URL工具类

package com.code.util;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;

public class URLHanlder {
	
	/**
	 * 发送 HTTP 请求获取输入流
	 * @param str
	 * @param params
	 * @return
	 */
	public static InputStream getInputStream(String str,Map<String,String> params){
		URL url = null;
		try {
			if(params!=null&&params.size()!=0){
				StringBuffer sb = new StringBuffer();
				int index = 0;
				if(str.indexOf("?")!=-1){
					sb.append("&");
				}else{
					sb.append("?");
				}
				for (String s : params.keySet()) {
					sb.append(s);
					sb.append("=");
					sb.append(params.get(s));
					if(params.size()-1!=index){
						sb.append("&");
					}
					index++;
				}
				str+=sb.toString();
			}
			url = new URL(str);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			return conn.getInputStream();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * 发送 HTTP 请求获取输入流
	 * @param str
	 * @return
	 */
	public static InputStream getInputStream(String str){
		return getInputStream(str,null);
	}
}