Java gif图片转换为jpg格式

 if(fileName.toLowerCase().endsWith(".gif")){//由于头像上传支持JPG、JPEG、BMP、GIF、PNG格式图片.而商汤人脸设备仅支持JPG、JPEG、BMP、PNG,故如图片为GIF格式需要转换 fileParams.put("avatarFile", api.GifToJpg(avatar_file)); }else{ fileParams.put("avatarFile", api.getBytes(avatar_file)); }

 /** * 将文件转换为byte二进制流 * @param f * @return */ public static byte[] getBytes(File f) { try { InputStream in = new FileInputStream(f); ByteArrayOutputStream out = new ByteArrayOutputStream(1024); byte[] b = new byte[1024]; int n; while ((n = in.read(b)) != -1) out.write(b, 0, n); in.close(); out.close(); return out.toByteArray(); } catch (IOException e) { logger.error("***请设置文件路径***"); e.printStackTrace(); } return null; } /** * 将gif格式图片转换为jpg格式文件，并直接返回byte二进制流 * @param file * @return */ public static byte[] GifToJpg(File file){ BufferedImage bufferedImage; ByteArrayOutputStream out = new ByteArrayOutputStream(1024); try { // read image file bufferedImage = ImageIO.read(file); // create a blank, RGB, same width and height, and a white BufferedImage newBufferedImage = new BufferedImage( bufferedImage.getWidth(), bufferedImage.getHeight(), BufferedImage.TYPE_INT_RGB); // TYPE_INT_RGB:创建一个RBG图像，24位深度，成功将32位图转化成24位 newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0,Color.WHITE, null); // write to jpeg file ImageIO.write(newBufferedImage, "jpg",out);//转换输出到二进制数组流 //ImageIO.write(newBufferedImage, "jpg",new File("c:\\java.jpg-600"));//转换输出到文件 return out.toByteArray();//二进制流 } catch (IOException e) { logger.error("***GifToJpg方法报错***"); e.printStackTrace(); } return null; }

 import java.awt.Color; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class ConvertImageFile { public static void main(String[] args) { BufferedImage bufferedImage; try { //read image file bufferedImage = ImageIO.read(new File("c:\\java.png-600")); // create a blank, RGB, same width and height, and a white background BufferedImage newBufferedImage = new BufferedImage(bufferedImage.getWidth(), bufferedImage.getHeight(), BufferedImage.TYPE_INT_RGB); //TYPE_INT_RGB:创建一个RBG图像，24位深度，成功将32位图转化成24位 newBufferedImage.createGraphics().drawImage(bufferedImage, 0, 0, Color.WHITE, null); // write to jpeg file ImageIO.write(newBufferedImage, "jpg", new File("c:\\java.jpg-600")); System.out.println("Done"); } catch (IOException e) { e.printStackTrace(); } } }