2012-03-28 70 views
1

多個渠道,現在有一個問題,當我嘗試在同一會話射擊第二個命令使用Jsch APIJsch - 每個會話

package examples.com; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 

import com.jcraft.jsch.Channel; 
import com.jcraft.jsch.ChannelExec; 
import com.jcraft.jsch.JSch; 
import com.jcraft.jsch.JSchException; 
import com.jcraft.jsch.Session; 

public class TempFile { 

private static Session connectSession(String userName, String password, String host) throws Exception { 
     JSch.setLogger(new MyLogger()); 
     JSch jsch = new JSch(); 
     Session session = null; 
     try { 
      session = jsch.getSession(userName, host, 22); 
      session.setPassword(password); 
      session.setTimeout(10000); 
      java.util.Properties config = new java.util.Properties(); 
      config.put("StrictHostKeyChecking", "no"); 
      session.setConfig(config); 
      session.connect();      
     } 
     catch (JSchException ex) { 
      System.out.println(ex); 
     } 
     return session; 
    } 

    private static void connectChannel(Session session, String command) throws JSchException, IOException { 
     System.out.println(command); 
     Channel channel = null; 
     channel = session.openChannel("exec"); 
     ((ChannelExec) channel).setCommand(command); 
     InputStream in = channel.getInputStream(); 
     channel.connect(); 
     System.out.println("channel.isConnected() "+channel.isConnected()); 
     setInAndOutStream(channel, in); 
     channel.disconnect(); 
     System.out.println("channel.isClosed() "+channel.isClosed()); 
    } 

    private static void setInAndOutStream(Channel channel, InputStream in) throws IOException, JSchException { 
     BufferedReader br = new BufferedReader(new InputStreamReader(in)); 
     StringBuilder outPutResult = new StringBuilder(""); 
     int exitStatus = -100; 
     String output; 
     while (true) { 
      while (true) { 
       try { 
        String result = br.readLine(); 
        if (result == null) 
         break; 
        outPutResult.append(result); 
       } catch (Exception ex) { 
        ex.printStackTrace(); 
        break; 
       } 
      } 
      output = outPutResult.toString(); 

      if (channel.isClosed()) { 
       exitStatus = channel.getExitStatus(); 
       break; 
      } 
     } 
     System.out.println(exitStatus); 
     System.out.println(output); 
    } 

    private static void executeCommand(Session session, String command) throws JSchException, IOException{ 
     connectChannel(session,command); 
    } 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     System.out.println("starting"); 
     // TODO Auto-generated method stub 
     try { 
      Session session = connectSession("username", "password", "host"); 
      if(session!=null) { 
       executeCommand(session, "ls"); 
       executeCommand(session, "cp out.txt copy.txt"); 

       session.disconnect(); 
      } 
     } catch (JSchException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     System.out.println("done.."); 
    } 

} 

如果我使用Linux機器作爲主機它工作正常。 但是,如果我嘗試連接到具有openssh的Windows Server 2008計算機,它將無法執行第二個命令,即「executeCommand(session,」cp out.txt copy.txt「);」它返回狀態255.

什麼必須出錯?我們是否需要在ssh配置文件中設置一些選項來支持這一個會話和多個通道?

+1

這可能是因爲服務器的SSHD實現只是不支持多通道。這看起來更像是一個服務器問題,而不是客戶端(即JSch)。 – 2012-04-15 14:32:53

+0

首先感謝回覆..是的,我明白它一定是服務器問題。但我如何讓服務器支持這一個會話的多個通道。我已經嘗試在服務器端的sshd_config文件上設置MaxSessions選項,因爲我已經讀過它映射到JSch API上的通道數量的地方。但是在上述情況下,這並沒有幫助。 – bhagyashree 2012-04-17 05:02:59

回答

0

嘗試改變

 channel = session.openChannel("exec"); 

channel = session.openChannel("shell");