android下联网

    /** 
     * HTTP请求 
     * @author  hsz
     * 
     */  
    public class HttpRequest   
    {  
    
    		/** 
		     * 通过URL和URLConnection get方式提交参数给服务器 
		     * @param path 
		     * @param params 
		     * @param enc 
		     * @return 
		     * @throws Exception 
		     */  
    		private static boolean sendGETRequest (String path,
    										Map<String, String> params) throws Exception{
          //发送地http://192.168.100.91:8080/videoService
          //			/login?username=abc&password=123
          // StringBuilder是用来组拼请求地址和参数
          StringBuilder sb = new StringBuilder();
          sb.append(path).append("?");
          if(params!=null &&params.size()!=0){
             for (Map.Entry<String, String> entry : params.entrySet()) {
										//如果请求参数中有中文，需要进行URLEncoder编码
                    sb.append(entry.getKey()).append("=")
                    	.append(URLEncoder.encode(entry.getValue(), "utf-8"));
                    sb.append("&");                          
             }
             sb.deleteCharAt(sb.length()-1);
          }

          URL url = new URL(sb.toString());
          HttpURLConnection conn = (HttpURLConnection) url.openConnection();
          conn.setConnectTimeout(5000);
          conn.setRequestMethod("GET");
          if(conn.getResponseCode()==200){     						   
                 return true;
          }
          return false;
       }

      /**
       *我们先从IE浏览器中使用POST方法发送一次：（下面内容可以用HttpWatch看到）
			 *POST /videoService/login HTTP/1.1
			 *Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, 
			 *			application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, 
			 *			application/msword, application/QVOD, application/QVOD, 
			*Referer: http://192.168.100.91:8080/videoService/login.jsp
			*Accept-Language: zh-CN,en;q=0.5
			*User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; 
			*				.NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0)
			*Content-Type: application/x-www-form-urlencoded//POST请求这个一定要设置
			*Accept-Encoding: gzip, deflate
			*Host: 192.168.100.91:8080
			*Content-Length: 26//还有发送内容长度也要设置
			*Connection: Keep-Alive
			*Cache-Control: no-cache
			*Cookie: JSESSIONID=7E1435CB8A071D07A430453250348C41			
			*username=asd&password=1234//这里是请求体部分，一共26个字节，与Content-Length长度一样
			*/

			/** 
	     * 通过URL和URLConnection post方式提交参数给服务器 
	     * @param path 
	     * @param params 
	     * @param enc 
	     * @return 
	     * @throws Exception 
	     */  
			private static boolean sendPOSTRequest(String path,
										Map<String, String> params) throws Exception{
						// StringBuilder是用来组拼请求参数
            StringBuilder sb = new StringBuilder();
            if(params!=null &&params.size()!=0){
               for (Map.Entry<String, String> entry : params.entrySet()) {
                      sb.append(entry.getKey()).append("=")
                      	.append(URLEncoder.encode(entry.getValue(), "utf-8"));
                      sb.append("&");                          
               }
               sb.deleteCharAt(sb.length()-1);
            }

						// entity为请求体部分内容
						//如果有中文则以UTF-8编码为username=%E4%B8%AD%E5%9B%BD&password=123
            byte[] entity = sb.toString().getBytes();
            URL url = new URL(path);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setRequestMethod("POST");

						//要向外输出数据，要设置这个
            conn.setDoOutput(true);
            //内容类型Content-Type: application/x-www-form-urlencoded  
            //内容长度Content-Length:  
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("Content-Length", entity.length+"");
            OutputStream os = conn.getOutputStream();

						//以POST方式发送请求体,这时才真正开始联网
            os.write(entity);
            if(conn.getResponseCode()==200){
                   return true;
            }
            return false;
       }

			/**
			  *在遇上HTTPS安全模式或者操作cookie的时候使用HTTPclient会方便很多,也是android内部集成的 
        * 使用HTTPClient（开源项目）向服务器提交参数 
			  */		
			private static boolean sendPOSTRequestHttpClient(String path,
										Map<String, String> params) throws Exception{
					  //封装请求参数
					  List<NameValuePair> pair = new ArrayList<NameValuePair>();
					  if(params!=null&& !params.isEmpty()){
					   for(Map.Entry<String, String> entry:params.entrySet()){
					    pair.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
					   }
					  }
					  //把请求参数变成请求体部分
					  UrlEncodedFormEntity uee = new UrlEncodedFormEntity(pair, "utf-8");
					  //使用HttpPost对象设置发送的URL路径
					  HttpPost post = new HttpPost(path);
					  //发送请求体
					  post.setEntity(uee);
					  //创建一个浏览器对象，以把POST对象向服务器发送，并返回响应消息
					  DefaultHttpClient dhc = new DefaultHttpClient();
					  //执行post请求
					  HttpResponse response = dhc.execute(post);
					  if(response.getStatusLine().getStatusCode()==200){
						   Log.i("http", "httpclient");
						   
						   //获取返回实体
						   HttpEntity httpEntity = response.getEntity();

						   return true;
					  }
					  return false;
			 }		
		}