如何从Servlet使用Facebooks -API

Question

我需要从J2EE应用程序(服务器端)访问Facebook。我首先看了一下这个项目：http://code.google.com/p/facebook-java-api/，但由于我需要创建Facebook-Events并邀请人们，这并没有什么帮助。

因此，我想我需要使用Graph API，但我不知道如何执行所需的HTTP POST请求-特别是如何附加nedded属性。

Answer 1

您可以使用java.net.URLConnection来执行以下操作：

String url = "http://facebook.com/some/api";
String charset = "UTF-8";
String param1 = URLEncoder.encode("value1", charset);
String param2 = URLEncoder.encode("value2", charset);
String query = String.format("param1=%s&param2=%s", param1, param2);

URLConnection urlConnection = new URL(url).openConnection();
urlConnection.setUseCaches(false);
urlConnection.setDoOutput(true); // Triggers POST.
urlConnection.setRequestProperty("accept-charset", charset);
urlConnection.setRequestProperty("content-type", "application/x-www-form-urlencoded");

OutputStreamWriter writer = null;
try {
    writer = new OutputStreamWriter(urlConnection.getOutputStream(), charset);
    writer.write(query); // Write POST query string (if any needed).
} finally {
    if (writer != null) try { writer.close(); } catch (IOException logOrIgnore) {}
}

InputStream response = urlConnection.getInputStream();
// Now do your thing with the facebook response.

或者，您也可以使用更方便的HttpClient API来实现这一点：

String url = "http://facebook.com/some/api";
String charset = "UTF-8";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("param1", "value1"));
params.add(new BasicNameValuePair("param2", "value2"));
UrlEncodedFormEntity query = new UrlEncodedFormEntity(params, charset);

HttpClient client = new DefaultHttpClient()
HttpPost post = new HttpPost(url);
post.setEntity(query);
InputStream response = client.execute(post).getEntity().getContent();
// Now do your thing with the facebook response.