如何使用Facebook來自Servlet的Graph-API

Question

我需要從J2EE-App（serverside）訪問Facebook。 我第一次看到這個項目：http://code.google.com/p/facebook-java-api/ ，但因爲我需要創建Facebook的事件和邀請的人這沒有幫助。

所以我想我需要使用Graph API，但Igot不知道如何執行所需的HTTP POST請求 - 尤其是如何附加nedded屬性。

Answer 1

可以使用java.net.URLConnection此：

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. 

另外，您也可以使用更convenienced HttpClient API此：

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.