我在netbeans中有两个项目。一个是我的网络和我的servlet。第二个项目名为Applet，包含我需要工作的applet（自签名applet）。 applet通过打包选项添加到Web项目中，在浏览器中运行良好。我有一个方法打开URL连接到servlet并发送GET请求，servlet发送响应，我在我的aplet中获取inputStream到jLabel文本。所有工作都在浏览器中工作，但是当我在Appletviewer中尝试它时，它会触发异常，并且在HTTP服务器中监视器不会向UrlConnection.getInputstream（）完成时出现对服务器的新GET请求。这就是我的问题？那么存在从Appletviewer连接到servlet的任何解决方案吗？
这是我从servlet获取文本的方法，该文本在浏览器中使用我的Web运行，但如果我通过appletviewer运行它则不行
URL url = null;
try {
url = new URL("http://localhost:8084/Rozhlas_jsf/SoundServlet?name=startSounds");
} catch (MalformedURLException ex) {
Logger.getLogger(SoundApplet.class.getName()).log(Level.SEVERE, null, ex);
}
// open a connection to the servlet
URLConnection servletConnection=null;
try {
servletConnection = url.openConnection();
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
} catch (IOException ex) {
Logger.getLogger(SoundApplet.class.getName()).log(Level.SEVERE, null, ex);
}
try {
// get the input stream from the servlet
InputStream in = servletConnection.getInputStream();
jLabel1.setText(convertStreamToString(in)) ;
} catch (IOException ex) {
Logger.getLogger(SoundApplet.class.getName()).log(Level.SEVERE, null, ex);
}
以下是我在applet viewer中尝试时发生的事情
compile-single:
run-applet:
Exception in thread "AWT-EventQueue-1" java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost:8084" "connect,resolve")
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.checkConnect(SecurityManager.java:1051)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:466)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:300)
at sun.net.www.http.HttpClient.New(HttpClient.java:316)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:992)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:928)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:846)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1296)
at SoundApplet.SoundApplet.jButton5ActionPerformed(SoundApplet.java:683)
at SoundApplet.SoundApplet.access$200(SoundApplet.java:44)
at SoundApplet.SoundApplet$3.actionPerformed(SoundApplet.java:184)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
问题已解决!!!
我今天早上尝试更改applet.policy文件，因为我试图解决这个问题 my another problem
我覆盖了这个
grant {
permission java.security.AllPermission;
};
由此
grant {
permission java.io.FilePermission "<<ALL FILES>>","write";
};
通过它我失去了从appletviewer连接我的Servlet的权限。我只是重写了一下，一切都很好。对不必要的主题感到抱歉，但我真的很生气。