imageutils.java

一些公用的Java函数

/*
 * ImageUtils.java
 * 
 * Created on 2007-11-6, 14:58:52
 * 
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.s7turn.sdk.utils;

import com.sun.jimi.core.Jimi;
import com.sun.jimi.core.JimiException;
import com.sun.jimi.core.raster.JimiRasterImage;
import java.awt.Image;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author Long
 */
public class ImageUtils 
{
    private static Log logger = LogFactory.getLog( ImageUtils.class );
    public static boolean resizeImage( byte[] bufferImage, int width, int height, String outputType, OutputStream output )
    {
        OutputStream bufferOutput = null;
        try
        {
            InputStream imageStream = new ByteArrayInputStream ( bufferImage );
            Image img = Jimi.getImage( imageStream );

            int orgWidth = img.getWidth(null);
            int orgHeight = img.getHeight(null);
            float Wscale = (float) width / (float) orgWidth;
            float Hscale = (float) height / (float) orgHeight;
            float scale = Wscale > Hscale ? Hscale : Wscale;
            
            Image scaledImage = img.getScaledInstance((int) (orgWidth * scale), (int) ( orgHeight * scale ), Image.SCALE_SMOOTH );
            JimiRasterImage raster = Jimi.createRasterImage( scaledImage.getSource() );
            bufferOutput = new BufferedOutputStream( output );
            Jimi.putImage( outputType, raster, bufferOutput);
        }
        catch (JimiException ex)
        {
            logger.error(ex.getMessage(), ex);
            return false;
        }
        finally
        {
            if( bufferOutput != null )
            {
                try{ 
                    bufferOutput.flush();
                    bufferOutput.close();
                }catch(Exception e){}
            }
        }
        return true;
    }
    
    
    public static boolean resizeImage(byte[] bufferImage, int width, int height,  OutputStream output)
    {
        return resizeImage( bufferImage, width, height, "image/jpeg", output );
    }            
}