Android应用经常会和服务器端交互，这就需要手机客户端发送网络请求，下面介绍四种常用网络请求方式，我这边是通过Android单元测试来完成这四种方法的。

// 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");  
    }  
}    

// 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");  
    }  
}  

以上是一些部分代码，测试的时候在测试类中运行对应的测试方法即可。