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，还不清楚Android的单元测试的同学们请看Android开发技巧总结中的Android单元测试的步骤一文。

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

// 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");
}
}

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