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; }}
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