applet

问题 I have problem in setup of policy file for applet.I am doing this first time and don't know how to set the policy file for applet in java.Actually I want to give the permission to the applet to write on the file system. for Which I will have to give file permission to the applet So I make a file named .java.policy and and put the following code in it grant codeBase "file:/C://res/applet/*" { permission java.io.FilePermission "C:\\res\\applet\\test.txt", "read, write"; }; and save this in

问题 I'm trying to read a envrionment varaible from a applet, here is my code String env = System.getenv("TWS"); System.out.println(env); Runtime rt = Runtime.getRuntime(); String s = env + "\\WebStart.bat " ; System.out.println(s); try { Process p = rt.exec(s); } catch (Exception e) { } when i run the code from netbeans by right click and run, it is running without a problem. but when i put it to a jar file, add it to my web application and try to run it from a html page using the following code

问题 PrintServiceLookup.lookupDefaultPrintService() returns NULL as I have a printer installed and set to default printer. If I am using this in a simple program it works fine, but when I try to use it in my applet-based program it returns NULL . Please send me some good solution for this problem. 回答1: In order to access the printer (or any resource on the host computer for that matter) the jar file in which the applet code resides has to be signed, and the user must accept the signer as a trusted

问题 Since Java 7 Update 25 , Applet's method getCodeBase() seems to return NULL for local applets. I haven't found anything in Java 7u25 release notes that would announce/explain this change, but I found an email discussion which claims the change is actually intended. Can anyone help me to find a resource/documentation where I could learn more about this change? 回答1: release notes are here: http://www.oracle.com/technetwork/java/javase/7u25-relnotes-1955741.html its in there. "Local Applets

问题 I've trying to read and write a file from an applet so if I run the applet from my appletviewer it is possible for me to read/write a file but when I try to do it from my browser I get a security exception. Any idea how to do this? 回答1: Is it possible to read/write a file from an applet Yes, but you need to sign the applet and get approval from the user. Some useful links: How can an Applet read files on the local file system (from coderanch.com) Essentials, Part 1, Lesson 6: File Access and

问题 I've put together a basic applet where the user selects a file from their hard drive, it reads the first line of this file and passes that off to JavaScript for some additional preprocessing, and then when you click a button it tries to upload that file through an HTTP POST request. I found a very basic open source applet for uploading files that I copied and modified for this last bit. The trouble is, though, it doesn't quite work. It seems like it's running fine, but then I run into two

问题 this is my code actually it's just a moving space invader game. i search the internet for the animation i have tried the double buffering, it gets rid the flickering but its ruining the entire output. it also has java uses or overrides a deprecated API. Note: Recompile with -Xlint:deprecation for details. this is so hard... import javax.sound.sampled.*; import java.applet.*; import java.awt.*; public class SpaceInvaders extends Applet implements Runnable{ AudioClip soundFile1; int Xposition

问题 I'm making a program that has 2 screens, a title and a game screen. If the user clicks "Play", they can proceed to the next screen. However, on the next screen if the user tries to press the button "Keep Going", nothing happens. I want to know why this is and if anyone can fix it. Thanks, and here is my code: import java.applet.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class ZombieDice extends Applet implements ActionListener { Panel p_card; Panel card1,

问题 I signed my applet using .pfx file. But when I run my web page it shows "UNKNOWN publisher warning". I also have another certificate .cer (How to check that its a code signing certificate)[I got it from another person and he is also not sure]. So to sign applet, do I need special certificate say "Code Signing" certificate? Or I'm missing something? 回答1: A digital certificate that is generated by me or you will read UNKNOWN in that dialog. The reason is that if you can make a certificate

问题 I signed my applet using .pfx file. But when I run my web page it shows "UNKNOWN publisher warning". I also have another certificate .cer (How to check that its a code signing certificate)[I got it from another person and he is also not sure]. So to sign applet, do I need special certificate say "Code Signing" certificate? Or I'm missing something? 回答1: A digital certificate that is generated by me or you will read UNKNOWN in that dialog. The reason is that if you can make a certificate