Question

我使用JSch将本地计算机连接到具有mongoDB的服务器。使用JSch成功连接到服务器后，我无法访问MongoDB数据库。这是代码-

System.out.println("Start...");

    // forwarding ports
    String LOCAL_HOST = "127.0.0.1";
    String REMOTE_HOST = "xx.xx.xx.xx";
    Integer LOCAL_PORT = 8988;
    Integer REMOTE_PORT = 27017; // Default mongodb port

    // ssh connection info
    String SSH_USER = "xx";
    String SSH_PASSWORD = "";
    String SSH_HOST = "xx.xx.xx.xx";
    Integer SSH_PORT = 22;

    Session SSH_SESSION = null;

    try {
        java.util.Properties config = new java.util.Properties();
        config.put("StrictHostKeyChecking", "no");
        JSch jsch = new JSch();


        JFileChooser chooser = new JFileChooser();
          chooser.setDialogTitle("Choose your privatekey(ex. ~/.ssh/id_dsa)");
          chooser.setFileHidingEnabled(false);
          int returnVal = chooser.showOpenDialog(null);
          if(returnVal == JFileChooser.APPROVE_OPTION) {
            System.out.println("You chose "+
                   chooser.getSelectedFile().getAbsolutePath()+".");
            jsch.addIdentity(chooser.getSelectedFile().getAbsolutePath()
             , "passphrase"
                 );
          }

        SSH_SESSION = null;
        SSH_SESSION = jsch.getSession(SSH_USER, SSH_HOST, SSH_PORT);
        SSH_SESSION.setConfig(config);
        SSH_SESSION.connect();
        System.out.println("Connection established...");
        SSH_SESSION.setPortForwardingL(LOCAL_PORT, REMOTE_HOST, REMOTE_PORT);
        System.out.println("Port forwarding done...");

        MongoClient mongoClient = new MongoClient(LOCAL_HOST, LOCAL_PORT);
        mongoClient.setReadPreference(ReadPreference.nearest());
        System.out.println("Mongo client created...");
        MongoCursor<String> dbNames = mongoClient.listDatabaseNames().iterator();
        System.out.println("Mongo cursor fetched...");
        while (dbNames.hasNext()) {
            System.out.println(dbNames.next());
        }
        System.out.println("End...");

    } catch (Exception e) {
        e.printStackTrace();
    } finally {

        try {
            SSH_SESSION.delPortForwardingL(LOCAL_PORT);
        } catch (JSchException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        SSH_SESSION.disconnect();
    }

输出以及异常：

Start...
You chose C:\XXXXXXX\dsworker_rsa.
Connection established...
Port forwarding done...
Aug 06, 2018 12:37:55 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Cluster created with settings {hosts=[127.0.0.1:8988], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500}
Mongo client created...
Aug 06, 2018 12:37:55 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: No server chosen by ReadPreferenceServerSelector{readPreference=primary} from cluster description ClusterDescription{type=UNKNOWN, connectionMode=SINGLE, all=[ServerDescription{address=127.0.0.1:8988, type=UNKNOWN, state=CONNECTING}]}. Waiting for 30000 ms before timing out
Aug 06, 2018 12:38:15 PM com.mongodb.diagnostics.logging.JULLogger log
INFO: Exception in monitor thread while connecting to server 127.0.0.1:8988
com.mongodb.MongoSocketReadTimeoutException: Timeout while receiving message
    at com.mongodb.connection.InternalStreamConnection.translateReadException(InternalStreamConnection.java:474)
    at com.mongodb.connection.InternalStreamConnection.receiveMessage(InternalStreamConnection.java:225)
    at com.mongodb.connection.CommandHelper.receiveReply(CommandHelper.java:134)
    at com.mongodb.connection.CommandHelper.receiveCommandResult(CommandHelper.java:121)
    at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:32)
    at com.mongodb.connection.InternalStreamConnectionInitializer.initializeConnectionDescription(InternalStreamConnectionInitializer.java:83)
    at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:43)
    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:115)
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:127)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.socketRead(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at com.mongodb.connection.SocketStream.read(SocketStream.java:85)
    at com.mongodb.connection.InternalStreamConnection.receiveResponseBuffers(InternalStreamConnection.java:491)
    at com.mongodb.connection.InternalStreamConnection.receiveMessage(InternalStreamConnection.java:221)
    ... 8 more

代码中是否缺少任何内容？

无法使用Java中的JSch和MongoClient连接到Mongo

0 个答案: