Android 网络请求的方式



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

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");
	}
}

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。
原文链接：http://blog.csdn.net/zuolongsnail/archive/2011/04/29/6373051.aspx