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/**运行方法：
  *java  ImageSizer  你的输入文件.jpg 你的输出文件.jpg 200 0.5
  */
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;

// com.sun.image.codec.jpeg package is included
  //in sun and ibm sdk 1.3
import com.sun.image.codec.jpeg.*;

/**
  * Use this class to size images.
  *
  * @author Dan Becker
  */  
  
   
   
   

   
  


public class ImageSizer {
public static final MediaTracker tracker = new MediaTracker( new Component() {} );
    /** Adjusts the size of the image to the given coordinates.
      * If width or height is -1, the image aspect ration is maintained.
      */
    public static Image setSize( Image image, int width, int height ) {
       return setSize( image, width, height, java.awt.Image.SCALE_DEFAULT );
    } // setSize

    /** Adjusts the size of the image to the given coordinates.
      * If width or height is -1, the image aspect ration is maintained.
      * <p>
      * Hints are one of SCALE_DEFAULT, SCALE_FAST, SCALE_SMOOTH,
      * SCALE_REPLICATE, SCALE_AREA_AVERAGING as defined in java.awt.Image.
      */
    public static Image setSize( Image image, int width, int height, int hints ) {
       return image.getScaledInstance( width, height, hints );
    } // setSize

    /** Checks the given image for valid width and height. */
    public static void checkImage( Image image ) {
       waitForImage( image );
       int imageWidth = image.getWidth( null );
       if ( imageWidth < 1 )  
          throw new IllegalArgumentException( "image width " + imageWidth + " is out of range" );
       int imageHeight = image.getHeight( null );
       if ( imageHeight < 1 )  
          throw new IllegalArgumentException( "image height " + imageHeight + " is out of range" );
       // System.out.println( "Image size=" + imageWidth + "x" + imageHeight );
    } // checkImage

    /** Waits for given image to load. Use before querying image height/width/colors. */
    public static void waitForImage( Image image ) {
       try {
          tracker.addImage( image, 0 );
          tracker.waitForID( 0 );
          // loadStatus = tracker.statusID( 0, false );
          tracker.removeImage(image, 0);
       } catch( InterruptedException e ) { e.printStackTrace(); }
    } // waitForImage

    /** Encodes the given image at the given quality to the output stream. */
    public static void encodeJPEG( OutputStream outputStream, Image outputImage, float outputQuality )  
       throws java.io.IOException {
       int outputWidth  = outputImage.getWidth( null );
       if ( outputWidth < 1 )  
          throw new IllegalArgumentException( "output image width " + outputWidth + " is out of range" );
       int outputHeight = outputImage.getHeight( null );
       if ( outputHeight < 1 )  
          throw new IllegalArgumentException( "output image height " + outputHeight + " is out of range" );

       // Get a buffered image from the image.
       BufferedImage bi = new BufferedImage( outputWidth, outputHeight,
          BufferedImage.TYPE_INT_RGB );                                                   
       Graphics2D biContext = bi.createGraphics();
       biContext.drawImage( outputImage, 0, 0, null );
       // Note that additional drawing such as watermarks or logos can be placed here.

       // com.sun.image.codec.jpeg package is included in sun and ibm sdk 1.3
       JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( outputStream );
       // The default quality is 0.75.
       JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam( bi );
       jep.setQuality( outputQuality, true );
       encoder.encode( bi, jep );
       // encoder.encode( bi );
       outputStream.flush();      
    } // encodeImage

    /** Test program */
    public static void main( String [] args )
       throws java.io.IOException {
       if (args.length < 4) {
          System.out.println( "ImageSizer - changes the size of an image." );
          System.out.println( "use: java ImageSizer inputFile outputFile outputWidth outputQuality" );
          return;
       }
       // Gather input arguments.
       String inputFileName = args[ 0 ];
       String outputFileName = args[ 1 ];
       int outputWidth = Integer.parseInt( args[ 2 ] );
       if ( outputWidth < 1 )  
          throw new IllegalArgumentException( "output width "" + args[ 2 ] +"" out of range" );
       float outputQuality = Float.parseFloat( args[ 3 ] );
       if (( outputQuality < 0.0F ) || ( outputQuality > 1.0F ))
          throw new IllegalArgumentException( "output quality "" + args[ 3 ] +"" out of range" );

       // Get input image
       Image inputImage = Toolkit.getDefaultToolkit().getImage( inputFileName );
       checkImage( inputImage );
       // System.out.println( "Input image size=" + inputImage.getWidth( null ) + "x" + inputImage.getHeight( null ) );

       // Create output image.
       Image outputImage = ImageSizer.setSize( inputImage, outputWidth, -1 );
       checkImage( outputImage );
       // System.out.println( "Output image size=" + outputImage.getWidth( null ) + "x" + outputImage.getHeight( null ) );

       // Encode JPEG file.
       FileOutputStream fos = new FileOutputStream( outputFileName );
       encodeJPEG( fos, outputImage, outputQuality );
       fos.close();
       // For some reason, the MediaTracker/ImageProducer likes to hang on.
       System.exit( 0 );
    } // main
} // class ImageSizer

  

  
  
   
   

     
   

     
   
  



源码下载：http://file.javaxxz.com/2014/10/31/235717187.zip