从谷歌的oauth2联系人API获取用户信息(Get Userinfo from Oauth2 Go

其中我得到错误：

com.google.api.client.googleapis.json.GoogleJsonResponseException: 401 Unauthorized
{
  "code" : 401,
  "errors" : [ {
    "domain" : "global",
    "location" : "Authorization",
    "locationType" : "header",
    "message" : "Invalid Credentials",
    "reason" : "authError"
  } ],
  "message" : "Invalid Credentials"
}

下面的代码，我使用：

GoogleCredential credential = new GoogleCredential.Builder()
    .setTransport(this.TRANSPORT).setJsonFactory(this.JSON_FACTORY)
    .setClientSecrets(Constants.CLIENT_ID, Constants.CLIENT_SECRET).build();
credential.setAccessToken(tokenResponse.getAccessToken());
credential.setAccessToken(tokenResponse.getRefreshToken());

到这里，我得到刷新令牌，访问令牌等

Oauth2 userInfoService = new Oauth2.Builder(this.TRANSPORT,
        this.JSON_FACTORY, credential.getRequestInitializer())
        .setApplicationName(Constants.APPLICATION_NAME).build();

它无法以低于行：（不知道，为什么呢？）

Userinfo userInfo = userInfoService.userinfo().get().execute();

我搜索的网页，和我得到的非常少的例子和稀有材料。任何身体上有什么想法？

我究竟做错了什么？

Answer 1:

我猜credential.getRequestInitializer（）为null。

我由一个自定义的请求初始化设置这样的凭证对象解决了这个

GoogleCredential credential = new GoogleCredential.Builder()
.setTransport(this.TRANSPORT).setJsonFactory(this.JSON_FACTORY)
.setClientSecrets(Constants.CLIENT_ID, Constants.CLIENT_SECRET).setRequestInitializer((new HttpRequestInitializer(){
                @Override
                public void initialize(HttpRequest request)
                        throws IOException {
                    request.getHeaders().put("Authorization", "Bearer " + accessToken);
                }
            })).build()

谷歌的文档 especifies如下：

**例如，使用查询的access_token字符串参数到用户信息API的调用如下所示：

GET https://www.googleapis.com/oauth2/v1/userinfo?access_token= {的accessToken}使用访问令牌在HTTP头看起来如下到同一API的调用：

GET /的oauth2 / V1 / userinfo的HTTP / 1.1授权：承载{的accessToken}主机：googleapis.com **

希望对你有帮助

Answer 2:

如果您已经获得访问令牌（ GoogleTokenResponse ），那么你也可以这样做：

HttpTransport transport = new NetHttpTransport();

List<String> applicationScopes = Arrays.asList(
  PlusScopes.USERINFO_EMAIL,
  PlusScopes.USERINFO_PROFILE
);

GoogleAuthorizationCodeFlow flow
  = new GoogleAuthorizationCodeFlow.Builder(
    transport,
    JacksonFactory.getDefaultInstance(),
    "your-client-id.apps.googleusercontent.com",
    "your-client-secret",
    applicationScopes).build();

String userId = googleTokenResponse.parseIdToken().getPayload().getSubject();
Credential credential = flow.createAndStoreCredential(googleTokenResponse, userId);
HttpRequestFactory requestFactory = transport.createRequestFactory(credential);

GenericUrl url = new GenericUrl("https://www.googleapis.com/oauth2/v1/userinfo");
HttpRequest request = requestFactory.buildGetRequest(url);
String userIdentity = request.execute().parseAsString();

该userIdentity则是这样的：

{
  "id": "105358994046791627189",
  "name": "Benny Neugebauer",
  "given_name": "Benny",
  "family_name": "Neugebauer",
  "link": "https://plus.google.com/+BennyNeugebauer",
  "picture": "https://lh4.googleusercontent.com/-dtvDIXCEtFc/AAAAAAAAAAI/AAAAAAAAAoE/1CKd3nH9rRo/photo.jpg",
  "gender": "male",
  "locale": "de"
}

如果你愿意，你可以解析userIdentity使用杰克逊到自己的类：

ObjectMapper mapper = new org.codehaus.jackson.map.ObjectMapper();
mapper.readValue(userIdentity, YourUser.class);

下面是我用这个例子的依赖关系：

<dependency>
  <groupId>com.google.apis</groupId>
  <artifactId>google-api-services-plus</artifactId>
  <version>v1-rev401-1.22.0</version>
</dependency>

<dependency>
  <groupId>org.codehaus.jackson</groupId>
  <artifactId>jackson-mapper-asl</artifactId>
  <version>1.9.13</version>
  <type>jar</type>
</dependency>