使用HashMap对象传递url參数有用工具类

代码例如以下：

package com.yanek.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class HttpUtil {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		Map<String, String> paramValues = new HashMap<String, String>();
		paramValues.put("b", "2");
		paramValues.put("a", "1");
		paramValues.put("c","3");
		paramValues.put("d","4");
		paramValues.put("e","5");
		System.out.println("post params：：：："+getParams("post",paramValues));
		System.out.println("get params：：：："+getParams("get",paramValues));
		System.out.println("post params：：：："+getParamsOrderByKey("post",paramValues));
		System.out.println("get params：：：："+getParamsOrderByKey("get",paramValues));

	}
	/**
	 * 得到參数列表字符串
	 * @param method   请求类型 get or  post
	 * @param paramValues 參数map对象
	 * @return  參数列表字符串
	 */
	public static String getParams(String method,Map<String, String> paramValues)
	{
		String params="";
		Set<String> key = paramValues.keySet();
		String beginLetter="";
		if (method.equalsIgnoreCase("get"))
		{
			beginLetter="?

";
		}

		for (Iterator<String> it = key.iterator(); it.hasNext();) {
			String s = (String) it.next();
			if (params.equals(""))
			{
				params += beginLetter + s + "=" + paramValues.get(s);
			}
			else
			{
				params += "&" + s + "=" + paramValues.get(s);
			}
		}
		return params;
	}

	/**
	 * 依照key排序得到參数列表字符串
	 * @param method   请求类型 get or  post
	 * @param paramValues 參数map对象
	 * @return  參数列表字符串
	 */
	public static String getParamsOrderByKey(String method,Map<String, String> paramValues)
	{
		String params="";
		Set<String> key = paramValues.keySet();
		String beginLetter="";
		if (method.equalsIgnoreCase("get"))
		{
			beginLetter="?";
		}
		List<String> paramNames = new ArrayList<String>(paramValues.size());
		paramNames.addAll(paramValues.keySet());
		Collections.sort(paramNames);
		for (String paramName : paramNames) {

			if (params.equals(""))
			{
				params += beginLetter + paramName + "=" + paramValues.get(paramName);
			}
			else
			{
				params += "&" + paramName + "=" + paramValues.get(paramName);
			}
		}

		return params;
	}

}

输出例如以下：

post params：：：：d=4&e=5&b=2&c=3&a=1
get params：：：：?d=4&e=5&b=2&c=3&a=1
post params：：：：a=1&b=2&c=3&d=4&e=5
get params：：：：?a=1&b=2&c=3&d=4&e=5