mimeutility.java

J2me实现的MSN Messeger客户端程序。聊天、添加好友、删除好友、阻止好友

/*
 * @(#)MimeUtility.java
 *
 * Copyright (c) 2001-2002, JangHo Hwang
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 	1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 	2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * 	3. Neither the name of the JangHo Hwang nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *    $Id: MimeUtility.java,v 2.0 2004/12/21 16:15:08 chenzs Exp $
 */
package vitular.msnp.msg;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;

/**
 *
 *
 * @author Jang-Ho Hwang, [e-mail]
 * @version $Id: MimeUtility.java,v 2.0 2004/12/21 16:15:08 chenzs Exp $
 */
public class MimeUtility {
  public static String getURLEncodedString(String str) throws
      UnsupportedEncodingException {
    return getURLEncodedString(str, System.getProperty("file.encoding"));
  }

  public static String getURLEncodedString(String str, String encoding) throws
      UnsupportedEncodingException {
    StringBuffer sb = new StringBuffer();
    byte[] b = str.getBytes(encoding);
    for (int i = 0; i < b.length; i++) {
      sb.append("%");
      int value = (int) (b[i] < 0 ? b[i] + 0x100 : b[i]);
      String hexa = Integer.toHexString(value);
      if (hexa.length() == 1)
        sb.append("0");
      sb.append(hexa.toUpperCase());
    }
    return sb.toString();
  }

  public static String getURLDecodedString(String str) throws
      UnsupportedEncodingException {
    return getURLDecodedString(str, System.getProperty("file.encoding"));
  }

  public static String getURLDecodedString(String str, String encoding) throws
      UnsupportedEncodingException {
    StringBuffer sb = new StringBuffer();
    ByteArrayOutputStream bos = new ByteArrayOutputStream(64);
    boolean isURLEncode = false;
    for (int i = 0, len = str.length(); i < len; i++) {
      if (str.charAt(i) == '%') {
        int v = -1;
        try {
          v = Integer.valueOf(str.substring(i + 1, i + 3), 0x10).intValue();
          bos.write(v);
          isURLEncode = true;
          i += 2;
        }
        catch (NumberFormatException e) {
          sb.append(str.charAt(i));
        }
      }
      else {
        if (isURLEncode) {
          isURLEncode = false;
          sb.append(new String(bos.toByteArray(), encoding));
          bos.reset();
        }
        sb.append(str.charAt(i));
      }
    }
    if (isURLEncode)
      sb.append(new String(bos.toByteArray(), encoding));
    return sb.toString();
  }
}