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[英]I have run the following program in netbeans, the build was successful but when I run the java file I get the following exception:
[英]I have this code but when I run it I get an exception
我有以下代碼,但是在運行它時出現異常:
java.security.AccessControlException:訪問被拒絕(java.net.SocketPermission 127.0.0.1:8081 connect,resolve)
這是代碼,服務器運行良好,但是客戶端無法正常工作。
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
width="615" height="360"
codebase="http://java.sun.com/products/plugin/autodl/jinstall-1_4-windows-i586.cab#Version=1,4,0,mn">
<PARAM name="code" value="client/LlamaChat.class">
<PARAM name="archive" value="LlamaChat.jar">
<PARAM name="type" value="application/x-java-applet;version=1.4">
<PARAM name="scriptable" value="true">
<PARAM name="username" value="[replace with username]">
<PARAM name="port" value="[replace with port]">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.4"
width="615" height="360"
code="client/LlamaChat.class" archive="LlamaChat.jar"
pluginspage="http://java.sun.com/j2se/1.4.1/download.html"
username="nis"
port="8081"
<NOEMBED>
No Java 1.4 plugin
</NOEMBED></EMBED>
</COMMENT>
</OBJECT>
這是所有錯誤消息:
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:8081 connect,resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkConnect(Unknown Source)
at sun.plugin2.applet.Applet2SecurityManager.checkConnect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(Unknown Source)
at client.ServerConnection.<init>(Unknown Source)
at client.LlamaChat.connect(Unknown Source)
at client.LlamaChat.init(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
有什么問題,我該如何解決?
我使用的端口是8081。
小程序有某些事情可以做,不能做。 簽名的applet可以執行您授予它們的權限的所有操作,或者您必須顯式授予applet(或更具體地說是主機)的權限才能執行某些操作。 打開端口(這是我假設您要在applet代碼中嘗試做的事情),是applet需要獲得權限才能執行的操作之一。
最好的辦法是在小程序所在的罐子上簽名,然后瀏覽器會提示您要允許的內容。
您是否正在運行匹配的服務器?
如果您使用的是這樣的示例,請檢查您是否正確輸入了用戶名,端口,站點和位置-在鏈接和代碼中,用戶名設置了兩次,而站點沒有設置。 端口設置為[replace with port]
不正確,主機名首先設置為[replace with username]
,也不正確。
我懷疑第二次設置用戶名是應該設置服務器名的位置,但是我對此小程序一無所知。 嘗試使用此代碼,但首先替換[square brackets]
中的所有4個值:
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
width="615" height="360"
codebase="http://java.sun.com/products/plugin/autodl/jinstall-1_4-windows-i586.cab#Version=1,4,0,mn">
<PARAM name="code" value="client/LlamaChat.class">
<PARAM name="archive" value="LlamaChat.jar">
<PARAM name="type" value="application/x-java-applet;version=1.4">
<PARAM name="scriptable" value="true">
<PARAM name="username" value="[replace with username]">
<PARAM name="port" value="[replace with port]">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.4"
width="615" height="360"
code="client/LlamaChat.class" archive="LlamaChat.jar"
pluginspage="http://java.sun.com/j2se/1.4.1/download.html"
site="[replace with site]"
port="[replace with port]"
<NOEMBED>
No Java 1.4 plugin
</NOEMBED></EMBED>
</COMMENT>
</OBJECT>
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