private static final String EXTM3U="#EXTM3U\n";
	private static final String EXTINF="#EXTINF:-1";

	private static StringBuilder sb;
	
	
	/**
	 * 获取mu3源
	 * @return
	 */
	public static String getIptv(){
		sb=new StringBuilder();
		List<IptvInfo> fileJson = getFileJson();
		sb.append(EXTM3U);
		
		for (int i = 0; i < fileJson.size(); i++) {
			sb.append(EXTINF);
			sb.append(" tvg-id=\"#\"".replace("#", fileJson.get(i).getTvgId()));
			sb.append(" tvg-name=\"#\"".replace("#", fileJson.get(i).getTvgName()));
			
			//获取最低延迟的logo
			List<String> logoUrls = fileJson.get(i).getLogoUrls();
			for (int k = 0; k < logoUrls.size(); k++) {
				if(isConnect(logoUrls.get(k))) {
					sb.append(" tvg-logo=\"#\"".replace("#", logoUrls.get(k)));
					break;
				}
			}
			
			sb.append(" group-title=\"#\"".replace("#", fileJson.get(i).getGroupTitle()));
			sb.append(",");
			
			//获取最低延迟的m3u源
			String validUrl="";
			String definition="";
			List<UrlInfo> urls=fileJson.get(i).getUrls();
			for (int j = 0; j < urls.size(); j++) {
				if(isConnect(urls.get(j).getUrl())) {
					validUrl=urls.get(j).getUrl();
					definition=urls.get(j).getDefinition();
					break;
				}
			}
			
			//根据url获取名字
			sb.append(fileJson.get(i).getRemarks());
			sb.append(definition);
			sb.append("\n");
			
			sb.append(validUrl);
			sb.append("\n");
		}
		
		return sb.toString();
	}
	
	
	/**
	 * 将json文件转Bean
	 * @return
	 */
	private static List<IptvInfo> getFileJson() {
		FileReader fileReader = new FileReader("classpath:iptv_source.json");
		String jsonArr = fileReader.readString();
		JSONArray array = JSONUtil.parseArray(jsonArr);
		return JSONUtil.toList(array, IptvInfo.class);
	}
	
	/** 
	  * 功能：检测当前URL是否可连接或是否有效, 
	  * 描述：最多连接网络 3 次, 如果 3 次都不成功，视为该地址不可用 
	  * @param  urlStr 指定URL网络地址 
	  * @return URL 
	  */  
	 public static synchronized boolean isConnect(String urlStr) {  
	     int counts = 0;  
	     boolean retu = false;  
	     if (urlStr == null || urlStr.length() <= 0) {                         
	         return false;                   
	     }  
	     while (counts < 1) {  
	         try {  
	        	 HttpResponse res = HttpRequest.get(urlStr).execute(); 
	             if (200 == res.getStatus()) {  
	                 retu = true;  
	                 //Console.log("可用:{}--{}",res.getStatus(),urlStr);  
	             }else {
	            	 retu = false;  
	                 Console.error("不可达:{}--{}",res.getStatus(),urlStr); 
	             }
	             break;  
	         }catch (Exception ex) {  
	             counts++;   
	             Console.error("连接第{}次,不可用:异常--{}",+counts,urlStr);  
	             continue;  
	         }  
	     }  
	     return retu;  
	 }
	 
	 
		public static String sendGet(String url, String param) {
			String result = "";
			BufferedReader in = null;
			try {
				String urlNameString = url + "?" + param;
				URL realUrl = new URL(urlNameString);
				// 打开和URL之间的连接
				URLConnection connection = realUrl.openConnection();
				// 设置通用的请求属性
				connection.setRequestProperty("accept", "*/*");
				connection.setRequestProperty("connection", "Keep-Alive");
				connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
				// 建立实际的连接
				connection.connect();
				// 获取所有响应头字段
				Map<String, List<String>> map = connection.getHeaderFields();
				// 遍历所有的响应头字段
				for (String key : map.keySet()) {
					System.out.println(key + "--->" + map.get(key));
				}
				// 定义 BufferedReader输入流来读取URL的响应
				in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
				String line;
				while ((line = in.readLine()) != null) {
					result += line;
				}
			} catch (Exception e) {
				System.out.println("发送GET请求出现异常！" + e);
				e.printStackTrace();
			}
			// 使用finally块来关闭输入流
			finally {
				try {
					if (in != null) {
						in.close();
					}
				} catch (Exception e2) {
					e2.printStackTrace();
				}
			}
			return result;
		}
	 
	 public static void main(String[] args) {
		 System.out.println(sendGet("https://live.v1.mk/aishang/cctv4hd", null));
		//System.out.println(getIptv());
	}