Google API for Java是由Google开发的一个Java客户端类库，用于访问其提供的各种基于HTTP的服务。具有灵活、高效、强大等特点。这是访问基于REST或JSON-RPC的Google API推荐类库。

[代码] BigQuerySample.java

import com.google.api.client.googleapis.*;
import com.google.api.client.googleapis.auth.clientlogin.*;
import com.google.api.client.googleapis.json.*;
import com.google.api.client.http.*;
import java.io.*;

public class BigQuerySample {
public static void main(String[] args) throws IOException {
HttpTransport transport = GoogleTransport.create();
transport.addParser(new JsonCParser());
try {
// authenticate with ClientLogin
ClientLogin authenticator = new ClientLogin();
authenticator.authTokenType = "ndev";
authenticator.username = "...";
authenticator.password = "...";
authenticator.authenticate().setAuthorizationHeader(transport);
// make query request
HttpRequest request = transport.buildGetRequest();
request.setUrl("https://www.googleapis.com/bigquery/v1/query");
request.url.put(
"q", "select count(*) from [bigquery/samples/shakespeare];");
System.out.println(request.execute().parseAsString());
} catch (HttpResponseException e) {
System.err.println(e.response.parseAsString());
throw e;
}
}
}

[代码] YouTubeSample.java

import com.google.api.client.googleapis.json.*;
import com.google.api.client.http.*;
import com.google.api.client.util.*;
import java.io.*;
import java.util.*;

public class YouTubeSample {

public static class VideoFeed {
@Key List

public static class Video {
@Key String title;
@Key String description;
@Key Player player;
}

public static class Player {
@Key("default") String defaultUrl;
}

public static class YouTubeUrl extends GenericUrl {
@Key final String alt = "jsonc";
@Key String author;
@Key("max-results") Integer maxResults;

YouTubeUrl(String url) { super(url); }
}

public static void main(String[] args) throws IOException {
// setup up the HTTP transport
HttpTransport transport = new HttpTransport();
transport.defaultHeaders.put("GData-Version", "2");
transport.addParser(new JsonCParser());
// build the HTTP GET request and URL
HttpRequest request = transport.buildGetRequest();
YouTubeUrl url = new YouTubeUrl("https://gdata.youtube.com/feeds/api/videos");
url.author = "searchstories";
url.maxResults = 2;
request.url = url;
// execute the request and the parse video feed
VideoFeed feed = request.execute().parseAs(VideoFeed.class);
for (Video video : feed.items) {
System.out.println();
System.out.println("Video title: " + video.title);
System.out.println("Description: " + video.description);
System.out.println("Play URL: " + video.player.defaultUrl);
}
}
}

public final class PicasaAndroidSample extends ListActivity {
...

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
gotAccount(false);
}