[RESOLVED] Command line arguments in Eclipse
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Thread: [RESOLVED] Command line arguments in Eclipse

  1. #1
    Join Date
    Aug 2011
    Posts
    22

    [RESOLVED] Command line arguments in Eclipse

    Hi,

    I am trying a small piece of code to retrieve a file from remote system to the local system. This requires me to write the user, hostname and file names in the command prompt. Where do I give the inputs in Eclipse? Here is the code.

    Code:
    import com.jcraft.jsch.*;
    import java.awt.*;
    import javax.swing.*;
    import java.io.*;
    
    public class ScpFrom{
      public static void main(String[] arg){
        if(arg.length!=2){
          System.err.println("usage: java ScpFrom user@remotehost:file1 file2");
          System.exit(-1);
        }      
    
        FileOutputStream fos=null;
        try{
    
          String user=arg[0].substring(0, arg[0].indexOf('@'));
          arg[0]=arg[0].substring(arg[0].indexOf('@')+1);
          String host=arg[0].substring(0, arg[0].indexOf(':'));
          String rfile=arg[0].substring(arg[0].indexOf(':')+1);
          String lfile=arg[1];
    
          String prefix=null;
          if(new File(lfile).isDirectory()){
            prefix=lfile+File.separator;
          }
    
          JSch jsch=new JSch();
          Session session=jsch.getSession(user, host, 22);
    
          // username and password will be given via UserInfo interface.
          UserInfo ui=new MyUserInfo();
          session.setUserInfo(ui);
          session.connect();
    
          // exec 'scp -f rfile' remotely
          String command="scp -f "+rfile;
          Channel channel=session.openChannel("exec");
          ((ChannelExec)channel).setCommand(command);
    
          // get I/O streams for remote scp
          OutputStream out=channel.getOutputStream();
          InputStream in=channel.getInputStream();
    
          channel.connect();
    
          byte[] buf=new byte[1024];
    
          // send '\0'
          buf[0]=0; out.write(buf, 0, 1); out.flush();
    
          while(true){
    	int c=checkAck(in);
            if(c!='C'){
    	  break;
    	}
    
            // read '0644 '
            in.read(buf, 0, 5);
    
            long filesize=0L;
            while(true){
              if(in.read(buf, 0, 1)<0){
                // error
                break; 
              }
              if(buf[0]==' ')break;
              filesize=filesize*10L+(long)(buf[0]-'0');
            }
    
            String file=null;
            for(int i=0;;i++){
              in.read(buf, i, 1);
              if(buf[i]==(byte)0x0a){
                file=new String(buf, 0, i);
                break;
      	  }
            }
    
    	//System.out.println("filesize="+filesize+", file="+file);
    
            // send '\0'
            buf[0]=0; out.write(buf, 0, 1); out.flush();
    
            // read a content of lfile
            fos=new FileOutputStream(prefix==null ? lfile : prefix+file);
            int foo;
            while(true){
              if(buf.length<filesize) foo=buf.length;
    	  else foo=(int)filesize;
              foo=in.read(buf, 0, foo);
              if(foo<0){
                // error 
                break;
              }
              fos.write(buf, 0, foo);
              filesize-=foo;
              if(filesize==0L) break;
            }
            fos.close();
            fos=null;
    
    	if(checkAck(in)!=0){
    	  System.exit(0);
    	}
    
            // send '\0'
            buf[0]=0; out.write(buf, 0, 1); out.flush();
          }
    
          session.disconnect();
    
          System.exit(0);
        }
        catch(Exception e){
          System.out.println(e);
          try{if(fos!=null)fos.close();}catch(Exception ee){}
        }
      }
    
      static int checkAck(InputStream in) throws IOException{
        int b=in.read();
        // b may be 0 for success,
        //          1 for error,
        //          2 for fatal error,
        //          -1
        if(b==0) return b;
        if(b==-1) return b;
    
        if(b==1 || b==2){
          StringBuffer sb=new StringBuffer();
          int c;
          do {
    	c=in.read();
    	sb.append((char)c);
          }
          while(c!='\n');
          if(b==1){ // error
    	System.out.print(sb.toString());
          }
          if(b==2){ // fatal error
    	System.out.print(sb.toString());
          }
        }
        return b;
      }
    
      public static class MyUserInfo implements UserInfo, UIKeyboardInteractive{
        public String getPassword(){ return passwd; }
        public boolean promptYesNo(String str){
          Object[] options={ "yes", "no" };
          int foo=JOptionPane.showOptionDialog(null, 
                 str,
                 "Warning", 
                 JOptionPane.DEFAULT_OPTION, 
                 JOptionPane.WARNING_MESSAGE,
                 null, options, options[0]);
           return foo==0;
        }
      
        String passwd;
        JTextField passwordField=(JTextField)new JPasswordField(20);
    
        public String getPassphrase(){ return null; }
        public boolean promptPassphrase(String message){ return true; }
        public boolean promptPassword(String message){
          Object[] ob={passwordField}; 
          int result=
    	  JOptionPane.showConfirmDialog(null, ob, message,
    					JOptionPane.OK_CANCEL_OPTION);
          if(result==JOptionPane.OK_OPTION){
    	passwd=passwordField.getText();
    	return true;
          }
          else{ return false; }
        }
        public void showMessage(String message){
          JOptionPane.showMessageDialog(null, message);
        }
        final GridBagConstraints gbc = 
          new GridBagConstraints(0,0,1,1,1,1,
                                 GridBagConstraints.NORTHWEST,
                                 GridBagConstraints.NONE,
                                 new Insets(0,0,0,0),0,0);
        private Container panel;
        public String[] promptKeyboardInteractive(String destination,
                                                  String name,
                                                  String instruction,
                                                  String[] prompt,
                                                  boolean[] echo){
          panel = new JPanel();
          panel.setLayout(new GridBagLayout());
    
          gbc.weightx = 1.0;
          gbc.gridwidth = GridBagConstraints.REMAINDER;
          gbc.gridx = 0;
          panel.add(new JLabel(instruction), gbc);
          gbc.gridy++;
    
          gbc.gridwidth = GridBagConstraints.RELATIVE;
    
          JTextField[] texts=new JTextField[prompt.length];
          for(int i=0; i<prompt.length; i++){
            gbc.fill = GridBagConstraints.NONE;
            gbc.gridx = 0;
            gbc.weightx = 1;
            panel.add(new JLabel(prompt[i]),gbc);
    
            gbc.gridx = 1;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            gbc.weighty = 1;
            if(echo[i]){
              texts[i]=new JTextField(20);
            }
            else{
              texts[i]=new JPasswordField(20);
            }
            panel.add(texts[i], gbc);
            gbc.gridy++;
          }
    
          if(JOptionPane.showConfirmDialog(null, panel, 
                                           destination+": "+name,
                                           JOptionPane.OK_CANCEL_OPTION,
                                           JOptionPane.QUESTION_MESSAGE)
             ==JOptionPane.OK_OPTION){
            String[] response=new String[prompt.length];
            for(int i=0; i<prompt.length; i++){
              response[i]=texts[i].getText();
            }
    	return response;
          }
          else{
            return null;  // cancel
          }
        }
      }
    }
    Last edited by shik28; September 12th, 2011 at 04:38 AM. Reason: punctuation missing

  2. #2
    Join Date
    May 2009
    Posts
    2,413

    Re: Command line arguments in Eclipse

    Strictly that's not a Java question but here's an answer I found with a quick internet search,

    http://www.javaprogrammingforums.com...s-eclipse.html

  3. #3
    Join Date
    Aug 2011
    Posts
    22

    Re: Command line arguments in Eclipse

    @nuzzle: I tried these steps. But I'm not getting the output.

    This is example program from www.jcraft.com. Link to the program: http://www.jcraft.com/jsch/examples/ScpFrom.java. I need to know what input has to be given to run this code.

  4. #4
    Join Date
    Aug 2011
    Posts
    22

    Re: Command line arguments in Eclipse

    The source file is located in a $LOGDATA/temp in the remote system. File name is MovePurge.krishna.090611 But the output says

    scp: /temp/MovePurge.krishna.090611: No such file or directory.

    If the source file is in the root directory, the code works fine.

  5. #5
    Join Date
    Aug 2011
    Posts
    22

    Re: Command line arguments in Eclipse

    @nuzzle: Thanks

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