每当客户端单击打印屏幕按钮时,我需要捕获一个网页屏幕以将其存储在客户端的机器上。为此,我用谷歌搜索并通过在我的 jsp 页面中嵌入一个带有签名的小程序(受信任的小程序)来获得它,我可以做到这一点。因此,我正在尝试为独立的 java 类使用一个简单的小程序。成功后,我可以在签署小程序后尝试 jsp。我尝试的是:
import java.applet.Applet;
import java.awt.Graphics;
import java.util.Date;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
/* <applet code = MyApplet.class width="500" height="500">Java Applet for screen capture</applet> */
public class MyApplet extends Applet {
/* Applet Life cycle Methods */
public void start()
{
try{
// capture the whole screen
BufferedImage screencapture = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()) );
// Save as JPEG
File file = new File("D:/screencapture.jpg");
ImageIO.write(screencapture, "jpg", file);
System.out.println("screen capture finished : ");
}//try closing...
catch(Exception e)
{
System.out.println("screen capture error : ");
e.printStackTrace();
}//catch closing...
}//start closing...
public void stop()
{
}
}
我得到这个:
java.security.AccessControlException: access denied ("java.awt.AWTPermission" "createRobot")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
at java.security.AccessController.checkPermission(AccessController.java:560)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at java.awt.Robot.checkRobotAllowed(Robot.java:170)
at java.awt.Robot.init(Robot.java:134)
at java.awt.Robot.<init>(Robot.java:96)
at MyApplet.start(MyApplet.java:23)
at sun.applet.AppletPanel.run(AppletPanel.java:474)
at java.lang.Thread.run(Thread.java:722)
任何帮助,任何想法都会被应用。