自己编写的一个BMP图片读取类，使得Java也能支持BMP格式的图片文件。返回值包装成一个Image对象，可以方便地调用。必须使用JDK1.3以上环境。-themselves prepared to read a BMP picture category, enabling Java can also support BMP format image files. Return values packaged as an Image object that can be easily called. JDK1.3 and above must use environment.