google-http-java-client(android学习篇2源码)

package com.google.api.services.samples.googleplus.cmdline.simple;

import com.google.api.client.http.GenericUrl;

import com.google.api.client.http.HttpRequest;

import com.google.api.client.http.HttpRequestFactory;

import com.google.api.client.http.HttpRequestInitializer;

import com.google.api.client.http.HttpResponse;

import com.google.api.client.http.HttpResponseException;

import com.google.api.client.http.HttpTransport;

import com.google.api.client.http.javanet.NetHttpTransport;

import com.google.api.client.json.GenericJson;

import com.google.api.client.json.JsonFactory;

import com.google.api.client.json.JsonObjectParser;

import com.google.api.client.json.jackson2.JacksonFactory;

import com.google.api.client.util.Key;

import java.io.IOException;

import java.util.List;

/**

 * Simple example that demonstrates how to use <a

 * href="code.google.com/p/google-http-java-client/">Google HTTP Client Library for Java</a> with

 * the <a href="https://developers.google.com/+/api/">Google+ API</a>.

 *

 * <p>

 * Note that in the case of the Google+ API, there is a much better custom library built on top of

 * this HTTP library that is much easier to use and hides most of these details for you. See <a

 * href="http://code.google.com/p/google-api-java-client/wiki/APIs#Google+_API">Google+ API for

 * Java</a>.

 * </p>

 *

 * @author Yaniv Inbar

 */

publicclassGooglePlusSample{

  privatestaticfinalString API_KEY =

      "Enter API Key from https://code.google.com/apis/console/?api=plus into API_KEY";

  privatestaticfinalString USER_ID ="116899029375914044550";

  privatestaticfinalint MAX_RESULTS =3;

  staticfinalHttpTransport HTTP_TRANSPORT =newNetHttpTransport();

  staticfinalJsonFactory JSON_FACTORY =newJacksonFactory();

  /** Feed of Google+ activities. */

  publicstaticclassActivityFeed{

    /** List of Google+ activities. */

    @Key("items")

    privateList<Activity> activities;

    publicList<Activity> getActivities(){

      return activities;

    }

  }

  /** Google+ activity. */

  publicstaticclassActivityextendsGenericJson{

    /** Activity URL. */

    @Key

    privateString url;

    publicString getUrl(){

      return url;

    }

    /** Activity object. */

    @Key("object")

    privateActivityObject activityObject;

    publicActivityObject getActivityObject(){

      return activityObject;

    }

  }

  /** Google+ activity object. */

  publicstaticclassActivityObject{

    /** HTML-formatted content. */

    @Key

    privateString content;

    publicString getContent(){

      return content;

    }

    /** People who +1'd this activity. */

    @Key

    privatePlusOners plusoners;

    publicPlusOners getPlusOners(){

      return plusoners;

    }

  }

  /** People who +1'd an activity. */

  publicstaticclassPlusOners{

    /** Total number of people who +1'd this activity. */

    @Key

    privatelong totalItems;

    publiclong getTotalItems(){

      return totalItems;

    }

  }

  /** Google+ URL. */

  publicstaticclassPlusUrlextendsGenericUrl{

    publicPlusUrl(String encodedUrl){

      super(encodedUrl);

    }

    @SuppressWarnings("unused")

    @Key

    privatefinalString key = API_KEY;

    /** Maximum number of results. */

    @Key

    privateint maxResults;

    publicint getMaxResults(){

      return maxResults;

    }

    publicPlusUrl setMaxResults(int maxResults){

      this.maxResults = maxResults;

      returnthis;

    }

    /** Lists the public activities for the given Google+ user ID. */

    publicstaticPlusUrl listPublicActivities(String userId){

      returnnewPlusUrl(

          "https://www.googleapis.com/plus/v1/people/"+ userId +"/activities/public");

    }

  }

  privatestaticvoid parseResponse(HttpResponse response)throwsIOException{

    ActivityFeed feed = response.parseAs(ActivityFeed.class);

    if(feed.getActivities().isEmpty()){

      System.out.println("No activities found.");

    }else{

      if(feed.getActivities().size()== MAX_RESULTS){

        System.out.print("First ");

      }

      System.out.println(feed.getActivities().size()+" activities found:");

      for(Activity activity : feed.getActivities()){

        System.out.println();

        System.out.println("-----------------------------------------------");

        System.out.println("HTML Content: "+ activity.getActivityObject().getContent());

        System.out.println("+1's: "+ activity.getActivityObject().getPlusOners().getTotalItems());

        System.out.println("URL: "+ activity.getUrl());

        System.out.println("ID: "+ activity.get("id"));

      }

    }

  }

  privatestaticvoid run()throwsIOException{

    HttpRequestFactory requestFactory =

        HTTP_TRANSPORT.createRequestFactory(newHttpRequestInitializer(){

            @Override

          publicvoid initialize(HttpRequest request){

            request.setParser(newJsonObjectParser(JSON_FACTORY));

          }

        });

    PlusUrl url =PlusUrl.listPublicActivities(USER_ID).setMaxResults(MAX_RESULTS);

    url.put("fields","items(id,url,object(content,plusoners/totalItems))");

    HttpRequest request = requestFactory.buildGetRequest(url);

    parseResponse(request.execute());

  }

  publicstaticvoid main(String[] args){

    if(API_KEY.startsWith("Enter ")){

      System.err.println(API_KEY);

      System.exit(1);

    }

    try{

      try{

        run();

        return;

      }catch(HttpResponseException e){

        System.err.println(e.getMessage());

      }

    }catch(Throwable t){

      t.printStackTrace();

    }

    System.exit(1);

  }

}