Parsing Txt and XML files.

I have a Practice project for my finals and I cannot for the life of me figure out how to get this work right. The Professor has never gone over parsing or how to do the majority of the stuff in the project. She expects us to learn from each other and the internet. Right now I have the GUI and all the of buttons to work perfectly. I however cannot get the Frame Class to work with the Calling class and I'm not even entirely sure the XML parsing code is right. The program reads the information from an Access Database originally and needs to also be able to read and write XML and TXT files. I would really appreciate it if someone could help me with my coding and explain it so I can do good on the final next week.

MailList:

Code:

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// import libraries

import javax.swing.*;
import java.awt.*;

public class MailList
{
    public static void main(String[] args) {
   
        MailListFrame frame = new MailListFrame();
        frame.setTitle("MailListFrame");   
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(410, 220);
        frame.setVisible(true);
       
        // Get the dimension of the screen
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    int screenWidth = screenSize.width;
    int screenHeight = screenSize.height;

    // Get the dimension of the frame
    Dimension frameSize = frame.getSize();
    int x = (screenWidth - frameSize.width)/2;
    int y = (screenHeight - frameSize.height)/2;

    frame.setLocation(x, y);
    frame.setVisible(true);
    }
}

---

MailListFrame:

Code:

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// imports libraries
import javax.swing.JOptionPane;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.util.*;
import java.io.*;
import java.net.URL;
import java.util.Scanner;
import javax.swing.JFileChooser;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

public class MailListFrame extends JFrame implements ActionListener
{
    // instance variables - database

    Statement stmt;
    ResultSet rs;

   
    // instance variables - visual components+
   
   
    JPanel jpnlText = new JPanel();
    JTextField jfldLast = new JTextField(" ");
    JTextField jfldFirst = new JTextField(" ");
    JTextField jfldStreet = new JTextField(" ");
    JTextField jfldCity = new JTextField(" ");
    JTextField jfldState = new JTextField(" ");
    JTextField jfldZip = new JTextField(" ");
    JTextField jfldPhone = new JTextField(" ");
   
    //Menu Variables
    JMenuBar jmb = new JMenuBar();              // declare the menubar
    JMenu mnuFile = new JMenu("File");          // declare the "File" Menu
    JMenu mnuHelp = new JMenu("Help");          // declare the "Help" Menu
    JMenuItem mnu1Help = new JMenuItem("Help");          // declare the "Help" Submenu
    JMenuItem mnu1Load = new JMenuItem("Load");          // File submenu item "Load"
    JMenuItem mnu1Save = new JMenuItem("Save");
    JMenuItem mnu1Exit = new JMenuItem("Exit");// File submenu item "Save"
   
    //Button Variables
    JPanel jpnlBtn = new JPanel();
    JButton jbtnPrevious = new JButton("<-Previous");
    JButton jbtnNew = new JButton("New");
    JButton jbtnSave = new JButton("Save ");
    JButton jbtnDelete = new JButton("Delete");
    JButton jbtnNext = new JButton("Next->");
   
   
    // Constructor for objects of class MailListFrame
    public MailListFrame()
    {
       
        // Initialize database connection and create a Statemet object

     
            initializeDB();
 
        // Get the content pane of the frame and set Layout type
     
       
        Container container = getContentPane();
        container.setLayout(new BorderLayout());
       
     
       
       
        // pnlLabels Layout and Add Components
        JPanel jplbl = new JPanel();
        jplbl.setLayout(new GridLayout(7,1));
        jplbl.add(new JLabel("Last"));
        jplbl.add(new JLabel("First"));
        jplbl.add(new JLabel("Street"));
        jplbl.add(new JLabel("City"));
        jplbl.add(new JLabel("State"));
        jplbl.add(new JLabel("Zip"));
        jplbl.add(new JLabel("Phone"));


        // pnlFields Layout and Add Components
        JPanel jpnlText = new JPanel();
        jpnlText.setLayout(new GridLayout(7,1));
        jpnlText.add(jfldLast);
        jpnlText.add(jfldFirst);
        jpnlText.add(jfldStreet);
        jpnlText.add(jfldCity);
        jpnlText.add(jfldState);
        jpnlText.add(jfldZip);
        jpnlText.add(jfldPhone);
       
       
        // pnlButtons Layout and Add Components
       
        JPanel jpnlBtn = new JPanel();
        jpnlBtn.setLayout(new FlowLayout());
        jpnlBtn.add(jbtnPrevious);
        jpnlBtn.add(jbtnNew);
        jpnlBtn.add(jbtnSave);
        jpnlBtn.add(jbtnDelete);
        jpnlBtn.add(jbtnNext);
       
        // pnlMenu Layout and Add Components
           
        // add items to mnubar
        jmb.add(mnuFile);
        jmb.add(mnuHelp);
       
            // add items to mnuFile
        mnuFile.add(mnu1Load);
        mnuFile.add(mnu1Save);
        mnuHelp.add(mnu1Help);
        mnuFile.add(mnu1Exit);
           
         
           
        // add the populated menubar to "this" form
        this.setJMenuBar(jmb);
       
          // add event handlers to menu items
        mnuHelp.addActionListener(this);
        mnuFile.addActionListener(this);
        mnu1Load.addActionListener(this);
        mnu1Save.addActionListener(this);
        mnu1Help.addActionListener(this);
        mnu1Exit.addActionListener(this);
       
        // add event handlers to Button items
        jbtnPrevious.addActionListener(this);
        jbtnNew.addActionListener(this);
        jbtnSave.addActionListener(this);
        jbtnDelete.addActionListener(this);
        jbtnNext.addActionListener(this);
       
        // add panels to container
       
        container.add(jplbl, BorderLayout.WEST);
        container.add(jpnlBtn, BorderLayout.SOUTH);
        container.add(jpnlText, BorderLayout.CENTER);
       
               
        // register event handlers with all buttons
       
       
        }
   
     

   
    private void initializeDB()  {
        Connection connection;
        try {
            // Load the JDBC driver
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

      System.out.println("Driver loaded");

      // Establish a connection
      connection = DriverManager.getConnection
      ("jdbc:odbc:MailList");               
     
      System.out.println("Database connected");

      // Create a statement
     
      stmt = connection.createStatement(
            ResultSet.TYPE_SCROLL_INSENSITIVE,
            ResultSet.CONCUR_UPDATABLE);
           
      rs = stmt.executeQuery("SELECT Last, First, Street, City, State, Zip, Phone FROM MailList");
     
      rs.first();
                 
      String Last = rs.getString("Last");
      String First = rs.getString("First");
      String Street = rs.getString("Street");
      String City = rs.getString("City");
      String State = rs.getString("State");
      String Zip = rs.getString("Zip");
      String Phone = rs.getString("Phone");
       
   
       
      jfldLast.setText(Last);
      jfldFirst.setText(First);
      jfldStreet.setText(Street);
      jfldCity.setText(City);
      jfldState.setText(State);
      jfldZip.setText(Zip);
      jfldPhone.setText(Phone);

    }
    catch (Exception ex) {
      System.out.println(ex.toString());
    }
    }
   
    // Handler for an Action event (Component Clicked)
    public void actionPerformed(ActionEvent e) {
   
        //Actions for the Buttons
        if (e.getSource() == jbtnPrevious) jbtnPrevious_Click();
        if (e.getSource() == jbtnNew) jbtnNew_Click();
        if (e.getSource() == jbtnSave) jbtnSave_Click();
        if (e.getSource() == jbtnDelete) jbtnDelete_Click();
        if (e.getSource() == jbtnNext) jbtnNext_Click();
       
       
        //Actions for the Menu Items
        if (e.getSource() == mnu1Save) mnu1Save_Click();
        if (e.getSource() == mnu1Load) mnu1Load_Click();
        if (e.getSource() == mnu1Help) mnu1Help_Click();
        if (e.getSource() == mnu1Exit) mnu1Exit_Click();
    }

    // User defined methods   

    private void mnu1Load_Click() {
      try{
        // instantialte the JFileChooser component
        JFileChooser fileChooser = new JFileChooser();

        // set filters for JFileChooser
        fileChooser.addChoosableFileFilter(new TextFilter());
        fileChooser.addChoosableFileFilter(new XMLFilter());
     
        if (fileChooser.showOpenDialog(null)
            == JFileChooser.APPROVE_OPTION) {
                // Get the selected file
            File file = fileChooser.getSelectedFile();

            // Create a Scanner for the file
            Scanner input = new Scanner(file);

            // Read text from the file
            while (input.hasNext()) {
              //Reads the TxT or XML files here.
             
              /*String Last = string.String[0];
              String First = rs.getString("First");
              String Street = rs.getString("Street");
              String City = rs.getString("City");
              String State = rs.getString("State");
              String Zip = rs.getString("Zip");
              String Phone = rs.getString("Phone");
       
   
       
              jfldLast.setText(Last);
              jfldFirst.setText(First);
              jfldStreet.setText(Street);
              jfldCity.setText(City);
              jfldState.setText(State);
              jfldZip.setText(Zip);
              jfldPhone.setText(Phone);*/
              }
           
   
            // Close the file
            input.close();
        }
        else {
          System.out.println("No file selected");
        }
    }
    catch (Exception ex) {
      System.out.println(ex.toString());
}
}
   
    /**
  * inner classess to create custom FileFilters
    */
  class TextFilter extends FileFilter {

    public boolean accept(File f) {
        // needed to allow directory browsing
        if (f.isDirectory()) return true;
        String s = f.getName();
        int i = s.lastIndexOf('.');

        if (i > 0 && i < s.length() - 1)
            // search-for file extension is .equals string argument
            if (s.substring(i + 1).toLowerCase().equals("txt"))
                return true;

        return false;
    }

    // description to display in JFileChooser combobox
    public String getDescription() {
        return "Text files (*.txt)";
    }
  }

  class XMLFilter extends FileFilter {

    public boolean accept(File f) {
        // needed to allow directory browsing
        if (f.isDirectory()) return true;
        String s = f.getName();
        int i = s.lastIndexOf('.');

        if (i > 0 && i < s.length() - 1)
            // search-for file extension is .equals string argument
            if (s.substring(i + 1).toLowerCase().equals("xml"))
                return true;

      return false;
    }

    // description to display in JFileChooser combobox
    public String getDescription() {
        return "XML files (*.xml)";
    }
  }
   
    private void mnu1Help_Click() {
            JOptionPane.showMessageDialog(null, "              Version 1 \n                  2011 \n Created by Donavan Payne" ,"Help",
                JOptionPane.INFORMATION_MESSAGE);       
    }
   
    private void mnu1Save_Click() {
        try{   
      rs.moveToCurrentRow();
     
      rs.updateString("Last", jfldLast.getText());
      rs.updateString("First", jfldFirst.getText());
      rs.updateString("Street", jfldStreet.getText());
      rs.updateString("City", jfldCity.getText());
      rs.updateString("State", jfldState.getText());
      rs.updateInt("Zip", Integer.parseInt(jfldZip.getText()));
      rs.updateString("Phone", jfldPhone.getText());
     
      rs.updateRow();   
      rs.moveToCurrentRow();
      rs.refreshRow();
    }
    catch (Exception ex){
    System.out.println("Cannot save");
    }
    }

    private void mnu1Exit_Click() {
        System.exit(0);   
        //JOptionPane.showMessageDialog(null, "Exit" ,"Menu Item Selected",
            //    JOptionPane.INFORMATION_MESSAGE);       
    }

    private void jbtnPrevious_Click() {
        try { 
      rs.previous();
      String Last = rs.getString("Last");
      String First = rs.getString("First");
      String Street = rs.getString("Street");
      String City = rs.getString("City");
      String State = rs.getString("State");
      String Zip = rs.getString("Zip");
      String Phone = rs.getString("Phone");
       
   
       
      jfldLast.setText(Last);
      jfldFirst.setText(First);
      jfldStreet.setText(Street);
      jfldCity.setText(City);
      jfldState.setText(State);
      jfldZip.setText(Zip);
      jfldPhone.setText(Phone);
    }
      catch(Exception ex) {
            System.out.println("No Previous Files");
        }
   
    }

    private void jbtnNew_Click() {
            try{
      rs.last();
      rs.moveToCurrentRow();
     
      String Last = " ";
      String First = " ";
      String Street = " ";
      String City = " ";
      String State = " ";
      String Zip = "";
      String Phone = "";
       
      jfldLast.setText(Last);
      jfldFirst.setText(First);
      jfldStreet.setText(Street);
      jfldCity.setText(City);
      jfldState.setText(State);
      jfldZip.setText(Zip);
      jfldPhone.setText(Phone);
       

     
      rs.updateString("Last", jfldLast.getText());
      rs.updateString("First", jfldFirst.getText());
      rs.updateString("Street", jfldStreet.getText());
      rs.updateString("City", jfldCity.getText());
      rs.updateString("State", jfldState.getText());
      rs.updateInt("Zip", Integer.parseInt(jfldZip.getText()));
      rs.updateString("Phone", jfldPhone.getText());
     
      rs.insertRow();   
      rs.moveToCurrentRow();
      rs.refreshRow();
     
    }
   
    catch(Exception ex) {
            System.out.println("Cannot create a new row");
        }
   
  }

    private void jbtnDelete_Click() {
            try{
                rs.deleteRow();
                rs.previous();
            }
            catch(Exception ex) {
            System.out.println("Cannot delete row");
        }
    }

    private void jbtnSave_Click() {
            try{   
      /*String Last ;
      String First ;
      String Street;
      String City ;
      String State ;
      String Zip ;
      String Phone;*/
     
      rs.moveToCurrentRow();
     
      rs.updateString("Last", jfldLast.getText());
      rs.updateString("First", jfldFirst.getText());
      rs.updateString("Street", jfldStreet.getText());
      rs.updateString("City", jfldCity.getText());
      rs.updateString("State", jfldState.getText());
      rs.updateInt("Zip", Integer.parseInt(jfldZip.getText()));
      rs.updateString("Phone", jfldPhone.getText());
     
      rs.updateRow();   
      rs.moveToCurrentRow();
      rs.refreshRow();
       

    }
    catch (Exception ex){
    System.out.println("Cannot save");
    }
    }
   
    private void jbtnNext_Click() {
        try {
      rs.next();
       
      String Last = rs.getString("Last");
      String First = rs.getString("First");
      String Street = rs.getString("Street");
      String City = rs.getString("City");
      String State = rs.getString("State");
      String Zip = rs.getString("Zip");
      String Phone = rs.getString("Phone");
       
   
       
      jfldLast.setText(Last);
      jfldFirst.setText(First);
      jfldStreet.setText(Street);
      jfldCity.setText(City);
      jfldState.setText(State);
      jfldZip.setText(Zip);
      jfldPhone.setText(Phone);

    }
    catch(Exception ex) {
            System.out.println("No More Files");
        }
   
    }
}

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ParseLib:

Code:

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// contains generalized code for parsing (and assembling) recods for comma delimited and xml files
//import libraries
import java.util.*;
import java.io.*;
public  class ParseLib
{
    //declare properties and variables to be used in class
    private static ArrayList lines = new ArrayList(); 
    private static String inputLines = "";
 
    public ParseLib()
    { 
    }
    // returns an array of field values parsed from a comma delimited file (method)
    public static String[] parseString(ArrayList strvar, String delimiter, int index) throws Exception {
      //sets up an array and get size of arraylist
      String []recordsarray = new String[strvar.size()];
      //sets the arraylist to an array
      strvar.toArray(recordsarray);
      //creates a string
      String single;
      //sets the string to array with an index of 0
      single = recordsarray[index];
      //creates an array
      String []newstring = new String[7];
      //sets new array to an array without the ,
      newstring = single.split(",");
      return newstring;
     
    }
    //creates a method to read in the file given and adds it to an array
    public static ArrayList readcommadata(String filename) throws Exception {
          //scans in the given file
          Scanner scan = new Scanner(new File(filename));
          //sets an int to 0
          int i=0;
          //while the scanner reads lines
          while (scan.hasNext()){
                //sets arraylist to lines and nextlines
                lines.add(scan.nextLine());
                //increments
                i++;
                }
      //close scanner
      scan.close();
      //returns an arraylist
      return lines;
    }
    // returns an array of field values parsed from a record in an xml file
    public static String[] parsexml(ArrayList strvar, String delimiter, int index) throws Exception {
      //creates an array and sets it to arraylist and its size
      String []recordsarray = new String[strvar.size()];
      //turns arraylist to array
      strvar.toArray(recordsarray);
      //creates a string
      String single1;
      //sets string of delimiters
      String delims = "< >=\"";
      //sets string to array with an index
      single1 = recordsarray[index];
      //creates new string array
      String []newstring = new String[7];
      //sets string array to string with delimiters taken out
      newstring = single1.split(delims);
      //System.out.println(newstring);
      //returns array
      return newstring;
     
    }
}
 
//}

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tl;dr

Recommended reading:
How to ask questions the smart way
SSCCE

db

How is it too long? I have a simple paragraph and all of my code.

Quote:

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Originally Posted by Sobutai

How is it too long? I have a simple paragraph and all of my code.

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Hence the SSCCE link.

db

Quote:

---

Originally Posted by Sobutai

How is it too long? I have a simple paragraph and all of my code.

---

It may be simple for you, but for us we have to go through it line by line trying to understand all the assumptions that you already know. We're all volunteers with our own work, family, and life responsibilities and our time is precious, and for a volunteer help forum, it is too much code, believe me. If you need our free help, we'll be happy to give it, but we would appreciate it if you put in the effort to make it easy for us to help you. Consider creating and posting an SSCCE

Sorry, Let me try to make this simpler.

I need the array in ParseLib:

Code:

---

public static String[] parseString(ArrayList strvar, String delimiter, int index) throws Exception {
      //sets up an array and get size of arraylist
      String []recordsarray = new String[strvar.size()];
      //sets the arraylist to an array
      strvar.toArray(recordsarray);
      //creates a string
      String single;
      //sets the string to array with an index of 0
      single = recordsarray[index];
      //creates an array
      String []newstring = new String[7];
      //sets new array to an array without the ,
      newstring = single.split(",");
      return newstring;
     
    }


     
    }

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To go to the Frame Class and have the Load menu button read an XML or TXT file (Only gave XML Code of ParseLib) and go into the text fields I have set up.

Code:

---

private void mnu1Load_Click() {
      try{
        // instantialte the JFileChooser component
        JFileChooser fileChooser = new JFileChooser();

        // set filters for JFileChooser
        fileChooser.addChoosableFileFilter(new TextFilter());
        fileChooser.addChoosableFileFilter(new XMLFilter());
     
        if (fileChooser.showOpenDialog(null)
            == JFileChooser.APPROVE_OPTION) {
                // Get the selected file
            File file = fileChooser.getSelectedFile();

            // Create a Scanner for the file
            Scanner input = new Scanner(file);

            // Read text from the file
            while (input.hasNext()) {
              //Reads the TxT or XML files here.
             
              String Last =
              String First =
              String Street =
              String City =
              String State =
              String Zip =
              String Phone =
       
   
       
              jfldLast.setText(Last);
              jfldFirst.setText(First);
              jfldStreet.setText(Street);
              jfldCity.setText(City);
              jfldState.setText(State);
              jfldZip.setText(Zip);
              jfldPhone.setText(Phone);*/
              }
           
   
            // Close the file
            input.close();
        }
        else {
          System.out.println("No file selected");
        }

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