Java 无边框打印屏幕
我想在没有JFrame本身的情况下,对JFrame后面的内容进行打印。我尝试的方法是关闭窗口,等待一段时间使其完全关闭,然后取下打印屏幕,然后再次打开。当前的方法不适合我的需要,因为我需要更频繁地执行此操作,并且等待窗口关闭的时间太长。还有,我不想因此而关上窗户 这是我目前的代码:Java 无边框打印屏幕,java,swing,jframe,screen,desktop,Java,Swing,Jframe,Screen,Desktop,我想在没有JFrame本身的情况下,对JFrame后面的内容进行打印。我尝试的方法是关闭窗口,等待一段时间使其完全关闭,然后取下打印屏幕,然后再次打开。当前的方法不适合我的需要,因为我需要更频繁地执行此操作,并且等待窗口关闭的时间太长。还有,我不想因此而关上窗户 这是我目前的代码: public class Offscreen { private static BufferedImage img; public static void main(String[] main)
public class Offscreen {
private static BufferedImage img;
public static void main(String[] main)
throws AWTException, InterruptedException {
JFrame frame = new JFrame() {
@Override
public void paint(Graphics g) {
if (img != null)
// draw print screen
g.drawImage(img, 0, 0, null);
}
};
frame.setSize(500, 500);
frame.setLocation(700, 0);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setVisible(false);
Thread.sleep(200);
// take the picture
Robot r = new Robot();
img = r.createScreenCapture(frame.getBounds());
// show the source again
frame.setVisible(true);
// print on destiny
frame.repaint();
}
}
“假设”您只想捕获活动帧后面的区域(如您所说,没有帧),然后类似
import java.awt.AWTException;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class PrintScreen01 {
public static void main(String[] args) {
new PrintScreen01();
}
private Timer timer;
public PrintScreen01() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
final PrintPane printPane = new PrintPane();
final JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(printPane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.addComponentListener(new ComponentAdapter() {
@Override
public void componentMoved(ComponentEvent e) {
timer.restart();
}
@Override
public void componentResized(ComponentEvent e) {
timer.restart();
}
});
timer = new Timer(250, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (frame.isVisible()) {
takeSnapShot(frame, printPane);
}
}
});
timer.setRepeats(false);
frame.setVisible(true);
// takeSnapShot(frame, printPane);
}
});
}
public void takeSnapShot(JFrame frame, PrintPane pane) {
Rectangle bounds = new Rectangle(pane.getLocationOnScreen(), pane.getSize());
frame.setVisible(false);
new SnapShotWorker(frame, pane, bounds).execute();
}
public class SnapShotWorker extends SwingWorker<BufferedImage, BufferedImage> {
private JFrame frame;
private PrintPane pane;
private Rectangle captureBounds;
public SnapShotWorker(JFrame frame, PrintPane pane, Rectangle bounds) {
this.frame = frame;
this.pane = pane;
captureBounds = bounds;
}
@Override
protected BufferedImage doInBackground() throws Exception {
Thread.sleep(125);
BufferedImage snapShot = null;
try {
Robot bot = new Robot();
snapShot = bot.createScreenCapture(captureBounds);
} catch (AWTException ex) {
ex.printStackTrace();
}
Thread.sleep(125);
return snapShot;
}
@Override
protected void done() {
try {
BufferedImage snapShot = get();
pane.setSnapShot(snapShot);
frame.setVisible(true);
} catch (InterruptedException ex) {
ex.printStackTrace();
} catch (ExecutionException ex) {
ex.printStackTrace();
}
}
}
public class PrintPane extends JPanel {
private BufferedImage background;
public PrintPane() {
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
public void setSnapShot(BufferedImage img) {
background = img;
repaint();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(0.5f));
g2d.drawImage(background, 0, 0, this);
g2d.dispose();
}
}
}
}
import java.awt.AWTException;
导入java.awt.AlphaComposite;
导入java.awt.BorderLayout;
导入java.awt.Dimension;
导入java.awt.EventQueue;
导入java.awt.Graphics;
导入java.awt.Graphics2D;
导入java.awt.Rectangle;
导入java.awt.Robot;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.awt.event.ComponentAdapter;
导入java.awt.event.ComponentEvent;
导入java.awt.image.buffereImage;
导入java.lang.reflect.InvocationTargetException;
导入java.util.concurrent.ExecutionException;
导入java.util.logging.Level;
导入java.util.logging.Logger;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
导入javax.swing.SwingUtilities;
导入javax.swing.SwingWorker;
导入javax.swing.Timer;
导入javax.swing.UIManager;
导入javax.swing.UnsupportedLookAndFeelException;
公共类PrintScreen01{
公共静态void main(字符串[]args){
新的PrintScreen01();
}
私人定时器;
公共打印屏幕01(){
invokeLater(新的Runnable(){
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}捕获(ClassNotFoundException ex){
}catch(实例化异常){
}捕获(非法访问例外){
}捕获(无支持的LookandFeelexception ex){
}
最终打印窗格打印窗格=新打印窗格();
最终JFrame=新JFrame(“测试”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(新的BorderLayout());
frame.add(打印窗格);
frame.pack();
frame.setLocationRelativeTo(空);
frame.addComponentListener(新的ComponentAdapter(){
@凌驾
公共无效组件已移动(组件事件e){
timer.restart();
}
@凌驾
公共无效组件已恢复(组件事件e){
timer.restart();
}
});
计时器=新计时器(250,新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
if(frame.isVisible()){
拍摄快照(框架、打印窗格);
}
}
});
timer.setRepeats(假);
frame.setVisible(true);
//拍摄快照(框架、打印窗格);
}
});
}
公共void快照(JFrame框架、打印窗格){
矩形边界=新矩形(pane.getLocationOnScreen(),pane.getSize());
frame.setVisible(假);
新建SnapShotWorker(框架、窗格、边界).execute();
}
公共类SnapShotWorker扩展了SwingWorker{
私有JFrame;
私人印刷版;
私有矩形捕获边界;
公共SnapShotWorker(JFrame框架、PrintPane窗格、矩形边框){
this.frame=frame;
this.pane=窗格;
captureBounds=边界;
}
@凌驾
受保护的BuffereImage doInBackground()引发异常{
睡眠(125);
BuffereImage快照=空;
试一试{
机器人机器人=新机器人();
快照=bot.createScreenCapture(captureBounds);
}捕获(AWEX){
例如printStackTrace();
}
睡眠(125);
返回快照;
}
@凌驾
受保护的void done(){
试一试{
BuffereImage快照=获取();
窗格。设置快照(快照);
frame.setVisible(true);
}捕获(中断异常例外){
例如printStackTrace();
}捕获(ExecutionException ex){
例如printStackTrace();
}
}
}
公共类PrintPane扩展了JPanel{
私有缓冲图像背景;
公共打印窗格(){
}
@凌驾
公共维度getPreferredSize(){
返回新维度(200200);
}
公共无效设置快照(BuffereImage img){
背景=img;
重新油漆();
}
@凌驾
受保护组件(图形g){
超级组件(g);
如果(背景!=null){
Graphics2D g2d=(Graphics2D)g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(0.5f));
g2d.drawImage(背景,0,0,this);
g2d.dispose();
}
}
}
}
可能会有帮助
现在,我对机器人的计时有一些问题,似乎部分操作是以某种方式线程化的,这意味着除非你让帧的计时在不可见和可见之间“刚好”改变,否则你实际上会重新捕获帧…令人讨厌
为了尝试解决这个问题,减少捕获屏幕的次数,我使用了javax.swing.Timer
(减少捕获尝试)