base64com.java

javabase64,是一个基于java的Base64编码程序

/*
 *  com.twiek.Utils.Base64* package version 1.0, Base64 encoding/decoding utilities
 *  Copyright (C) 2003  Brent "Twiek" Crowe.  All rights reserved.
 *
 *  This file is part of the com.twiek.Utils.Base64* package
 *
 *  The com.twiek.Utils.Base64* package is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.twiek.Utils;

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

/**
 *
 * @version $Revision: 1.0 $
 * @author Brent "Twiek" Crowe <[e-mail]>
 */
public final class Base64Com {

  private Base64Com() {}

  public static char menu() {

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String buf = "";
    char selection = ' ';

    do {

      System.out.println();
      System.out.println("-----Choose-----");
      System.out.println("E)ncode a string");
      System.out.println("D)ecode a string");
      System.out.println("Q)uit");
      System.out.print("Selection: ");

      try {

        buf = in.readLine();

      }
      catch(IOException e) {}

      buf = buf.toUpperCase();
      selection = buf.charAt(0);

    } while(selection != 'E' && selection != 'D' && selection != 'Q');

    if(selection == 'Q') {

      System.out.println("GoodBye!");
      System.exit(0);

    }

    System.out.println();

    return selection;

  }

  private static void usage() {

    System.out.println();
    System.out.println("Usage: [-e][-d] <String to encode/decode>");
    System.out.println("    -e - Encode String");
    System.out.println("    -d - Decode String");
    System.out.println();
    System.out.println("Without parameters, Base64Com will enter interactive mode");

  }

  private static void copyright() {

    System.out.println("Base64Com v1.0, Copyright (C) 2003  Brent \"Twiek\" Crowe");
    System.out.println("Base64Com comes with ABSOLUTELY NO WARRANTY; for details");
    System.out.println("see LICENSE.txt.  This is free software, and you are welcome");
    System.out.println("to redistribute it under certain conditions; see LICENSE.txt");
    System.out.println("for details.");

  }

  public static void main(String[] args) throws Exception {

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String text,
           encoded,
           decoded;
    char selection;

    copyright();

    if(args.length != 0) {

      if(!(args[0].equals("-e") || args[0].equals("-d")) || args.length < 2) {

        usage();
        System.exit(0);

      }
      else if(args[0].equals("-e")) {

        System.out.println("Encoding [" + args[1] + "]:");
        System.out.println();
        System.out.println(Base64.encode(args[1]));

      }
      else if(args[0].equals("-d")) {

        System.out.println("Decoding [" + args[1] + "]:");
        System.out.println();
        System.out.println(Base64.decode(args[1]));

      }

    }
    else {

      for(;;) {

        selection = menu();

        if(selection == 'E') {

          System.out.print("String to encode: ");
          text = in.readLine();
          System.out.println(Base64.encode(text));

        }
        else {

          System.out.print("String to decode: ");
          text = in.readLine();
          System.out.println(Base64.decode(text));

        }

      }

    }

  }

}