbArray[i] = 1;
   }
   //以下是BMP文件格式的定义，更加具体的说明可以到http://www.wotsit.org找
   int[] identifier = { ‘B’, ‘M’ };
   int[] fileSize = { 0x0E, 0x02, 0x00, 0x00 };
   int[] reserved = { 0x00, 0x00, 0x00, 0x00 };
   int[] bitmapDataOffset = { 0x3E, 0x00, 0x00, 0x00 };
   int[] bitmapHeaderSize = { 0x28, 0x00, 0x00, 0x00 };
   int[] width = { 0x65, 0x00, 0x00, 0x00 };
   int[] height = { 0x1D, 0x00, 0x00, 0x00 };
   int[] planes = { 0x01, 0x00 };
   int[] bitsPerPixel = { 0x01, 0x00 };
   int[] compression = { 0x00, 0x00, 0x00, 0x00 };
   int[] bitmapDataSize = { 0xD0, 0x01, 0x00, 0x00 };
   int[] hResolution = { 0x00, 0x00, 0x00, 0x00 };
   int[] vResolution = { 0x00, 0x00, 0x00, 0x00 };
   int[] colors = { 0x00, 0x00, 0x00, 0x00 };
   int[] importantColors = { 0x00, 0x00, 0x00, 0x00 };
   int[] palette = { 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x00 };
   //记住bmp没一个扫描行都要扩充到下一个4bytes的倍数，如101就要变成128，扩充的byte补0即可
   int[] bitmapData = new int[(101 + 27) * 29 / 8];
   int n = 0;
   for (int i = 0; i < 29; i++) { //BMP格式是从最后一行开始scan的
    for (int j = 1; j <= 101; j++) {
     if (rgbArray[(28 – i) * 101 + j – 1] == 1) {
      bitmapData[n] = bitmapData[n] | (1 << (8 – j % 8) % 8);
     }
     if (j % 8 == 0) {
      n++;
     }
     if (j == 101) {
      n += 4;
     }
    }
   }
   RandomaccessFile o = new RandomAccessFile(outFileName, "rw");
   o.setLength(0);
   for (int i = 0; i < identifier.length; i++) {
    o.write(identifier[i]);
   }
   for (int i = 0; i < fileSize.length; i++) {
    o.write(fileSize[i]);
   }
   for (int i = 0; i < reserved.length; i++) {
    o.write(reserved[i]);
   }
   for (int i = 0; i < bitmapDataOffset.length; i++) {
    o.write(bitmapDataOffset[i]);
   }
   for (int i = 0; i < bitmapHeaderSize.length; i++) {
    o.write(bitmapHeaderSize[i]);
   }
   for (int i = 0; i < width.length; i++) {
    o.write(width[i]);
   }
   for (int i = 0; i < height.length; i++) {
    o.write(height[i]);
   }
   for (int i = 0; i < planes.length; i++) {
    o.write(planes[i]);
   }
   for (int i = 0; i < bitsPerPixel.length; i++) {
    o.write(bitsPerPixel[i]);
   }
   for (int i = 0; i < compression.length; i++) {
    o.write(compression[i]);
   }
   for (int i = 0; i < bitmapDataSize.length; i++) {
    o.write(bitmapDataSize[i]);
   }
   for (int i = 0; i < hResolution.length; i++) {
    o.write(hResolution[i]);
   }
   for (int i = 0; i < vResolution.length; i++) {
    o.write(vResolution[i]);
   }
   for (int i = 0; i < colors.length; i++) {
    o.write(colors[i]);
   }
   for (int i = 0; i < importantColors.length; i++) {
    o.write(importantColors[i]);
   }
   for (int i = 0; i < palette.length; i++) {
    o.write(palette[i]);
   }
   for (int i = 0; i < bitmapData.length; i++) {
    o.write(bitmapData[i]);
   }
   o.close();
  }
  catch (MalformedURLException e) {
   e.printStackTrace();
  }
  catch (IOException e) {
   e.printStackTrace();   
  }

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