uiutils.java

开源的OpenId的一个java实现

package org.wso2.solutions.identity.admin.ui;

import java.awt.Container;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class UIUtils {
    
    public static final int WIDTH = 120;
    public static final int HEIGHT = 80;
    
   
   
        
    public static void createThumbnailImageFile(File inFile, String outFileName) throws Exception{
        
        int newWidth = WIDTH;
        int newHeight = HEIGHT;
        
        BufferedInputStream buff = new BufferedInputStream(new FileInputStream(inFile));
        
        Long len = Long.valueOf((inFile.length()));
        byte[] img = new byte[len.intValue()];
        
        buff.read(img);
        
        Image image = Toolkit.getDefaultToolkit().createImage(img);
        MediaTracker tracker = new MediaTracker(new Container());
        tracker.addImage(image, 0);
        tracker.waitForID(0);
        
        double thumbRatio = (double)newWidth / (double)newHeight;
        int imageWidth = image.getWidth(null);
        int imageHeight = image.getHeight(null);
        double imageRatio = (double)imageWidth / (double)imageHeight;
        
        if (thumbRatio < imageRatio) {
          newHeight = (int)(newWidth / imageRatio);
        } else {
          newWidth = (int)(newHeight * imageRatio);
        }
     
        BufferedImage thumbImage = new BufferedImage(newWidth, 
          newHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2D = thumbImage.createGraphics();
        g2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
          RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        
        g2D.drawImage(image, 0, 0, newWidth, newHeight, null);
     
        BufferedOutputStream out = new BufferedOutputStream(new
          FileOutputStream(outFileName));
        JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam param = enc.
          getDefaultJPEGEncodeParam(thumbImage);
        int quality = 75;
        quality = Math.max(0, Math.min(quality, 100));
        param.setQuality((float)quality / 100.0f, false);
        enc.setJPEGEncodeParam(param);
        enc.encode(thumbImage);
        out.close(); 

      }
}