如何使用Java客户端访问Google服务？ [英] How do you access Google service using a java client?

问题描述

我正在开发一个名为searcegadget2的Google应用程序，该应用程序在Google Apps Engine（GAE）上已注册。我已经使用OAuthHmacSha1Signer（）实施了三方OAuth 。我正在获取访问令牌 &将它存储在 Session （会话启用）。

下面，我使用链接onclick调用servlet事件。该servlet将使用accesstoken访问Spreadsheet服务。我的代码是：

  GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters（）; 
 oauthParameters.setOAuthConsumerKey（CONSUMER_KEY）; 
 oauthParameters.setOAuthConsumerSecret（CONSUMER_SECRET）; 
 oauthParameters.setOAuthType（OAuthParameters.OAuthType.THREE_LEGGED_OAUTH）; 
 oauthParameters.setScope（https://spreadsheets.google.com/feeds/）; 
 oauthParameters.setOAuthToken（request.getSession（）。getAttribute（oauth_token）。toString（））; 
 oauthParameters.setOAuthVerifier（request.getSession（）。getAttribute（oauth_verifier）。toString（））; 
 oauthParameters.setOAuthTokenSecret（request.getSession（）。getAttribute（oauth_token_secret）。toString（））; 
 
 
 
 out.println（访问服务）; 
 GoogleService googleService = new GoogleService（wise，searceapps-searcegadget2-1）; 
 out.println（< br />设置参数）; 
 googleService.setOAuthCredentials（oauthParameters，new OAuthHmacSha1Signer（））; 
 out.println（< br />设置URl）; 
网址feedUrl =新网址（https://spreadsheets.google.com/feeds/spreadsheets/private/full）; 
 out.println（< br /> Accessing ResultFeed）; 
 SpreadsheetFeed resultFeed = googleService.getFeed（feedUrl，SpreadsheetFeed.class）; 
 
 out.println（< div id ='feed'>）; 
 out.println（Response Data：）; 
 out.println（========================================= ============）; 
 out.println（| TITLE：+ resultFeed.getTitle（）。getPlainText（））; 
 if（resultFeed.getEntries（）。isEmpty（））{
 out.println（| \ tNo entries found。）; 
} else {
列表< SpreadsheetEntry> spreadsheets = resultFeed.getEntries（）; 
 for（int i = 0; i< spreadsheets.size（）; i ++）{
 SpreadsheetEntry entry = spreadsheets.get（i）; 
 System.out.println（\ t+ entry.getTitle（）。getPlainText（））; 
} 
} 
 out.println（=============================== ======================）; 
 out.println（< / div>）; 
  

我已经打印所有oauthParameter进行测试&他们正确设置。但是，在调用这个servlet时，我得到的唯一结果是：
$ b

访问服务

blockquote>

我添加了gdata-spreadsheet-3.0.jar，但它甚至不允许我创建服务对象！问题是什么？

此外，按照给出 here ，应用程序名称最好具有[company-id] - [app-name] - [app-version]的格式。名称将被Google服务器用来监控认证来源。我不知道我在哪里找到我的公司ID，但我的应用名称是searcegadget2&版本为1。

供参考： Google Spreadsheets API开发人员指南：Java ，使用Java客户端库， Google数据协议客户端中的OAuth图书馆

解决方案

最后发现，

Google服务依赖于：番石榴，因为它提到这里。

I am developing a java application which is registered on Google Apps Engine (GAE) with the name "searcegadget2". I have implemented 3-legged OAuth with OAuthHmacSha1Signer(). I am getting the Access Token properly & storing it on Session (session is enabled).

Next, I am calling the servlet using a link onclick event. This servlet is to access the Spreadsheet service using the accesstoken. My code is :

            GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
            oauthParameters.setOAuthConsumerKey(CONSUMER_KEY);
            oauthParameters.setOAuthConsumerSecret(CONSUMER_SECRET);
            oauthParameters.setOAuthType(OAuthParameters.OAuthType.THREE_LEGGED_OAUTH);
            oauthParameters.setScope("https://spreadsheets.google.com/feeds/");
            oauthParameters.setOAuthToken(request.getSession().getAttribute("oauth_token").toString());
            oauthParameters.setOAuthVerifier(request.getSession().getAttribute("oauth_verifier").toString());
            oauthParameters.setOAuthTokenSecret(request.getSession().getAttribute("oauth_token_secret").toString());



            out.println("Accessing Service");
            GoogleService googleService = new GoogleService("wise", "searceapps-searcegadget2-1");
            out.println("<br/>Setting Parameter");
            googleService.setOAuthCredentials(oauthParameters, new OAuthHmacSha1Signer());
            out.println("<br/>Setting URl");
            URL feedUrl = new URL("https://spreadsheets.google.com/feeds/spreadsheets/private/full");
            out.println("<br/>Accessing ResultFeed");
            SpreadsheetFeed resultFeed = googleService.getFeed(feedUrl, SpreadsheetFeed.class);

            out.println("<div id='feed'>");
            out.println("Response Data:");
            out.println("=====================================================");
            out.println("| TITLE: " + resultFeed.getTitle().getPlainText());
            if (resultFeed.getEntries().isEmpty()) {
                out.println("|\tNo entries found.");
            } else {
                List<SpreadsheetEntry> spreadsheets = resultFeed.getEntries();
                for (int i = 0; i < spreadsheets.size(); i++) {
                    SpreadsheetEntry entry = spreadsheets.get(i);
                    System.out.println("\t" + entry.getTitle().getPlainText());
                }
            }
            out.println("=====================================================");
            out.println("</div>");

I have printed all the oauthParameter for testing & they are properly set. But, while calling this servlet, the only output that I am getting is :

Accessing Service

I have added, gdata-spreadsheet-3.0.jar but still it is not even allowing me to create the service object !!! What is the problem ?

Also, as per it given here, "Application names should preferably have the format [company-id]-[app-name]-[app-version]. The name will be used by the Google servers to monitor the source of authentication." I don't know where I find my company id, but my app name is "searcegadget2" & version is "1".

For reference : Google Spreadsheets API Developer's Guide: Java, Using the Java Client Library, OAuth in the Google Data Protocol Client Libraries

解决方案

Finally found,

Google Service has dependency on : guava as it is mentioned here.

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