package img;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReader;import javax.imageio.ImageWriter;import javax.imageio.stream.FileImageInputStream;import javax.imageio.stream.FileImageOutputStream;public class BmptoTJpeg { public static void main(String[] args) throws Exception { FileImageInputStream fiis = new FileImageInputStream(new File( "c:/4.jpg")); FileImageOutputStream fios = new FileImageOutputStream(new File( "c:/4.BMP")); ImageReader jpegReader = null; Iterator<ImageReader> it1 = ImageIO.getImageReadersByFormatName("jpeg"); if (it1.hasNext()) { jpegReader = it1.next(); } jpegReader.setInput(fiis); ImageWriter bmpWriter = null; Iterator<ImageWriter> it2 = ImageIO.getImageWritersByFormatName("bmp"); if (it2.hasNext()) { bmpWriter = it2.next(); } bmpWriter.setOutput(fios); BufferedImage br = jpegReader.read(0); bmpWriter.write(br); fiis.close(); fios.close(); System.out.println("Jpeg到bmp图片转换完成."); }}
