如何在java中使用facebook登录验证用户 [英] How to authenticate users with facebook login in java

问题描述

您好我正在使用java进行网络项目我希望网站用户使用他们的Facebook帐户登录。我试过 Facebook开发官员

Hi i am working on a web project using java i want to user of website to log in using their Facebook account.I tried Facebook Developer official

但没有得到解决方案

推荐答案

我可以向您推荐OAuth库 Scribe ，或其改进的fork Subscribe 。如果您对使用示例感兴趣，请查看我的项目 OAuh JEE登录。

I can recommend you OAuth library Scribe, or its improved fork Subscribe. If you are interested in usage samples, take a look at my project OAuh JEE Login.

首先你需要获得OauthService实例：

First you need to get OauthService instance:

OAuthService service = new ServiceBuilder()
            .provider(FacebookApi.class)
            .apiKey("key").apiSecret("secret")
            .scope("email").callback("https://hostname/endpoint/")
            .build();

然后，您需要将用户重定向到Facebook页面，在那里他将授予对您的应用程序/登录的访问权限：

Then you need to redirect user to facebook page where he will grant access to your application / log in:

String redirectUrl = service.getAuthorizationUrl(NULL_TOKEN);
response.sendRedirect(redirectUrl);

Facebook将调用你的回调uri，你需要获取参数代码并获取访问令牌：

Facebook will then call your callback uri and you need to grab parameter code and get access token:

String verifierValue = request.getParameter("code");
if (verifierValue == null) {
    log.warn("Callback did not receive code parameter!");
    return false;
}

Verifier verifier = new Verifier(verifierValue);
Token accessToken = service.getAccessToken(NULL_TOKEN, verifier);

最后是时候使用此令牌向Facebook询问用户详情：

Finally it is time to use this token to ask Facebook for user details:

OAuthRequest resourceRequest = new OAuthRequest(Verb.GET, RESOURCE_URL);
service.signRequest(accessToken, resourceRequest);
Response resourceResponse = resourceRequest.send();

JsonObject jsonObject = JsonObject.readFrom(resourceResponse.getBody());
JsonValue value = jsonObject.get("username");

参见班级FacebookOAuthProcessor 。

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