Java 图片格式转换
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.");}}