调用https时Java 7类未找到异常

Question

We've got some code that works fine in Java 6:

    String g = "https://graph.facebook.com/oauth/access_token?client_id=xxxxx&redirect_uri="
            + URLEncoder.encode("http://www.bestcricketgame.com/facebook-login/", "UTF-8")
            + "&client_secret=xxxxxxx" 
            + "&code=" + code;

    URL u = new URL(g);
    URLConnection c = u.openConnection();
    BufferedReader in = new BufferedReader(new InputStreamReader(c.getInputStream()));

However, after installing java 7 and running the same code we get this:

java.lang.NoClassDefFoundError: sun.net.www.protocol.http.HttpURLConnection

java.lang.NoClassDefFoundError: sun.net.www.protocol.http.HttpURLConnection
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.<init>(HttpsURLConnectionImpl.java:86)
    at sun.net.www.protocol.https.Handler.openConnection(Handler.java:62)
    at sun.net.www.protocol.https.Handler.openConnection(Handler.java:57)
    at java.net.URL.openConnection(URL.java:971)
    at tipping.FacebookLogin.processFacebookLogin(FacebookLogin.java:39)
    at tipping.FacebookLoginCallbackServlet.service(FacebookLoginCallbackServlet.java:60)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:91) 

.....

Line 39 is : URLConnection c = u.openConnection();

The obvious thought is that maybe we should be using HttpsURLConnection, but on the other hand, it doesn't really make sense that we'd get a ClassNotFoundException for not using it, and also a major change like this would surely be documented. I've searched google and haven't been able to find anything related to this matter.

Thanks for your help!

Answer 1

尝试使用java.net.URLConnection作为导入。