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);

}

}