Question

我在尝试使用log4j编写日志时遇到异常。

以下是抛出的异常：

java.security.AccessControlException: access denied ("java.io.FilePermission" "D:\appletServer\bqapplet.log" "write")
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at sun.plugin2.applet.AWTAppletSecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkWrite(Unknown Source)
     at java.io.FileOutputStream.<init>(Unknown Source)
     at java.io.FileOutputStream.<init>(Unknown Source)
     at org.apache.log4j.FileAppender.setFile(FileAppender.java:294)
     at org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:207)
     at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:165)
     at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307)
     at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172)
     at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104)
     at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842)
     at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768)
     at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648)
     at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514)
     at org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:440)
     at com.bqurious.applet.CommandExecutor.<init>(CommandExecutor.java:41)
     at com.bqurious.applet.BqAppletMainAppender.waitForConnections(BqAppletMainAppender.java:604)
     at com.bqurious.applet.BqAppletMainAppender.run(BqAppletMainAppender.java:195)
     at java.lang.Thread.run(Unknown Source)
  Error! - java.security.AccessControlException: access denied ("java.io.FilePermission" "D:\appletServer\bqapplet.log" "write")

Answer 1

Applet将默认在沙盒环境中运行。为了允许它访问本地文件，您必须对其进行签名。根据您的使用情况，不同的方法可能是登录标准输出（将在java控制台上提供）。

Oracle提供了一个教程，您可以在其中阅读有关What Applets Can and Cannot Do的更多信息。

如何为applet应用程序编写日志文件？

1 个答案: