java url request参数解析类

httpclient提供了一个，悲剧的是没法下载，只好按照它代码写了个，自己扩展了些：

package com.yunzu.jsoup;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

import org.apache.commons.httpclient.NameValuePair;

public class URLEncodedUtils {
	private static final String PARAMETER_SEPARATOR = "&";
	private static final String NAME_VALUE_SEPARATOR = "=";
	public static final String DEFAULT_CONTENT_CHARSET = "ISO-8859-1";

	/*
	 * assume each name is unique
	 */
	public static String getParameter(final String url, final String encoding,
			final String name) throws URISyntaxException {
		Map<String, String> mapparams = new HashMap<String, String>();
		List<NameValuePair> params = URLEncodedUtils.parse(new URI(url), "UTF-8");
		for (NameValuePair param : params) {
			mapparams.put(param.getName(), param.getValue());
		}
		
		return mapparams.get(name);
	}

	public static List<NameValuePair> parse(final URI uri, final String encoding) {
		List<NameValuePair> result = Collections.emptyList();
		final String query = uri.getRawQuery();
		if (query != null && query.length() > 0) {
			result = new ArrayList<NameValuePair>();
			parse(result, new Scanner(query), encoding);
		}
		return result;
	}

	public static void parse(final List<NameValuePair> parameters,
			final Scanner scanner, final String encoding) {
		scanner.useDelimiter(PARAMETER_SEPARATOR);
		while (scanner.hasNext()) {
			final String[] nameValue = scanner.next().split(
					NAME_VALUE_SEPARATOR);
			if (nameValue.length == 0 || nameValue.length > 2)
				throw new IllegalArgumentException("bad parameter");

			final String name = decode(nameValue[0], encoding);
			String value = null;
			if (nameValue.length == 2)
				value = decode(nameValue[1], encoding);
			parameters.add(new NameValuePair(name, value));
		}
	}

	private static String decode(final String content, final String encoding) {
		try {
			return URLDecoder.decode(content, encoding != null ? encoding
					: DEFAULT_CONTENT_CHARSET);
		} catch (UnsupportedEncodingException problem) {
			throw new IllegalArgumentException(problem);
		}
	}
}

调用也很简单：

			String sUrl = "http://book.sina.cn/prog/wapsite/books/h5/vipc.php?bid=217269&cid=293500&cp=1&sort=asc&PHPSESSID=0cbd7d80b00593b0b3d446bd97d781ab&vt=4&book_explore=1";
			List<NameValuePair> params;
			try {
				params = URLEncodedUtils.parse(new URI(sUrl), "UTF-8");
				for (NameValuePair param : params) {
				      System.out.println(param.getName() + " : " + param.getValue());
				    }
			} catch (URISyntaxException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			
			System.out.println("getparameter begin.........");
			try {
				System.out.println(URLEncodedUtils.getParameter(sUrl, "UTF-8", "bid"));
			} catch (URISyntaxException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			
			System.out.println("getparameter end.........");