控制台不让我的小程序因为文件而运行 [英] Console don't let my applet run because of a file

问题描述

我在一个小程序中工作.它与 Eclipse 完美配合，但是当我尝试从控制台运行时，它给了我这个堆栈跟踪:

C:\Course Technology\src>appletviewer TestJalienHunt.html输入的文件路径 D:\Course Technology\AssignmentFinal\scoreFile.txt java.security.AccessControlException: access denied ("java.io.FilePermission" "D:\Course Technology\AssignmentFinal\scoreFile.txt" "read")在 java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)在 java.security.AccessController.checkPermission(AccessController.java:555)在 java.lang.SecurityManager.checkPermission(SecurityManager.java:549)在 java.lang.SecurityManager.checkRead(SecurityManager.java:888)在 sun.nio.fs.WindowsPath.checkRead(WindowsPath.java:792)在 sun.nio.fs.WindowsFileSystemProvider.checkAccess(WindowsFileSystemProvider.java:360)在 java.nio.file.Files.exists(Files.java:2311)在 ReadFile.fileExists(ReadFile.java:47)在 JAlienHunt.readScore(JalienHunt.java:187)在 JAlienHunt.init(JAlienHunt.java:73)在 sun.applet.AppletPanel.run(AppletPanel.java:434)在 java.lang.Thread.run(Thread.java:722)

文件有读写权限，为什么我得到这个?

解决方案

小程序需要经过您的数字签名并得到最终用户的信任，然后才能访问用户计算机上的本地文件系统.

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我突出显示用户的计算机，因为这是任何File 等同的地方.没有让 File 指向服务器的选项.如果这是只读的并且服务器托管资源，请通过 URL 访问它.

I am working in an applet. It works perfect with Eclipse but when I try to run from Console it gives me this stack trace:

C:\Course Technology\src>appletviewer TestJAlienHunt.html

Path for file entered D:\Course Technology\AssignmentFinal\scoreFile.txt java.security.AccessControlException: access denied ("java.io.FilePermission" "D:\Course Technology\AssignmentFinal\scoreFile.txt" "read")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
    at java.security.AccessController.checkPermission(AccessController.java:555)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at java.lang.SecurityManager.checkRead(SecurityManager.java:888)
    at sun.nio.fs.WindowsPath.checkRead(WindowsPath.java:792)
    at sun.nio.fs.WindowsFileSystemProvider.checkAccess(WindowsFileSystemProvider.java:360)
    at java.nio.file.Files.exists(Files.java:2311)
    at ReadFile.fileExists(ReadFile.java:47)
    at JAlienHunt.readScore(JAlienHunt.java:187)
    at JAlienHunt.init(JAlienHunt.java:73)
    at sun.applet.AppletPanel.run(AppletPanel.java:434)
    at java.lang.Thread.run(Thread.java:722)

The file has permission to read and write, why I am getting this?

解决方案

An applet needs to be digitally signed by you and trusted by the end user before it can access the local file system on the user's computer.

I highlight user's computer because that is where any File will equate to. There is no option for getting a File pointing to the server. If this is read only and the server hosts the resource, access it by URL.

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