java将图片切割成规定比例并将其压缩成固定大小

import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.Graphics;
import java.awt.color.ColorSpace;
import javax.imageio.ImageIO;

public class ImageCutUtil {

public static void scale(String srcImageFile, double standardWidth,
    double standardHeight) {
   try {
    BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件

    Image image = src.getScaledInstance((int) standardWidth,
      (int) standardHeight, Image.SCALE_DEFAULT);
    BufferedImage tag = new BufferedImage((int) standardWidth,
      (int) standardHeight, BufferedImage.TYPE_INT_RGB);
    Graphics g = tag.getGraphics();
    g.drawImage(image, 0, 0, null);
    g.dispose();
    ImageIO.write(tag, "JPG", new File(srcImageFile + "name.JPG"));// 输出到文件流
   } catch (IOException e) {
    e.printStackTrace();
   }
}

public static void cut(String srcImageFile, double standardWidth,
    double standardHeight) {
   try {
    Image img;
    ImageFilter cropFilter;
    // 读取源图像
    BufferedImage bi = ImageIO.read(new File(srcImageFile));
    int srcWidth = bi.getWidth(); // 源图宽度
    int srcHeight = bi.getHeight(); // 源图高度
    if (srcWidth > standardWidth && srcHeight > standardHeight) {
     Image image = bi.getScaledInstance(srcWidth, srcHeight,
       Image.SCALE_DEFAULT);
     int w = 0;
     int h = 0;

     double wScale = srcWidth / standardWidth;
     double hScale = srcHeight / standardHeight;
     int srcWidth2;
     int srcHeight2;
     if (wScale > hScale) {

      srcWidth2 = (int) (standardWidth * hScale);
      w = (srcWidth - srcWidth2) / 2;
      srcWidth = srcWidth2;
      h = 0;
     } else {
      srcHeight2 = (int) (standardHeight * wScale);
      h = (srcHeight - srcHeight2) / 2;
      srcHeight = srcHeight2;
      w = 0;
     }

     cropFilter = new CropImageFilter(w, h, srcWidth, srcHeight);
     img = Toolkit.getDefaultToolkit().createImage(
       new FilteredImageSource(image.getSource(), cropFilter));
     BufferedImage tag = new BufferedImage(srcWidth, srcHeight,
       BufferedImage.TYPE_INT_RGB);
     Graphics g = tag.getGraphics();
     g.drawImage(img, 0, 0, null);
     g.dispose();
     ImageIO.write(tag, "JPEG", new File(srcImageFile));
     scale(srcImageFile, standardWidth, standardHeight);
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
}

public static void main(String[] args) {
   cut("f:/xxde.jpg", 200, 100);
}
}