android网络请求的几种方式，android怎么请求服务器资源

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android 在进行网络连接请求网络数据的时候.由于网络连接属于耗时的操作,在android 3.0之前(sdkversion 11之前) 如果不是在子线程完成网络连接操作,在执行连接之后并不会出现IOExcepiton.android 3.0之后会出现莫名的IOExcepiton

1) 第一种方式是使用java.net包中的HttpURLConnection类

// Get方式请求public static void requestByGet() throws Exception {     String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android";     // 新建一个URL对象     URL url = new URL(path);     // 打开一个HttpURLConnection连接     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();     // 设置连接超时时间     urlConn.setConnectTimeout(5 * 1000);     // 开始连接     urlConn.connect();     // 判断请求是否成功     if (urlConn.getResponseCode() == HTTP_200) {          // 获取返回的数据          byte[] data = readStream(urlConn.getInputStream());          Log.i(TAG_GET, "Get方式请求成功，返回数据如下：");          Log.i(TAG_GET, new String(data, "UTF-8"));     } else {          Log.i(TAG_GET, "Get方式请求失败");     }     // 关闭连接     urlConn.disconnect();}----------------------------------------------------------------------------------------------------// Post方式请求public static void requestByPost() throws Throwable {     String path = "https://reg.163.com/logins.jsp";     // 请求的参数转换为byte数组     String params = "id=" + URLEncoder.encode("helloworld", "UTF-8")               + "&pwd=" + URLEncoder.encode("android", "UTF-8");     byte[] postData = params.getBytes();     // 新建一个URL对象     URL url = new URL(path);     // 打开一个HttpURLConnection连接     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();     // 设置连接超时时间     urlConn.setConnectTimeout(5 * 1000);     // Post请求必须设置允许输出     urlConn.setDoOutput(true);     // Post请求不能使用缓存     urlConn.setUseCaches(false);     // 设置为Post请求     urlConn.setRequestMethod("POST");     urlConn.setInstanceFollowRedirects(true);     // 配置请求Content-Type     urlConn.setRequestProperty("Content-Type",               "application/x-www-form-urlencode");     // 开始连接     urlConn.connect();     // 发送请求参数     DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream());     dos.write(postData);     dos.flush();     dos.close();     // 判断请求是否成功     if (urlConn.getResponseCode() == HTTP_200) {          // 获取返回的数据          byte[] data = readStream(urlConn.getInputStream());          Log.i(TAG_POST, "Post请求方式成功，返回数据如下：");          Log.i(TAG_POST, new String(data, "UTF-8"));     } else {          Log.i(TAG_POST, "Post方式请求失败");     }}

2）第二种方式是使用org.apache.http包中的HttpGet和HttpPost类

</pre><pre name="code" class="java">------------------------------------------------------------------------------------------------------// HttpGet方式请求public static void requestByHttpGet() throws Exception {     String path = "https://reg.163.com/logins.jsp?id=helloworld&pwd=android";     // 新建HttpGet对象     HttpGet httpGet = new HttpGet(path);     // 获取HttpClient对象     HttpClient httpClient = new DefaultHttpClient();     // 获取HttpResponse实例     HttpResponse httpResp = httpClient.execute(httpGet);     // 判断是够请求成功     if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {          // 获取返回的数据          String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");          Log.i(TAG_HTTPGET, "HttpGet方式请求成功，返回数据如下：");          Log.i(TAG_HTTPGET, result);     } else {          Log.i(TAG_HTTPGET, "HttpGet方式请求失败");     }}------------------------------------------------------------------------------------------------------// HttpPost方式请求public static void requestByHttpPost() throws Exception {     String path = "https://reg.163.com/logins.jsp";     // 新建HttpPost对象     HttpPost httpPost = new HttpPost(path);     // Post参数     List<NameValuePair> params = new ArrayList<NameValuePair>();     params.add(new BasicNameValuePair("id", "helloworld"));     params.add(new BasicNameValuePair("pwd", "android"));     // 设置字符集     HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);     // 设置参数实体     httpPost.setEntity(entity);     // 获取HttpClient对象     HttpClient httpClient = new DefaultHttpClient();     // 获取HttpResponse实例     HttpResponse httpResp = httpClient.execute(httpPost);     // 判断是够请求成功     if (httpResp.getStatusLine().getStatusCode() == HTTP_200) {          // 获取返回的数据          String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");          Log.i(TAG_HTTPGET, "HttpPost方式请求成功，返回数据如下：");          Log.i(TAG_HTTPGET, result);     } else {          Log.i(TAG_HTTPGET, "HttpPost方式请求失败");     }}

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