JAVA缩放图片

JAVA缩放图片
2008年06月25日 星期三 上午 10:29

    import java.awt.Image;   
      
    import java.awt.image.BufferedImage;   
    import java.awt.image.RenderedImage;   
    import java.io.File;   
    import java.io.FileOutputStream;   
    import java.io.IOException;   
    import javax.imageio.ImageIO;   
      
    import com.sun.image.codec.jpeg.JPEGCodec;   
    import com.sun.image.codec.jpeg.JPEGImageEncoder;   
      
    public class ImgManager1 {   
      
        public static void main(String args[]) {   
             ImgManager1.reduceImgGif("c:/testgif.gif", "c:/xufnew/test02.gif", 150, 200);   
      
         }   
      
        /**
          * 图像缩放 jpg格式
          *
          * @param imgsrc
          *             :原图片文件路径
          * @param imgdist
          *             :生成的缩略图片文件路径
          * @param widthdist

          *             :生成图片的宽度
          * @param heightdist
          *             :生成图片的高度
          */  
        public static void reduceImg(String imgsrc, String imgdist, int widthdist,   
                int heightdist) {   
            try {   
                 File srcfile = new File(imgsrc);   
                if (!srcfile.exists()) {   
                    return;   
                 }   
                 Image src = ImageIO.read(srcfile);   
      
                 BufferedImage tag = new BufferedImage((int) widthdist,   
                         (int) heightdist, BufferedImage.TYPE_INT_RGB);   
                /*
                  * Image.SCALE_SMOOTH 的缩略算法   生成缩略图片的平滑度的
                  * 优先级比速度高 生成的图片质量比较好 但速度慢
                  */  
                 tag.getGraphics().drawImage(   
                         src.getScaledInstance(widthdist, heightdist,   
                                 Image.SCALE_SMOOTH), 0, 0, null);   
                   
                 FileOutputStream out = new FileOutputStream(imgdist);   
                 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
                 encoder.encode(tag);   
                 out.close();   
      
             } catch (IOException ex) {   
                 ex.printStackTrace();