Java中将组件保存成图片

import java.io.*;import javax.swing.*;import com.sun.image.codec.jpeg.*;public void saveComponentToJPEG(Component c,String fileName ) {      try {          int w=c.getWidth();          int h=c.getHeight();          BufferedImage image=(BufferedImage)c.createImage(w,h);          Graphics2D g2=image.createGraphics();          c.print(g2);          BufferedOutputStream bos =            new BufferedOutputStream( new FileOutputStream( fileName ));          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder( bos );          JPEGEncodeParam jep = encoder.getDefaultJPEGEncodeParam(image);          jep.setQuality( 1.0f, false );          encoder.setJPEGEncodeParam( jep );          encoder.encode( image );          bos.close();      }      catch ( Exception e ) {          e.printStackTrace();      }  }