Android中的几种网络请求方式详解

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

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");

}

}
org.apache.http包中的HttpGet和HttpPost类

// 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");

}

}