Question

我的applet遇到了问题。它应该采用一个url并解析html来构建一个图像。我已经让它在我的eclipse调试器上工作了。但是，当我尝试在Web浏览器上使用它时，我得到一个AccessControlException。我正在使用jEditorPane.setPage（url）方法。目前，applet和url都托管在我的localhost上，并且我对applet进行了自签名。

java.lang.RuntimeException: java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:80 connect,resolve)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
    at java.net.HttpURLConnection.getResponseCode(Unknown Source)
    at javax.swing.JEditorPane.getStream(Unknown Source)
    at javax.swing.JEditorPane.setPage(Unknown Source)
    at javax.swing.JEditorPane.setPage(Unknown Source)
    at com.mindbody.printer.PrinterApplet.print(PrinterApplet.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.JSInvoke.invoke(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Answer 1

仅允许未签名的小程序连接到它来自的主机。甚至对于已签名的applet，在从不受信任的代码调用的方法（如此处的javascript代码）中，它只拥有此代码的权限（或更确切地说，是所有权限的交集）。

为了能够执行您的applet拥有权限的所有内容，请使用AccessController.doPrivileged(...)包装您的需要权限的代码。（但是当从外部给出恶意论据时，请确保这不会造成危险的事情。）

Applet中的Java安全性AccessControlException

1 个答案: