JTextArea中的BufferedReader输出

Question

I am trying to call a line from BufferedReader its in another class I want to be able to output the result in my JTextArea which is in my main class

Here is my Main Class:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import java.io.*;
import java.lang.Process.*;

public class FTP {
    public static void main (String []args){
            Runnable runner = new Runnable(){
                public void run()
                {

                    LookAndFeel nimbusLook = new LookAndFeel();
                    nimbusLook.NimbusLookAndFeel();

                    JFrame frame = new JFrame("BNA FTP Diagnose");
                    frame.setVisible(true);
                    frame.setResizable(false);
                    frame.setSize(540, 420);
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setLocation(150, 150);


                    JMenuBar menuBar = new JMenuBar();
                    frame.setJMenuBar(menuBar);

                    JMenu fileMenu = new JMenu("File");
                    menuBar.add(fileMenu);
                    final JMenuItem exitMenuItem = new JMenuItem("Exit");
                    fileMenu.add(exitMenuItem);


                    JMenu helpMenu = new JMenu("Help");
                    menuBar.add(new JPanel());
                    menuBar.add(helpMenu);
                    final JMenuItem aboutMenuItem = new JMenuItem("About");
                    helpMenu.add(aboutMenuItem);



                    JPanel titlePanel = new JPanel(new BorderLayout());
                    frame.add(titlePanel, BorderLayout.NORTH);

                    JLabel titleLabel = new JLabel("FTP Diagnose", JLabel.CENTER);
                    titleLabel.setFont(new Font(null, Font.BOLD, 14));
                    titleLabel.setForeground(Color.BLUE);
                    titlePanel.add(titleLabel);

                    JPanel gridPanel = new JPanel(new GridLayout(1, 1));
                    frame.add(gridPanel);

                    JPanel vendorPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
                    gridPanel.add(vendorPanel);

                    final String vendor [] = {"LLesiant" ,"WK-CCH", "Proquest", "Notes", "Research Institute of America", "Thomson", 
                            "BNAI PDF Processing", " TM Portfolios to Indexing", "Postscript to PRODLOGIN1", "www.firstdoor.net", "psp.bna.com", "WEST", "LexisNexis", "McArdle Printing Company", 
                            "Breaking News Email", "Ex Libris", "Pandora", "Bloomberg Law", "Acquire Media Site 1", "Acquire Media Site 2", "Quicksite", "QA Quicksite"};
                    final JComboBox vendorList = new JComboBox(vendor);
                    vendorPanel.add(vendorList);

                    JPanel diagnoseButtonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
                    gridPanel.add(diagnoseButtonPanel);
                    final JButton diagnoseButton = new JButton("Diagnose");
                    diagnoseButtonPanel.add(diagnoseButton);


                    JPanel centerPanel = new JPanel(new BorderLayout());
                    frame.add(centerPanel, BorderLayout.SOUTH);
                    JPanel commandPanel = new JPanel(new GridLayout(1, 0));
                    centerPanel.add(commandPanel);


                    final JTextArea commandResultArea = new JTextArea(7, 0);
                    JScrollPane scroll = new JScrollPane(commandResultArea, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
                    commandPanel.add(scroll);
                    commandResultArea.setEditable(false);




                    ActionListener buttonListener = new ActionListener(){

                        public void actionPerformed(ActionEvent ae)

                        {
                            int selectedIndex = vendorList.getSelectedIndex();

                            String llesiant = "ftp.llesiant.com";
                            String wkCCH = "FTP1.cch.com";
                            String proquest = "ftp.proquest.com";
                            String notes = "notes5.bna.com";


                            //String lineThree = null;

                            CommandClass readCommand = new CommandClass();

                            if (selectedIndex == 0)
                            {
                                readCommand.getCommand(llesiant);
                            }
                            else if (selectedIndex == 1)
                            {
                                readCommand.getCommand(wkCCH);
                            }
                            else if (selectedIndex == 2)
                            {
                                readCommand.getCommand(proquest);
                            }
                            else if (selectedIndex == 3)
                            {
                                readCommand.getCommand(notes);
                            }

                        }

                    };
                    diagnoseButton.addActionListener(buttonListener);

                    ActionListener exitListener = new ActionListener (){

                        public void actionPerformed(ActionEvent el)
                        {

                            if (el.getSource()== exitMenuItem)
                            {
                                JOptionPane.showMessageDialog(null, "FTP Program will exit now!");
                                System.exit(0);
                            }

                        }

                    };

                    exitMenuItem.addActionListener(exitListener);

                    ActionListener aboutListener = new ActionListener()
                    {
                        public void actionPerformed(ActionEvent al)
                        {

                            if (al.getSource()== aboutMenuItem)

                            {
                            JOptionPane.showMessageDialog(null, "This Software was made for Editors to. \nDiagnose BNA Bloomberg client FTP site.");

                            }
                        }

                    };
                    aboutMenuItem.addActionListener(aboutListener);             
                    }

            };
            EventQueue.invokeLater(runner);

        }

}

Here is my CommandClass:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.JOptionPane;


public class CommandClass {




    public String line;



    public void getCommand(String ftpSite)

    {


        String command = "ping ";


        try
        {
        Process p = Runtime.getRuntime().exec(command +ftpSite);

        BufferedReader readOutput = new BufferedReader(new InputStreamReader (p.getInputStream()));


        JOptionPane.showMessageDialog(null, "FTP is connected");

        while ((line = readOutput.readLine()) != null)
        {

                System.out.println(line);   

        }
        readOutput.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();

        }

    }





}

Here is my Look and Feel class:

import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;

public class LookAndFeel {


    public void NimbusLookAndFeel()
    {

        try {
            for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (Exception e) {
            // If Nimbus is not available, you can set the GUI to another look and feel.
        }


    }




}

What i am trying to do :Output prints out fine in the console but I wanna be able to print it out in the JTextArea in the mail class also I tried returning the value of the string line but it seems to keep coming back with null. If what i am trying to do is not possible. Is there a way to the have my JTextArea.setText to (commandCLass)

Answer 1

Improve your getCommand method like this to return proper String and use that return value in your main class to display in the JTextArea

public String getCommand(String ftpSite){
    String command = "ping ";
    StringBuffer output = new StringBuffer();
    try{
         Process p = Runtime.getRuntime().exec(command +ftpSite);
         //BufferedReader readOutput = new BufferedReader(new InputStreamReader (p.getInputStream()));
        InputStreamReader ir = new InputStreamReader (p.getInputStream());
        int outputChar = 0;
        while((outputChar = ir.read()) != -1){
            output.append((char)outputChar);
        if(!ir.ready()){ // If the next read is not guarenteed, come out of loop.
            break;
        }
            }
          ir.close();
         JOptionPane.showMessageDialog(null, "FTP is connected");
         //while ((line = readOutput.readLine()) != null){
              //System.out.println(line);   
              //output.append(line).append("\n");
         //}
         //readOutput.close();
    }catch (IOException e){
        e.printStackTrace();
    }
    return output.toString();
}

if-else block in FTP class

                CommandClass readCommand = new CommandClass();

                        if (selectedIndex == 0)
                        {
                            commandResultArea.setText(readCommand.getCommand(llesiant));
                        }
                        else if (selectedIndex == 1)
                        {
                            commandResultArea.setText(readCommand.getCommand(wkCCH));
                        }
                        else if (selectedIndex == 2)
                        {
                            commandResultArea.setText(readCommand.getCommand(proquest));
                        }
                        else if (selectedIndex == 3)
                        {
                           commandResultArea.setText(readCommand.getCommand(notes));
                        }

Answer 2

FTP Class:

I made it so that when you pinged the server, it would return a string. You can modify it to actively edit the text in the JTextField, but this works fine.

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import java.io.*;
import java.lang.Process.*;

public class FTP {



  public static void main (String []args)
  {
    Runnable runner = new Runnable(){



      public void run()
      {

        LookAndFeel nimbusLook = new LookAndFeel();
        nimbusLook.NimbusLookAndFeel();

        JFrame frame = new JFrame("BNA FTP Diagnose");
        frame.setVisible(true);
        frame.setResizable(false);
        frame.setSize(540, 420);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(150, 150);


        JMenuBar menuBar = new JMenuBar();
        frame.setJMenuBar(menuBar);

        JMenu fileMenu = new JMenu("File");
        menuBar.add(fileMenu);
        final JMenuItem exitMenuItem = new JMenuItem("Exit");
        fileMenu.add(exitMenuItem);


        JMenu helpMenu = new JMenu("Help");
        menuBar.add(new JPanel());
        menuBar.add(helpMenu);
        final JMenuItem aboutMenuItem = new JMenuItem("About");
        helpMenu.add(aboutMenuItem);



        JPanel titlePanel = new JPanel(new BorderLayout());
        frame.add(titlePanel, BorderLayout.NORTH);

        JLabel titleLabel = new JLabel("FTP Diagnose", JLabel.CENTER);
        titleLabel.setFont(new Font(null, Font.BOLD, 14));
        titleLabel.setForeground(Color.BLUE);
        titlePanel.add(titleLabel);

        JPanel gridPanel = new JPanel(new GridLayout(1, 1));
        frame.add(gridPanel);

        JPanel vendorPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
        gridPanel.add(vendorPanel);

        final String vendor [] = {"LLesiant" ,"WK-CCH", "Proquest", "Notes", "Research Institute of America", "Thomson", 
          "BNAI PDF Processing", " TM Portfolios to Indexing", "Postscript to PRODLOGIN1", "www.firstdoor.net", "psp.bna.com", "WEST", "LexisNexis", "McArdle Printing Company", 
          "Breaking News Email", "Ex Libris", "Pandora", "Bloomberg Law", "Acquire Media Site 1", "Acquire Media Site 2", "Quicksite", "QA Quicksite"};
        final JComboBox vendorList = new JComboBox(vendor);
        vendorPanel.add(vendorList);

        JPanel diagnoseButtonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        gridPanel.add(diagnoseButtonPanel);
        final JButton diagnoseButton = new JButton("Diagnose");
        diagnoseButtonPanel.add(diagnoseButton);


        JPanel centerPanel = new JPanel(new BorderLayout());
        frame.add(centerPanel, BorderLayout.SOUTH);
        JPanel commandPanel = new JPanel(new GridLayout(1, 0));
        centerPanel.add(commandPanel);


        final JTextArea commandResultArea = new JTextArea(7, 0);
        JScrollPane scroll = new JScrollPane(commandResultArea, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        commandPanel.add(scroll);
        commandResultArea.setEditable(false);




        ActionListener buttonListener = new ActionListener(){

          public void actionPerformed(ActionEvent ae)

          {
            int selectedIndex = vendorList.getSelectedIndex();

            String llesiant = "ftp.llesiant.com";
            String wkCCH = "FTP1.cch.com";
            String proquest = "ftp.proquest.com";
            String notes = "notes5.bna.com";


            //String lineThree = null;

            CommandClass readCommand = new CommandClass();

            if (selectedIndex == 0)
            {
              commandResultArea.setText(readCommand.getCommand(llesiant)); //these return strings

            }
            else if (selectedIndex == 1)
            {
              commandResultArea.setText(readCommand.getCommand(wkCCH));
            }
            else if (selectedIndex == 2)
            {
              commandResultArea.setText(readCommand.getCommand(proquest));
            }
            else if (selectedIndex == 3)
            {
              commandResultArea.setText(readCommand.getCommand(notes));
            }

          }

        };
        diagnoseButton.addActionListener(buttonListener);

        ActionListener exitListener = new ActionListener (){

          public void actionPerformed(ActionEvent el)
          {

            if (el.getSource()== exitMenuItem)
            {
              JOptionPane.showMessageDialog(null, "FTP Program will exit now!");
              System.exit(0);
            }

          }

        };

        exitMenuItem.addActionListener(exitListener);

        ActionListener aboutListener = new ActionListener()
        {
          public void actionPerformed(ActionEvent al)
          {

            if (al.getSource()== aboutMenuItem)

            {
              JOptionPane.showMessageDialog(null, "This Software was made for Editors to. \nDiagnose BNA Bloomberg client FTP site.");

            }
          }

        };
        aboutMenuItem.addActionListener(aboutListener);             
      }

    };
    EventQueue.invokeLater(runner);

  }

}

Command Class:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.JOptionPane;


public class CommandClass extends FTP {




  public String line, output = "";



  public String getCommand(String ftpSite)

  {


    String command = "ping ";


    try
    {
      Process p = Runtime.getRuntime().exec(command +ftpSite);

      BufferedReader readOutput = new BufferedReader(new InputStreamReader (p.getInputStream()));


      JOptionPane.showMessageDialog(null, "FTP is connected");

      while ((line = readOutput.readLine()) != null)
      {

        System.out.println(line);   
        output += line + "\n";

      }
      readOutput.close();
    }
    catch (IOException e)
    {
      e.printStackTrace();

    }
    return output;
  }





}