Android中的几种网络请求方式详解

java.net包中的HttpURLConnection类

Get方式

// 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

// 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");
    }
}

org.apache.http包中的HttpGet和HttpPost类

Get方式

// 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");
    }
}

Post方式

// 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");
    }
}