从硬盘读取图片

Image image = null; try {
   // Read from a file         File file = new File("image.gif");         image = ImageIO.read(file); // Read from an input stream         InputStream is = new BufferedInputStream( new FileInputStream("image.gif"));         image = ImageIO.read(is); // Read from a URL         URL url = new URL("http://hostname.com/image.gif");         image = ImageIO.read(url);     } catch (IOException e) {
       } // Use a label to display the image     JFrame frame = new JFrame();     JLabel label = new JLabel(new ImageIcon(image));     frame.getContentPane().add(label, BorderLayout.CENTER);     frame.pack();     frame.setVisible(true);

产生缩略图  和  使两个图片合并到一起

import java.awt.AWTException; import java.awt.Graphics; import java.awt.HeadlessException; import java.awt.Image; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class MyImage extends JFrame{
       @SuppressWarnings("deprecation") public MyImage(){
           JLabel jl = new JLabel(); //Image im = this.getImage();         Image im = null; try {
               im = this.margeImages();         } catch (IOException e) {
   // TODO Auto-generated catch block             e.printStackTrace();         }         ImageIcon ic = new ImageIcon(im);         jl.setIcon(ic); this.add(jl); this.setSize(600,450); this.show();     } public static void main(String[] args){
   new MyImage();     } public Image getImage(){
           Image img = null; try {
   /*              * 截屏并产生缩略图 */             Robot myrobot = new Robot();             BufferedImage bi = myrobot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize())); /*              * 产生缩略图的方法 */             img = bi.getScaledInstance(360, 250, BufferedImage.SCALE_AREA_AVERAGING);             } catch (AWTException e) {
   // TODO Auto-generated catch block             e.printStackTrace();         } return img;     } public Image margeImages() throws IOException{
           BufferedImage b = null;         Image img1 = null;         Image img = null; try {
   /*              * 截全屏 */             b = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));             img = b.getScaledInstance(b.getWidth(), b.getHeight(), BufferedImage.SCALE_SMOOTH);             img1 = b.getScaledInstance(300, 200, BufferedImage.SCALE_SMOOTH);         } catch (HeadlessException e) {
   // TODO Auto-generated catch block             e.printStackTrace();         } catch (AWTException e) {
   // TODO Auto-generated catch block             e.printStackTrace();         } /*          * 获得画布 */         Graphics my_g = b.getGraphics(); /*          * 画另一副图 */         my_g.drawImage(img1, 100, 100, 200, 400,null); //my_g.drawImage(img,0,0,b.getWidth(), b.getHeight(),null);         /*          * 释放相应的资源 */         my_g.dispose(); return img;     } }