Java实例开发01-01 屏幕捕获工具

知识点：

1.Swing （使用eclipse插件Jigloo开发）

2.JPEG编码器

 

源码：

package chapter01.sample01;import java.awt.Dimension;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;@SuppressWarnings("restriction")
public class CaptureScreen extends javax.swing.JFrame {private static final long serialVersionUID = -2726631763599696338L;private JMenuBar jMenuBar1;private JMenuItem jMenuItemClear;private JScrollPane jScrollPaneGloba;private JLabel jLabelShow;private JMenuItem jMenuItemExit;private JMenuItem jMenuItemSaveAs;private JMenuItem jMenuItemCapture;private JMenu jMenu1;private JFileChooser fileChooser = new JFileChooser();// 文件选择器private JPEGImageEncoder encoder = null;// JPEG编码器private Image tempImage = null;/**
     * Auto-generated main method to display this JFrame
     */public static void main(String[] args) {SwingUtilities.invokeLater(new Runnable() {public void run() {CaptureScreen inst = new CaptureScreen();inst.setLocationRelativeTo(null);inst.setVisible(true);}});}public CaptureScreen() {super();initGUI();}private void initGUI() {try {setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);this.setTitle("CaptrueScreenTool");getContentPane().setLayout(null);{jScrollPaneGloba = new JScrollPane();getContentPane().add(jScrollPaneGloba);// jScrollPaneGloba.setBounds(0, 0, 384, 234);//不能这样子，否则还是窗体扩大了就会显示不全jScrollPaneGloba.setBounds(0, 0, Toolkit.getDefaultToolkit().getScreenSize().width, Toolkit.getDefaultToolkit().getScreenSize().height);{jLabelShow = new JLabel();jScrollPaneGloba.setViewportView(jLabelShow);// 面板的Viewport属性}}{jMenuBar1 = new JMenuBar();setJMenuBar(jMenuBar1);jMenuBar1.setSize(384, 30);jMenuBar1.setPreferredSize(new java.awt.Dimension(384, 30));{jMenu1 = new JMenu();jMenuBar1.add(jMenu1);jMenu1.setText("\u64cd\u4f5c");{jMenuItemCapture = new JMenuItem();jMenu1.add(jMenuItemCapture);jMenuItemCapture.setText("\u622a\u5c4f");jMenuItemCapture.setAccelerator(KeyStroke.getKeyStroke("shift ctrl pressed P"));jMenuItemCapture.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {jMenuItemCaptureActionPerformed(evt);}});}{jMenuItemSaveAs = new JMenuItem();jMenu1.add(jMenuItemSaveAs);jMenuItemSaveAs.setText("\u4fdd\u5b58");jMenuItemSaveAs.setAccelerator(KeyStroke.getKeyStroke("shift pressed S"));jMenuItemSaveAs.setEnabled(false);jMenuItemSaveAs.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {saveImage();}});}{jMenuItemClear = new JMenuItem();jMenu1.add(jMenuItemClear);jMenuItemClear.setText("\u6e05\u7a7a");jMenuItemClear.setAccelerator(KeyStroke.getKeyStroke("shift ctrl pressed C"));jMenuItemClear.setEnabled(false);jMenuItemClear.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {jMenuItemClearActionPerformed(evt);}});}{jMenuItemExit = new JMenuItem();jMenu1.add(jMenuItemExit);jMenuItemExit.setText("\u9000\u51fa");jMenuItemExit.setAccelerator(KeyStroke.getKeyStroke("shift ctrl pressed X"));jMenuItemExit.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent evt) {jMenuItemExitActionPerformed(evt);}});}}}pack();setSize(400, 300);} catch (Exception e) {e.printStackTrace();}}private void jMenuItemCaptureActionPerformed(ActionEvent evt) {tempImage = this.createImage();jLabelShow.setIcon(new ImageIcon(tempImage));jMenuItemCapture.setEnabled(false);jMenuItemSaveAs.setEnabled(true);jMenuItemClear.setEnabled(true);}// 截屏 ：这里是重点，保存图片private Image createImage() {try {Image tempLocalImage = null;Robot robot = new Robot();Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();Rectangle scrRectangle = new Rectangle(0, 0, dimension.width, dimension.height);tempLocalImage = robot.createScreenCapture(scrRectangle);return tempLocalImage;} catch (Exception e) {e.printStackTrace();}return null;}// 保存 ：这里是保存图片的代码private void saveImage() {try {int save = fileChooser.showSaveDialog(this);// Pops up a "Save File" file chooser dialog.if (save == JFileChooser.APPROVE_OPTION) {// 点击了OK（或者Yes）// 获取要设置的文件名（包括路径）File saveFileName = fileChooser.getSelectedFile();// 获取要保存文件的名字String fileName = new String(saveFileName.getPath() + ".jpg");// abstract pathname// 1.首先创建一个输出流FileOutputStream fileOutputStream = new FileOutputStream(fileName);// 2.然后把输出流用JPEG编码器进行包裹，其实就是把输出流连接到编码器encoder = JPEGCodec.createJPEGEncoder(fileOutputStream);// 把BufferedImage对象进行编码encoder.encode((BufferedImage) tempImage);fileOutputStream.flush();// 清空缓存fileOutputStream.close();}} catch (Exception e) {e.printStackTrace();}}// 清空private void jMenuItemClearActionPerformed(ActionEvent evt) {jLabelShow.setIcon(null);jMenuItemCapture.setEnabled(true);jMenuItemClear.setEnabled(false);jMenuItemSaveAs.setEnabled(false);}// 退出private void jMenuItemExitActionPerformed(ActionEvent evt) {System.exit(0);}}

显示效果：

 

截出来的图片：当时的整个屏幕的图片

http://www.cnblogs.com/yinger/archive/2011/09/03/2165883.html