在使用java.awt.Robot中类为小应用程序屏幕捕获java.security.AccessControlException [英] java.security.AccessControlException when using java.awt.Robot class for screen capture in applet
问题描述
我需要捕捉到了网页画面,将其存储客户端的计算机上,只要客户端点击打印按钮,屏幕上。为此,我用Google搜索,并得到了由我的jsp页面中嵌入有签名(可信的小程序)的小程序,我可以做到这一点。所以我用一个简单的小程序的独立Java类的尝试。如果成功,我可以在签署后的小程序尝试对JSP。
我试过是:
I require to capture a web page screen to store it on client's machine whenever client clicks print screen button. For this I googled and got that by embedding an applet with signature(trusted applet) in my jsp page i can do this. So I am trying with a simple applet for an standalone java class. On success I can try it for jsp after signing the applet. What I tried is:
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()
{
}
}
我得到这样的:
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,任何想法将appriciated。
Any help, Any idea will be appriciated.
推荐答案
我解决了这个问题。
我所做的一切只是在粘贴java.policy文件这些行(只搜索这个文件在你的Java安装文件夹,你会在3个地方得到它,需要的所有文件复制粘贴此最后)
I solved this problem. All I did is just pasted these lines in java.policy file(just search this file in your java installation folder and you will get it at 3 places and need to paste this at last in all files)
permission java.awt.AWTPermission "createRobot";
permission java.awt.AWTPermission "accessClipboard";
permission java.awt.AWTPermission "accessEventQueue";
permission java.awt.AWTPermission "showWindowWithoutWarningBanner";
permission java.awt.AWTPermission "readDisplayPixels", "read";
permission java.io.FilePermission "<<ALL FILES>>", "read, write, delete, execute";
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