Facebook Graph API SSL套接字手抖异常

Question

这是iam使用graph api测试facebook数据收集的示例程序。在我的整个项目中，iam无法找到错误的根本原因。它第一次从程序中收集数据。但第二次显示ssl异常。

public class Testing {

    public static void main(String[] args) throws IOException {

        // Make a URL to the web page
        boolean flag=false;
        int count=0;
        while(true)
        {

            count++;

            if(count==2)
            {

                flag=false;
            }

        System.out.println(new Date());
        URL url = new URL("https://graph.facebook.com/fql?q=select+message,post_id,created_time,actor_id,attachment,comments,created_time,impressions,likes,message_tags,place,share_count+from+stream+where+source_id+in(select+page_id+from+page+where+username=%27ATT%27)+and+created_time>1368439594&access_token=[HERE STANDS MY ACCESSTOKEN]");
        System.out.println(new Date());
        // Get the input stream through URL Connection
        URLConnection con = url.openConnection();
        InputStream is =con.getInputStream();

        // Once you have the Input Stream, it's just plain old Java IO stuff.

        // For this case, since you are interested in getting plain-text web page
        // I'll use a reader and output the text content to System.out.

        // For binary content, it's better to directly read the bytes from stream and write
        // to the target file.


        BufferedReader br = new BufferedReader(new InputStreamReader(is));

        String line = null;

        // read each line and write to System.out
        while ((line = br.readLine()) != null) {
            System.out.println(line);
        }

        }
    }
}

请指导我解决这个问题。

Answer 1

您的URL是HTTPS URL，这意味着它使用SSL，但您尝试使用urlconnection打开连接。要打开HTTPS URL，您应该使用HttpSurlConnection:

final HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

有了这个改变，它对我起作用了。；）