HttpRequestParser.java

package com.founderdpt.comm.xworld.plugin.struts2.util;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.*;


/**
 * HttpRequestParser工具类
 */
public class HttpRequestParser {
	/**
	 * 分析url字符串,采用utf-8解码
	 * 
	 * @param urlString
	 * @return
	 */
	public static Request parse(String urlString) {
		return parse(urlString, "utf-8");
	}

	/**
	 * 分析url字符串,指定字符集进行解码
	 * 
	 * @param urlString
	 * @param enc
	 * @return
	 */
	public static Request parse(String urlString, String enc) {
		if (urlString == null || urlString.length() == 0) {
			return new Request();
		}
		int questIndex = urlString.indexOf('?');
		if (questIndex == -1) {
			return new Request(urlString);
		}
		String url = urlString.substring(0, questIndex);
		String queryString = urlString.substring(questIndex + 1, urlString
				.length());
		return new Request(url, getParamsMap(queryString, enc));
	}

	private static Map<String, String[]> getParamsMap(String queryString,
			String enc) {
		Map<String, String[]> paramsMap = new HashMap<String, String[]>();
		if (queryString != null && queryString.length() > 0) {
			int ampersandIndex, lastAmpersandIndex = 0;
			String subStr, param, value;
			String[] paramPair, values, newValues;
			do {
				ampersandIndex = queryString.indexOf('&', lastAmpersandIndex) + 1;
				if (ampersandIndex > 0) {
					subStr = queryString.substring(lastAmpersandIndex,
							ampersandIndex - 1);
					lastAmpersandIndex = ampersandIndex;
				} else {
					subStr = queryString.substring(lastAmpersandIndex);
				}
				paramPair = subStr.split("=");
				param = paramPair[0];
				value = paramPair.length == 1 ? "" : paramPair[1];
				try {
					value = URLDecoder.decode(value, enc);
				} catch (UnsupportedEncodingException ignored) {
				}
				if (paramsMap.containsKey(param)) {
					values = paramsMap.get(param);
					int len = values.length;
					newValues = new String[len + 1];
					System.arraycopy(values, 0, newValues, 0, len);
					newValues[len] = value;
				} else {
					newValues = new String[] { value };
				}
				paramsMap.put(param, newValues);
			} while (ampersandIndex > 0);
		}
		return paramsMap;
	}
}