querystring.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * Copyright (c) 2001 Sun Microsystems, Inc. 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. The end-user documentation included with the redistribution,
 * if any, must include the following acknowledgment:
 * "This product includes software developed by the
 * Sun Microsystems, Inc. for Project JXTA."
 * Alternately, this acknowledgment may appear in the software itself,
 * if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 * must not be used to endorse or promote products derived from this
 * software without prior written permission. For written
 * permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 * nor may "JXTA" appear in their name, without prior written
 * permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 *
 *====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA. For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: QueryString.java,v 1.4 2002/06/05 22:30:48 bondolo Exp $
 */

package net.jxta.impl.endpoint.servlethttp;

import java.util.*;
import java.net.*;

/** Simple class that can generate query strings. Not thread safe. **/
public class QueryString {   

    /** the string so far **/
    private String query;
    
    public QueryString() {
	query = "";
    }
    
    /** adds name,value to the current string **/
    public void add(Object name, Object value) {
	
	if (!query.trim().equals(""))
	    query += "&";
	
	query += URLEncoder.encode(name.toString()) + "=" +
	    URLEncoder.encode(value.toString());
    }
 
    /** Returns a HashMap of the String names and values in a querystring. 
	Does not handle names with multiple values well. If there is a name 
	with multiple values, only the last value will be in the map.
     **/
    public static HashMap parse(String queryString) {

	if (queryString==null)
	    return null;
	
	HashMap map = new HashMap();

	if (queryString.trim().equals(""))
	    return map;

	StringTokenizer tok =
	    new StringTokenizer(queryString, "&");
	String nameValuePair, name, value;
	StringTokenizer tempTok;
	int index, numNames=0;
	while(tok.hasMoreTokens()) {
	    nameValuePair = tok.nextToken();
	    tempTok = new StringTokenizer(nameValuePair,
					  "=");
	    name = URLDecoder.decode(tempTok.nextToken());
	    if (tempTok.hasMoreTokens())
		value = URLDecoder.decode(tempTok.nextToken());
	    else
		value = "";
	    
	    map.put (name,value);
	}

	return map;
    }

    public String toString() {
	return query;
    }
}