一个效果不错的Java Swing模拟屏幕截图工具类
原理：
点击截图时，获取当前屏幕的图像，然后再这个静态的图像上进行选择操作。
代码：
ScreenShot.java
package com.qiu.util;
import java.awt.AWTException;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.p_w_picpath.BufferedImage;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class ScreenShot extends JFrame {
private static final long serialVersionUID = 1L;
private Image p_w_picpath;
private JLabel p_w_picpathLabel;
private int width = Toolkit.getDefaultToolkit().getScreenSize().width;
private int height = Toolkit.getDefaultToolkit().getScreenSize().height;
private int isExit;
private String filename;
private int x, y, xEnd, yEnd; // 用于记录鼠标点击开始和结束的坐标
/**
*
*
* @param isExit
* 选择是否退出
* 0-- 退出系统
* ！0 -- 只是隐藏
* @param filename
* 截图生成文件名
* @throws AWTException
* @throws InterruptedException
*/
public ScreenShot(int isExit,String filename) throws AWTException, InterruptedException {
this.isExit=isExit;
this.filename=filename;
p_w_picpath = GraphicsUtils.getScreenImage(0, 0, width,
height);
p_w_picpathLabel = new JLabel(new ImageIcon(p_w_picpath));
p_w_picpathLabel.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
createAction();
getContentPane().add(p_w_picpathLabel);
setUndecorated(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setExtendedState(JFrame.MAXIMIZED_BOTH); }
/**
* 实现监听动作
*/
private void createAction() {
p_w_picpathLabel.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.isMetaDown()) {
if(isExit==0){
System.exit(0);
}else{
ScreenShot.this.dispose();
}
}
}
public void mousePressed(MouseEvent e) {
x = e.getX();
y = e.getY();
}
public void mouseReleased(MouseEvent e) {
xEnd = e.getX();
yEnd = e.getY();
try {
p_w_picpath = GraphicsUtils.getScreenImage(Math.min(x, xEnd),
Math.min(y, yEnd), Math.abs(xEnd - x),
Math.abs(yEnd - y));
} catch (AWTException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
// 为了查看截图效果，将区域截图的部分代替全屏的截图展示
p_w_picpathLabel.setIcon(new ImageIcon(p_w_picpath));
/**
休眠1S，为了查看截图区域在全屏的位置
try {
Thread.sleep(1000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
*/
if (p_w_picpath != null) {
new ShowWindow(new ImageIcon(p_w_picpath),isExit,filename);
ScreenShot.this.dispose();
}
}
});
p_w_picpathLabel.addMouseMotionListener(new MouseMotionListener() {
public void mouseDragged(MouseEvent e) {
xEnd = e.getX();
yEnd = e.getY();
BufferedImage bi = new BufferedImage(p_w_picpath.getWidth(null),
p_w_picpath.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
g2d.drawImage(p_w_picpath, 0, 0, null);
g2d.setColor(Color.RED);
g2d.drawRect(Math.min(x, xEnd) - 1, Math.min(y, yEnd) - 1,
Math.abs(xEnd - x) + 1, Math.abs(yEnd - y) + 1);
g2d.dispose();
Graphics g = p_w_picpathLabel.getGraphics();
g.drawImage(bi, 0, 0, null);
g.dispose();
}
public void mouseMoved(MouseEvent e) {
x = e.getX();
y = e.getY();
BufferedImage bi = new BufferedImage(p_w_picpath.getWidth(null),
p_w_picpath.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
g2d.drawImage(p_w_picpath, 0, 0, null);
g2d.setColor(Color.RED);
g2d.drawLine(x, 0, x, height);
g2d.drawLine(0, y,width, y);
g2d.dispose();
Graphics g = p_w_picpathLabel.getGraphics();
g.drawImage(bi, 0, 0, null);
g.dispose();
}
});
}
public static void main(String[] args) throws AWTException,
InterruptedException {
String filename = new SimpleDateFormat("MM-dd-HH-mm-ss").format(new Date())+".png";
new ScreenShot(0,filename);
}
}
class GraphicsUtils {
/**
* 截图屏幕中制定区域的图片
*
* @param x
* @param y
* @param w
* @param h
* @return 被截部分的BufferedImage对象
* @throws AWTException
* @throws InterruptedException
*/
public static BufferedImage getScreenImage(int x, int y, int w, int h)
throws AWTException, InterruptedException {
Robot robot = new Robot();
BufferedImage screen = null;
if(w-x>0){
screen = robot.createScreenCapture(new Rectangle(x, y, w,h));
}
return screen;
}
}
ShowWindow .java
package com.qiu.util;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionAdapter;
import java.awt.p_w_picpath.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.p_w_picpathio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;
public class ShowWindow extends JFrame implements MouseListener{
private static final long serialVersionUID = 1L;
static Point origin = new Point();
private ImageIcon ii;
private JButton save;
private JButton cancel;
private int isExit;
private String filename;
private JFileChooser chooser;
public ShowWindow(ImageIcon ii,int isExit,String filename) {
this.filename=filename;
this.isExit=isExit;
this.ii = ii;
initUI();
initLayout();
setSize(ii.getIconWidth(), ii.getIconHeight() + 30);
setUndecorated(true);
setLocationRelativeTo(null);
WindowMove();
setVisible(true);
}
private void initUI() {
save = new JButton("保存");
cancel = new JButton("取消");
save.addMouseListener(this);
cancel.addMouseListener(this);
chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("JPG & PNG Images", "jpg", "png");
chooser.setFileFilter(filter);
}
private void initLayout() {
JPanel main = new JPanel(new BorderLayout());
main.setBorder(BorderFactory.createLineBorder(Color.BLUE));
JPanel btnpane = new JPanel(new GridLayout(1, 8));
btnpane.add(save);
btnpane.add(cancel);
main.add(new JLabel(ii), BorderLayout.CENTER);
main.add(btnpane, BorderLayout.SOUTH);
add(main);
}
// 窗体移动函数
public void WindowMove() {
// 设置没有标题的窗口可以拖动
this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
origin.x = e.getX(); // 当鼠标按下的时候获得窗口当前的位置
origin.y = e.getY();
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
Point p = getLocation();
setLocation(p.x + e.getX() - origin.x, p.y + e.getY()
- origin.y);
}
});
}
@Override
public void mouseClicked(MouseEvent e) {
if(e.getSource()==cancel){
if(isExit==0){
System.exit(0);
}else{
ShowWindow.this.dispose();
}
}
if(e.getSource()==save){
File file = null;
chooser.setSelectedFile(new File(filename));
int returnVal = chooser.showSaveDialog(ShowWindow.this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
}
Image img = ii.getImage();
try {
if(file != null) {
ImageIO.write((BufferedImage)img, "png", file);
JOptionPane.showMessageDialog(ShowWindow.this, "保存成功", "温馨提示", JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
}
使用方法：在需要用到截图的地方设置监听，在监听中调用new ScreenShot(0, filename);如果是调用的话，isExit参数就不能为0，如果isExit为0，则退出整个系统。
package screenshot;
import java.awt.AWTException;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.qiu.util.ScreenShot;
public class Test {
public static void main(String[] args) {
// 自动生成截图名称
String filename = new SimpleDateFormat("MM-dd-HH-mm-ss")
.format(new Date()) + ".png";
try {
// 调用截图
new ScreenShot(0, filename);
} catch (AWTException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}