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Java读取BMP文件

各位老大，帮我看看代码

         //  The DataInputStream allows you to read in 16 and 32 bit numbers
        DataInputStream in  =   new  DataInputStream(instream);
        DataOutputStream out = new  DataOutputStream(outstream);

         //  Verify that the header starts with 'BM'
         if  (in.read()  !=   ' B ' )  {
             throw   new  IOException( " Not a .BMP file " );
        }
        out.write( ' B ' );
        
         if  (in.read()  !=   ' M ' )  {
             throw   new  IOException( " Not a .BMP file " );
        }
        out.write( ' M ' );
        
         //      Get the total file size
         int  fileSize  =  intelInt(in.readInt());
        out.writeInt(intelInt(fileSize));

         //      Skip the 2 16-bit reserved words
        out.writeShort(in.readUnsignedShort());
        out.writeShort(in.readUnsignedShort());

         int  bitmapOffset  =  intelInt(in.readInt());
        out.writeInt(intelInt(bitmapOffset));
         int  bitmapInfoSize  =  intelInt(in.readInt());
        out.writeInt(intelInt(bitmapInfoSize));
        
         int  width  =  intelInt(in.readInt());
        out.writeInt(intelInt(width));
         int  height  =  intelInt(in.readInt());
        out.writeInt(intelInt(height));
        
 //  Skip the 16-bit bitplane size
        out.writeShort(in.readUnsignedShort());
         int  bitCount  =  intelShort(in.readUnsignedShort());
        out.writeShort(intelShort(bitCount));
         int  compressionType  =  intelInt(in.readInt());
        out.writeInt(intelInt(compressionType));
         int  imageSize  =  intelInt(in.readInt());
        out.writeInt(intelInt(imageSize));
 //  Skip pixels per meter
        out.writeInt(in.readInt());
        out.writeInt(in.readInt());

         int  colorsUsed  =  intelInt(in.readInt());
        out.writeInt(intelInt(colorsUsed));
         int  colorsImportant  =  intelInt(in.readInt());
        out.writeInt(intelInt(colorsImportant));
        System.out.println( " [colorused]= " + colorsUsed);

 //  Read the pixels from the stream based on the compression type
         if  (compressionType  ==  BI_RGB)  {
             if  (bitCount  ==   24 )  {
                readRGB24(width, height, in, out);
            }
        }  
    }


     protected   static   void  readRGB24( int  width,  int  height,
        DataInputStream in, OutputStream out)
     throws  IOException
     {

 //  Start storing at the bottom of the array
         for  ( int  h  =  height - 1 ; h  >=   0 ; h -- )  {
          for  ( int  w  =   0 ; w  <  width; w ++ )  {

 //  Read in the red, green, and blue components
           int  red  =  in.read();
           int  green  =  in.read();
           int  blue  =  in.read();
          out.write(red);
          out.write(green);
          out.write(blue);
            }
        }
    }

posted on 2006-06-06 10:29 david.turing 阅读(1831) 评论(2)  编辑  收藏

评论

# re: Java读取BMP文件 2007-11-07 17:45 zouni

哪里抄过来的代码？  回复  更多评论   

# re: Java读取BMP文件 2007-11-07 17:52 david.turing

我晕，没有publish到blog的文章也能google到？  回复  更多评论   


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