gif图片转换为jpg格式 java

可参照 https://blog.csdn.net/huoji555/article/details/79595137

   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"));//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;
    }