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該小程序將從SFTP服務器下載文件。 JSch庫用於創建會話,使用它連接到SFTP服務器,創建SFTP通道並對該服務器上的該文件執行GET命令。小程序已簽名。使用應用程序中的JSch連接到SFTP服務器時發生AccessControlException
用於下載文件的代碼片段:
public static void prepareSession() throws JSchException {
try {
session = jsch.getSession(user,host,port);
session.setConfig("StrictHostKeyChecking", "no");
session.setPassword(password);
} catch (JSchException e) {
e.printStackTrace();
throw new JSchException(e.getLocalizedMessage(),e);
}
}
public synchronized static void downloadFile() throws Exception {
ChannelSftp channelSFTP = null;
try {
if (!session.isConnected()) {
session.connect();
}
Channel channel=session.openChannel("sftp");
channel.connect();
channelSFTP=(ChannelSftp)channel;
String destFile = SFTPImpl.destFolder + "/" + SFTPImpl.sourceFile + ".part";
log.info("Downloading file: " + SFTPImpl.sourceFile + " -- START");
channelSFTP.get(SFTPImpl.sourceFile,destFile,SFTPImpl.monitor,ChannelSftp.OVERWRITE);
} catch (JSchException e) {
log.error("Error occurred within library", e);
throw new JSchException(e.getMessage(),e);
} catch (SftpException e) {
log.error("Error occurred in SFTP communication. Error ID: " + e.id, e);
throw new SftpException(e.id,e.getMessage(),e);
} catch (Exception e) {
throw new Exception(e.getMessage(),e);
}finally {
if (channelSFTP != null && channelSFTP.isConnected()) {
channelSFTP.quit();
channelSFTP.disconnect();
session.disconnect();
}
}
}
applet是使用Java部署工具包部署。對於小應用程序部署HTML頁面的代碼片段是:
<script src="http://www.java.com/js/deployJava.js"></script>
<script>
var attributes = {code:'com.sftptest.applet.SFTPApplet', archive:'signedsftp.jar,jsch.jar,log4j-1.2.15.jar', width:400, height:400} ;
var parameters = {jnlp_href: 'sftpdownload-applet.jnlp'} ;
deployJava.runApplet(attributes, parameters, '1.6');
</script>
sftpdownload-applet.jnlp文件:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="" href="">
<information>
<title>SFTP Downloader</title>
<vendor>local</vendor>
</information>
<resources>
<!-- Application Resources -->
<j2se version="1.6+"
href="http://java.sun.com/products/autodl/j2se" />
<jar href="signedsftpsftp.jar" main="true" />
<jar href="jsch.jar" />
<jar href="log4j-1.2.15.jar" />
</resources>
<applet-desc
name="SFTP Downloader Applet"
main-class="com.sftptest.applet.SFTPApplet"
width="400"
height="400">
</applet-desc>
<update check="background"/>
</jnlp>
小程序包含用來選擇下載位置的文件選擇器。只要選擇了下載位置,小程序就應該開始下載文件。但一段時間後,下面的錯誤在控制檯來:
[Oct 12 20:39:16] ERROR (SFTPImpl.java:130) - Error occurred within library
com.jcraft.jsch.JSchException: java.security.AccessControlException: access denied (java.net.SocketPermission sftpcal.cognizant.com resolve)
at com.jcraft.jsch.Util.createSocket(Util.java:341)
at com.jcraft.jsch.Session.connect(Session.java:182)
at com.jcraft.jsch.Session.connect(Session.java:150)
at com.sftptest.SFTPImpl.downloadFile(SFTPImpl.java:111)
at com.sftptest.ui.DownloadPanel$DownloadTask.doInBackground(DownloadPanel.java:316)
at com.sftptest.ui.DownloadPanel$DownloadTask.doInBackground(DownloadPanel.java:1)
at javax.swing.SwingWorker$1.call(SwingWorker.java:278)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at javax.swing.SwingWorker.run(SwingWorker.java:317)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:637)
從異常日誌我看到異常從JSch框架的Util.createSocket()
方法來:
static Socket createSocket(String host, int port, int timeout) throws JSchException{
Socket socket=null;
if(timeout==0){
try{
socket=new Socket(host, port);
return socket;
}
catch(Exception e){
String message=e.toString();
if(e instanceof Throwable)
throw new JSchException(message, (Throwable)e);
throw new JSchException(message);
}
}
請幫&讓我知道如果需要更多信息。
恐怕我得到了同樣的錯誤。我按照你所說的改變了jnlp文件並且開啓了applet。我還需要做其他事嗎? – kaychaks 2009-10-12 16:48:28
嗯。如果包含' '而不是' ',會發生什麼?如果**那個**不起作用,那麼你沒有正確部署。 –
2009-10-12 17:50:07
我也懷疑你是否也必須簽署jsch.jar ... – 2009-10-12 17:51:07