使用 google gdata 客户端 API 从 Java/Scala 进行 OAuth2 授权

您将如何执行与“执行 OAuth 2.0”小节中的 Google .Net 示例 https://developers.google.com/google-apps/spreadsheets/，使用等效的 Java api？

我尝试使用 Java api 模仿的那个 .Net 示例似乎适合发送 api 请求来创建授权 url，然后假设我将在浏览器中使用该 url 来获取访问代码...从而允许服务器端代码此后，对于该谷歌帐户，使用谷歌电子表格 API。

我发现的最隐蔽的 Google Java api 类是OAuth助手 http://grepcode.com/file/repo1.maven.org/maven2/com.google.gdata/core/1.47.1/com/google/gdata/client/authn/oauth/OAuthHelper.java#OAuthHelper，但似乎需要userAuthorizationUrl在实例化时，这实际上是我希望通过它自己的方式从中获得的创建用户授权Url方法 https://developers.google.com/gdata/javadoc/com/google/gdata/client/authn/oauth/OAuthHelper#createUserAuthorizationUrl(com.google.gdata.client.authn.oauth.OAuthParameters) 在我成功实例化它之后- 对我来说有点循环难题。这似乎表明我在假设中遗漏了一些东西，可能这不是用于模仿 .Net 代码示例的正确类。

非常感谢您的帮助。

好像http://soatutorials.blogspot.co.at/2013/08/google-spreadsheet-api-connecting-with.html http://soatutorials.blogspot.co.at/2013/08/google-spreadsheet-api-connecting-with.html有Java版的。

Scala 解决方案代码，由http://javatoscala.com/ http://javatoscala.com/ :

package com.articlio.googleApi
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import com.google.gdata.client.GoogleService;
import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
import com.google.gdata.client.authn.oauth.OAuthException;
import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthRsaSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthSigner;
import com.google.gdata.client.spreadsheet.SpreadsheetService;
import com.google.gdata.data.spreadsheet.SpreadsheetFeed
import com.google.gdata.data.BaseEntry;
import com.google.gdata.data.BaseFeed;
import com.google.gdata.data.Feed;
import com.google.gdata.util.AuthenticationException;
import com.google.gdata.util.ServiceException;

//remove if not needed
import scala.collection.JavaConversions._

object OAuth2Sample {

  def loginOAuth2(clientID: String, clientSecret: String) {
    val SCOPES = "https://docs.google.com/feeds https://spreadsheets.google.com/feeds"
    val oauthParameters = new GoogleOAuthParameters
    oauthParameters.setOAuthConsumerKey(clientID) //
    var signer: OAuthSigner = null
    oauthParameters.setOAuthConsumerSecret(clientSecret) //
    signer = new OAuthHmacSha1Signer()
    val oauthHelper = new GoogleOAuthHelper(signer)
    oauthParameters.setScope(SCOPES)
    try {
      oauthHelper.getUnauthorizedRequestToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val requestUrl = oauthHelper.createUserAuthorizationUrl(oauthParameters)
    println(requestUrl)
    println("Please visit the URL above to authorize your OAuth " + 
      "request token.  Once that is complete, press any key to " + 
      "continue...")
    try {
      System.in.read()
    } catch {
      case e: IOException => e.printStackTrace()
    }
    var token: String = null
    try {
      token = oauthHelper.getAccessToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Access Token: " + token)
    println()
    var feedUrl: URL = null
    try {
      feedUrl = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full")
    } catch {
      case e: MalformedURLException => e.printStackTrace()
    }
    println("Sending request to " + feedUrl.toString)
    println()
    val googleService = new SpreadsheetService("oauth-sample-app")
    try {
      googleService.setOAuthCredentials(oauthParameters, signer)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    val feed = googleService.getFeed(feedUrl, classOf[SpreadsheetFeed])
    val spreadsheets = feed.getEntries
    println("Response Data:")
    println("=====================================================")
    if (spreadsheets != null) {
      for (spreadsheet <- spreadsheets) {
        println(spreadsheet.getTitle.getPlainText)
      }
    }
    println("=====================================================")
    println()
    println("Revoking OAuth Token...")
    try {
      oauthHelper.revokeToken(oauthParameters)
    } catch {
      case e: OAuthException => e.printStackTrace()
    }
    println("OAuth Token revoked...")
  }
}

然而，对于 scala，您目前还需要申请this https://stackoverflow.com/questions/27574210/scala-class-file-broken-error-when-using-java-jar/27574714#27574714...