android网络通信

android提供两种通信方式：HTTP和socket，其中支持HTTP协议的工具类有HttpURLConnection和URL，还有Apache的工具包HTTPClient。HttpURLConnection提供了最基础的HTTP通信方式。而HTTPClient则功能更加强大，提供了对Cookie，SSl，HTTPS的支持。简而言之，HTTPClient相当于PC上浏览器的API封装。而android中的socket何java的socket基本一致。

HTTP协议和Socket协议最大的区别就是Socket是长连接的，而HTTP是短连接的。

下面给出HTTP通信的例子[POST]：

public static boolean sendPostRequest(String path, Map<String, String> params, String enc) throws Exception{StringBuilder sb = new StringBuilder();/***组建Post请求方式的请求内容*/if(params!=null && !params.isEmpty()){for(Map.Entry<String, String> entry : params.entrySet()){sb.append(entry.getKey()).append('=').append(URLEncoder.encode(entry.getValue(), enc)).append('&');}sb.deleteCharAt(sb.length()-1);}byte[] entitydata = sb.toString().getBytes();//得到实体的二进制数据URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.setRequestMethod("POST");conn.setConnectTimeout(5 * 1000);//如果通过post提交数据，必须设置允许对外输出数据，设置内容类型，设置内容长度conn.setDoOutput(true);conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");conn.setRequestProperty("Content-Length", String.valueOf(entitydata.length));OutputStream outStream = conn.getOutputStream();outStream.write(entitydata);outStream.flush();outStream.close();if(conn.getResponseCode()==200){return true;}return false;}

下面给出HTTP通信的例子[GET]：

public static boolean sendGetRequest(String path, Map<String, String> params, String enc) throws Exception{/***组建GET请求方式的请求内容*/StringBuilder sb = new StringBuilder(path);sb.append('?');for(Map.Entry<String, String> entry : params.entrySet()){sb.append(entry.getKey()).append('=').append(URLEncoder.encode(entry.getValue(), enc)).append('&');}sb.deleteCharAt(sb.length()-1);URL url = new URL(sb.toString());HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5 * 1000);if(conn.getResponseCode()==200){return true;}return false;}

下面给出HTTP通信的例子[HTTPClient]：

public static boolean sendRequestFromHttpClient(String path, Map<String, String> params, String enc) throws Exception{List<NameValuePair> paramPairs = new ArrayList<NameValuePair>();if(params!=null && !params.isEmpty()){for(Map.Entry<String, String> entry : params.entrySet()){paramPairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));}}UrlEncodedFormEntity entitydata = new UrlEncodedFormEntity(paramPairs, enc);//得到经过编码过后的实体数据HttpPost post = new HttpPost(path); //formpost.setEntity(entitydata);DefaultHttpClient client = new DefaultHttpClient(); //浏览器HttpResponse response = client.execute(post);//执行请求if(response.getStatusLine().getStatusCode()==200){return true;}return false;}

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