mimeutility.java

聊天程序

/*
 * @(#)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 1.5 2003/05/12 12:35:17 xrath Exp $
 */
package rath.msnm.msg;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
/**
 *
 *
 * @author Jang-Ho Hwang, [e-mail]
 * @version $Id: MimeUtility.java,v 1.5 2003/05/12 12:35:17 xrath 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();
	}
};