Android中HTTP通信

1 Android中HTTP简介

HTTP作为Internet中广泛使用的协议，几乎所有的语言都支持HTTP通信，当然android也不例外。在android中，提供了HttpURLConnection、HttpGet、HttpPost来实现对http资源的访问。

2 提交HTTP GET请求与HTTP POST请求

private static final int REQUEST_SUCCESS =200;

       privatestatic final int REQUEST_FAIL = 404;

       /**

        * 发送HttpGet请求

        * @param url url地址，该种方式发送HTTP请求时，如果需要传递参数，则通过在url后拼接字符串的方式

        * @return 请求的内容

        */

       publicString loadUrl(String url) {

              Stringcontent = null;

              HttpGethttpGet = new HttpGet(url);

              try{

                     HttpResponseresponse = new DefaultHttpClient().execute(httpGet);

                     intstatusCode = response.getStatusLine().getStatusCode();

                     if(statusCode == REQUEST_SUCCESS) {

                            content= EntityUtils.toString(response.getEntity());

                     }else if (statusCode == REQUEST_FAIL) {

                            content= "请求失败！";

                     }

              }catch (ClientProtocolException e) {

                     e.printStackTrace();

              }catch (IOException e) {

                     e.printStackTrace();

              }

             

              returncontent;

       }

       /**

        * 发送HttpPost请求

        * @param url url地址

        * @param params 参数

        * @return 请求内容

        */

       publicString loadUrl(String url, HashMap<String, String> params) {

              Stringcontent = null;

              HttpPosthttpPost = new HttpPost(url);

              List<NameValuePair>list = new ArrayList<NameValuePair>();

              Iterator<String>iterator = params.keySet().iterator();

              while(iterator.hasNext()) {

                     Stringkey = iterator.next();

                     list.add(newBasicNameValuePair(key, params.get(key)));

                     iterator.next();

              }

              try{

                     httpPost.setEntity(newUrlEncodedFormEntity(list, HTTP.UTF_8));

                     HttpResponseresponse = new DefaultHttpClient().execute(httpPost);

                     intstatusCode = response.getStatusLine().getStatusCode();

                     if(statusCode == REQUEST_SUCCESS) {

                            content= EntityUtils.toString(response.getEntity());

                     }else if (statusCode == REQUEST_FAIL) {

                            content= "请求失败！";

                     }

              }catch (UnsupportedEncodingException e) {

                     e.printStackTrace();

              }catch (ClientProtocolException e) {

                     e.printStackTrace();

              }catch (IOException e) {

                     e.printStackTrace();

              }

              returncontent;

       }

 

以上提供了两个方法，是java或android中发送HttpGet或HttpPost请求的两种方式。