import java.io.*;import java.net.*;import java.util.*;import com.heaton.bot.*;/** * Example program from Chapter 6 * Programming Spiders, Bots and Aggregators in Java * Copyright 2001 by Jeff Heaton * * * This example program parses a QIF file. This file * may come from either the Internet or a local drive. * * @author Jeff Heaton * @version 1.0 */public class ParseQIF {  /**   * This method will read lines from a QIF file,   * line by line. Each time that this method is   * called a new QIFElement is returned that   * contains all of the fields read from that   * entry.   *   * @param r A BufferedReader to read the QIF from,   * line by line.   * @return An array of fields read from one line   * of the QIF file.   */  public static QIFElement parseQIFLine(BufferedReader r)  {    boolean done=false;    QIFElement rtn = new QIFElement();    try {      while ( !done ) {        String str = r.readLine();        if ( str==null )          return null;        switch ( str.charAt(0) ) {        case '^':          return rtn;        case 'P':          rtn.payee = str.substring(1);          break;        case 'D':          rtn.date = str.substring(1);          break;        case 'U':          rtn.amount = str.substring(1);          break;        case 'N':          rtn.number = str.substring(1);          break;        case 'A':          int i=0;          for ( i=0;i<3;i++ ) {            if ( rtn.address[i]==null )              break;          }          if ( i<3 )            rtn.address[i] = str.substring(1);          break;        }      }    } catch ( IOException e ) {      return null;    }    return null;  }  /**   * Main entry point.   *   * @param args The first command line parameter specifies the URL or filename.   */  public static void main(String args[])  {    FileReader f=null;    BufferedReader r=null;    if ( args.length!=1 ) {      // display usage      System.out.println("Usage:");      System.out.println("javac ParseQIF [qif file or URL to parse]");      System.exit(0);    }    try {      // first try and open it as a file      f = new FileReader( new File(args[0]) );      r = new BufferedReader(f);    } catch ( FileNotFoundException e ) {      // if it fails as a file, try as a URL      try {        HTTPSocket http = new HTTPSocket();        http.send(args[0],null);        StringReader sr = new StringReader(http.getBody());        r = new BufferedReader(sr);      } catch ( UnknownHostException ee ) {        // if it fails as a URL too, give up        System.out.println("Can't open file or URL named: "                           + args[0] + "(" + ee + ")");        System.exit(0);      } catch ( IOException ee ) {        System.out.println( e );        System.exit(0);      }    }    // loop through each line and display    QIFElement a;    while ( (a=parseQIFLine(r)) != null ) {      System.out.println("Date:" + a.date );      System.out.println("Amount:" + a.amount );      System.out.println("Number:" + a.number );      System.out.println("Payee:" + a.payee );      System.out.println("Address Line 1:" + a.address[0] );      System.out.println("Address Line 2:" + a.address[1] );      System.out.println("Address Line 3:" + a.address[2] );      System.out.println("Category:" + a.category );      System.out.println("-------------");    }    // close out the file    try {      if ( r!=null )        r.close();      if ( f!=null )        f.close();    } catch ( IOException e ) {      System.out.println("Error:" + e );      System.exit(0);    }  }}/** * Used to hold one element from a QIF file. * * @author Jeff Heaton * @version 1.0 */class QIFElement {  public String date;  public String amount;  public String number;  public String payee;  public String address[] = new String[3];  public String category;}