android上联网

    /**      * 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;			 }				}