shin1ogawa/GDataCalendarExample.java

## GDataCalendarExample.java
import java.io.*;
import java.net.*;

public class GDataCalendarExample {

  static final String CLIENT_ID = "";
  static final String CLIENT_SECRET = "";
  static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication
  static final String SCOPES = "https://www.googleapis.com/auth/calendar";
  static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

  /**
   * @param args
   * @throws IOException
   */
  public static void main(String[] args) throws IOException {
    // autherization codeを取得するためのURLを組み立てる
    String authorizationCode = retrieveAuthorizationCode();

    // autherization codeを使ってaccess tokenとrefresh tokenを取得する
    String tokens = retrieveTokens(authorizationCode);

    System.out.println(tokens);

    int start = tokens.indexOf("\"access_token\" : \"")
        + "\"access_token\" : \"".length();
    int end = tokens.indexOf("\"", start);
    String accessToken = tokens.substring(start, end);

    // Calendar APIを使ってみる。
    listCalendarList(accessToken);

    System.out.println("カレンダーIDを入力して下しあ：");
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        System.in));
    String calendarId = reader.readLine();

    listEvents(accessToken, calendarId);

    System.out.println("予定のタイトルを入力してください：");
    String eventTitle = reader.readLine();

    postEvents(accessToken, calendarId, eventTitle);
  }

  static void postEvents(String accessToken, String calendarId,
      String eventTitle) throws IOException {

    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("{");
    b.append("\"start\": { \"date\": \"2012-02-28\" },");
    b.append("\"end\": { \"date\": \"2012-02-28\" },");
    b.append("\"summary\": \"").append(eventTitle).append("\"");
    b.append("}");
    System.out.println(b);
    byte[] payload = b.toString().getBytes("utf-8");

    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.googleapis.com/calendar/v3/calendars/"
            + calendarId + "/events").openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Authorization", "OAuth " + accessToken);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.setRequestProperty("Content-Type", "application/json; charset=utf-8");
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    try {
      BufferedReader reader = new BufferedReader(new InputStreamReader(
          c.getInputStream()));
      String line = null;
      while ((line = reader.readLine()) != null) {
        System.out.println(line);
      }
    } catch (IOException e) {
      System.out.println(c.getResponseCode());
      System.out.println(c.getResponseMessage());
    }
  }

  static void listEvents(String accessToken, String calendarId)
      throws IOException {
    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.googleapis.com/calendar/v3/calendars/"
            + calendarId + "/events").openConnection();
    c.setRequestProperty("Authorization", "OAuth " + accessToken);

    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      System.out.println(line);
    }
  }

  static void listCalendarList(String accessToken) throws IOException {
    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.googleapis.com/calendar/v3/users/me/calendarList")
        .openConnection();
    c.setRequestProperty("Authorization", "OAuth " + accessToken);
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      System.out.println(line);
    }
  }

  /**
   * @param refreshToken
   * @return リフレッシュトークンを使ったアクセストークン取得のレスポンス
   *         <code>{ "access_token": access_token, ...}</code>
   * @throws IOException
   */
  static String refreshToken(String refreshToken) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&client_secret=").append(
        URLEncoder.encode(CLIENT_SECRET, "utf-8"));
    b.append("&refresh_token=").append(
        URLEncoder.encode(refreshToken, "utf-8"));
    b.append("&grant_type=refresh_token");
    byte[] payload = b.toString().getBytes();

    // POST メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    // トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
    StringBuilder json = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      json.append(line).append("\n");
    }
    return json.toString();
  }

  static String retrieveTokens(String authorizationCode) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&client_secret=").append(
        URLEncoder.encode(CLIENT_SECRET, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&grant_type=authorization_code");
    byte[] payload = b.toString().getBytes();

    // POST メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    // トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
    StringBuilder json = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      json.append(line).append("\n");
    }
    return json.toString();
  }

  static String retrieveAuthorizationCode() throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("response_type=code");
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
    b.append("&state=dummy");

    HttpURLConnection.setFollowRedirects(false);
    // GET メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
        + b.toString()).openConnection();
    System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
    System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
    // ブラウザに表示されたauthorization codeを標準入力から入力させる。
    // // 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
    // // <title>Success state=dummy&amp;code=XXXXXXX</title>
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        System.in));
    return reader.readLine();
  }
}

## GDataContactsExample.java
import java.io.*;
import java.net.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;

public class GDataContactsExample {

  static final String CLIENT_ID = "";
  static final String CLIENT_SECRET = "";
  static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication
  static final String SCOPES = "https://www.google.com/m8/feeds";
  static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

  /**
   * @param args
   * @throws IOException
   * @throws ParserConfigurationException
   * @throws SAXException
   */
  public static void main(String[] args) throws IOException, SAXException,
      ParserConfigurationException {
    // autherization codeを取得するためのURLを組み立てる
    String authorizationCode = retrieveAuthorizationCode();

    // autherization codeを使ってaccess tokenとrefresh tokenを取得する
    String tokens = retrieveTokens(authorizationCode);

    System.out.println(tokens);

    int start = tokens.indexOf("\"access_token\" : \"")
        + "\"access_token\" : \"".length();
    int end = tokens.indexOf("\"", start);
    String accessToken = tokens.substring(start, end);
    // String accessToken =
    // "ya29.AHES6ZRwaS3PnSh5XMC_4VU3gYez0U6dIyb8CNJ7O9_Zu1VvAsdmem0";

    // Contacts APIを使ってみる: 連絡先の一覧を取得する
    listContacts(accessToken);

    // Contacts APIを使ってみる: 連絡先を追加する
    createContact(accessToken);
  }

  static void createContact(String accessToken) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("<?xml version='1.0' encoding='UTF-8'?>\n");
    b.append("<entry xmlns='http://www.w3.org/2005/Atom' xmlns:gContact='http://schemas.google.com/contact/2008' xmlns:batch='http://schemas.google.com/gdata/batch' xmlns:gd='http://schemas.google.com/g/2005'>");
    b.append(" <category scheme='http://schemas.google.com/g/2005#kind' term='http://schemas.google.com/contact/2008#contact' />");
    b.append(" <gd:name>");
    b.append("  <gd:givenName>AppsAPIJA</gd:givenName>");
    b.append("  <gd:familyName>Third</gd:familyName>");
    b.append("  <gd:fullName>AppsAPIJA #3</gd:fullName>");
    b.append(" </gd:name>");
    b.append(" <gd:email rel='http://schemas.google.com/g/2005#other' address='appsapija@example.com' primary='true'/>");
    b.append(" <title>AppsAPIJA #3</title>");
    b.append("</entry>");
    System.out.println(b);
    byte[] payload = b.toString().getBytes("utf-8");

    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.google.com/m8/feeds/contacts/default/full")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Authorization", "OAuth " + accessToken);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.setRequestProperty("Content-Type",
        "application/atom+xml; charset=UTF-8;");
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    System.out.println(c.getResponseCode() + ":" + c.getResponseMessage());
  }

  static void listContacts(String accessToken) throws IOException,
      SAXException, ParserConfigurationException {
    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.google.com/m8/feeds/contacts/default/full")
        .openConnection();
    c.setRequestProperty("Authorization", "OAuth " + accessToken);
    Document root = DocumentBuilderFactory.newInstance()
        .newDocumentBuilder().parse(c.getInputStream());

    // /entry
    NodeList entryList = root.getElementsByTagName("entry");
    for (int i = 0, len = entryList.getLength(); i < len; i++) {
      Node entryNode = entryList.item(i);
      NodeList childrenOfEntryNode = entryNode.getChildNodes();
      for (int j = 0, lenJ = entryList.getLength(); j < lenJ; j++) {
        Node childOfEntryNode = childrenOfEntryNode.item(j);
        if (childOfEntryNode == null
            || childOfEntryNode.getNodeType() != Node.ELEMENT_NODE) {
          continue;
        }
        if ("gd:email".equals(childOfEntryNode.getNodeName())) {
          System.out.println(childOfEntryNode.getAttributes()
              .getNamedItem("address"));
        }
      }
    }
  }

  /**
   * @param refreshToken
   * @return リフレッシュトークンを使ったアクセストークン取得のレスポンス
   *         <code>{ "access_token": access_token, ...}</code>
   * @throws IOException
   */
  static String refreshToken(String refreshToken) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&client_secret=").append(
        URLEncoder.encode(CLIENT_SECRET, "utf-8"));
    b.append("&refresh_token=").append(
        URLEncoder.encode(refreshToken, "utf-8"));
    b.append("&grant_type=refresh_token");
    byte[] payload = b.toString().getBytes();

    // POST メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    // トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
    StringBuilder json = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      json.append(line).append("\n");
    }
    return json.toString();
  }

  static String retrieveTokens(String authorizationCode) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&client_secret=").append(
        URLEncoder.encode(CLIENT_SECRET, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&grant_type=authorization_code");
    byte[] payload = b.toString().getBytes();

    // POST メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    // トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
    StringBuilder json = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      json.append(line).append("\n");
    }
    return json.toString();
  }

  static String retrieveAuthorizationCode() throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("response_type=code");
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
    b.append("&state=dummy");

    HttpURLConnection.setFollowRedirects(false);
    // GET メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
        + b.toString()).openConnection();
    System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
    System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
    // ブラウザに表示されたauthorization codeを標準入力から入力させる。
    // // 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
    // // <title>Success state=dummy&amp;code=XXXXXXX</title>
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        System.in));
    return reader.readLine();
  }
}

## GDataOAuth2Example.java
import java.io.*;
import java.net.*;

public class GDataOAuth2Example {

  static final String CLIENT_ID = "";
  static final String CLIENT_SECRET = "";
  static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication

  static final String SCOPES = "https://www.googleapis.com/auth/userinfo.profile"
      + " https://www.googleapis.com/auth/userinfo.email";
  static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

  /**
   * @param args
   * @throws IOException
   */
  public static void main(String[] args) throws IOException {
    // autherization codeを取得するためのURLを組み立てる
    String authorizationCode = retrieveAuthorizationCode();

    // autherization codeを使ってaccess tokenとrefresh tokenを取得する
    String tokens = retrieveTokens(authorizationCode);

    System.out.println(tokens);

    int start = tokens.indexOf("\"access_token\" : \"")
        + "\"access_token\" : \"".length();
    int end = tokens.indexOf("\"", start);
    String accessToken = tokens.substring(start, end);

    // user info APIを使ってみる。
    HttpURLConnection c = (HttpURLConnection) new URL(
        "https://www.googleapis.com/oauth2/v2/userinfo")
        .openConnection();
    // access tokenを Authorization Headerに指定するだけ！
    c.setRequestProperty("Authorization", "OAuth " + accessToken);

    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      System.out.println(line);
    }
  }

  static String retrieveTokens(String authorizationCode) throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&client_secret=").append(
        URLEncoder.encode(CLIENT_SECRET, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&grant_type=authorization_code");
    byte[] payload = b.toString().getBytes();

    // POST メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
        .openConnection();
    c.setRequestMethod("POST");
    c.setDoOutput(true);
    c.setRequestProperty("Content-Length", String.valueOf(payload.length));
    c.getOutputStream().write(payload);
    c.getOutputStream().flush();

    // トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
    StringBuilder json = new StringBuilder();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        c.getInputStream()));
    String line = null;
    while ((line = reader.readLine()) != null) {
      json.append(line).append("\n");
    }
    return json.toString();
  }

  static String retrieveAuthorizationCode() throws IOException {
    // パラメータを組み立てる
    StringBuilder b = new StringBuilder();
    b.append("response_type=code");
    b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
    b.append("&redirect_uri=").append(
        URLEncoder.encode(REDIRECT_URI, "utf-8"));
    b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
    b.append("&state=dummy");

    HttpURLConnection.setFollowRedirects(false);
    // GET メソッドでリクエストする
    HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
        + b.toString()).openConnection();
    System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
    System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
    // ブラウザに表示されたauthorization codeを標準入力から入力させる。
    //// 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
    //// <title>Success state=dummy&amp;code=XXXXXXX</title>
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        System.in));
    return reader.readLine();
  }
}
	import java.io.*;
	import java.net.*;

	public class GDataCalendarExample {

	static final String CLIENT_ID = "";
	static final String CLIENT_SECRET = "";
	static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication
	static final String SCOPES = "https://www.googleapis.com/auth/calendar";
	static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

	/**
	* @param args
	* @throws IOException
	*/
	public static void main(String[] args) throws IOException {
	// autherization codeを取得するためのURLを組み立てる
	String authorizationCode = retrieveAuthorizationCode();

	// autherization codeを使ってaccess tokenとrefresh tokenを取得する
	String tokens = retrieveTokens(authorizationCode);

	System.out.println(tokens);

	int start = tokens.indexOf("\"access_token\" : \"")
	+ "\"access_token\" : \"".length();
	int end = tokens.indexOf("\"", start);
	String accessToken = tokens.substring(start, end);

	// Calendar APIを使ってみる。
	listCalendarList(accessToken);

	System.out.println("カレンダーIDを入力して下しあ：");
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	System.in));
	String calendarId = reader.readLine();

	listEvents(accessToken, calendarId);

	System.out.println("予定のタイトルを入力してください：");
	String eventTitle = reader.readLine();

	postEvents(accessToken, calendarId, eventTitle);
	}

	static void postEvents(String accessToken, String calendarId,
	String eventTitle) throws IOException {

	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("{");
	b.append("\"start\": { \"date\": \"2012-02-28\" },");
	b.append("\"end\": { \"date\": \"2012-02-28\" },");
	b.append("\"summary\": \"").append(eventTitle).append("\"");
	b.append("}");
	System.out.println(b);
	byte[] payload = b.toString().getBytes("utf-8");

	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.googleapis.com/calendar/v3/calendars/"
	+ calendarId + "/events").openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Authorization", "OAuth " + accessToken);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.setRequestProperty("Content-Type", "application/json; charset=utf-8");
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	try {
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	System.out.println(line);
	}
	} catch (IOException e) {
	System.out.println(c.getResponseCode());
	System.out.println(c.getResponseMessage());
	}
	}

	static void listEvents(String accessToken, String calendarId)
	throws IOException {
	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.googleapis.com/calendar/v3/calendars/"
	+ calendarId + "/events").openConnection();
	c.setRequestProperty("Authorization", "OAuth " + accessToken);

	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	System.out.println(line);
	}
	}

	static void listCalendarList(String accessToken) throws IOException {
	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.googleapis.com/calendar/v3/users/me/calendarList")
	.openConnection();
	c.setRequestProperty("Authorization", "OAuth " + accessToken);
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	System.out.println(line);
	}
	}

	/**
	* @param refreshToken
	* @return リフレッシュトークンを使ったアクセストークン取得のレスポンス
	* <code>{ "access_token": access_token, ...}</code>
	* @throws IOException
	*/
	static String refreshToken(String refreshToken) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&client_secret=").append(
	URLEncoder.encode(CLIENT_SECRET, "utf-8"));
	b.append("&refresh_token=").append(
	URLEncoder.encode(refreshToken, "utf-8"));
	b.append("&grant_type=refresh_token");
	byte[] payload = b.toString().getBytes();

	// POST メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	// トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
	StringBuilder json = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	json.append(line).append("\n");
	}
	return json.toString();
	}

	static String retrieveTokens(String authorizationCode) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&client_secret=").append(
	URLEncoder.encode(CLIENT_SECRET, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&grant_type=authorization_code");
	byte[] payload = b.toString().getBytes();

	// POST メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	// トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
	StringBuilder json = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	json.append(line).append("\n");
	}
	return json.toString();
	}

	static String retrieveAuthorizationCode() throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("response_type=code");
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
	b.append("&state=dummy");

	HttpURLConnection.setFollowRedirects(false);
	// GET メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
	+ b.toString()).openConnection();
	System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
	System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
	// ブラウザに表示されたauthorization codeを標準入力から入力させる。
	// // 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
	// // <title>Success state=dummy&code=XXXXXXX</title>
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	System.in));
	return reader.readLine();
	}
	}
	import java.io.*;
	import java.net.*;
	import javax.xml.parsers.*;
	import org.w3c.dom.*;
	import org.xml.sax.*;

	public class GDataContactsExample {

	static final String CLIENT_ID = "";
	static final String CLIENT_SECRET = "";
	static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication
	static final String SCOPES = "https://www.google.com/m8/feeds";
	static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

	/**
	* @param args
	* @throws IOException
	* @throws ParserConfigurationException
	* @throws SAXException
	*/
	public static void main(String[] args) throws IOException, SAXException,
	ParserConfigurationException {
	// autherization codeを取得するためのURLを組み立てる
	String authorizationCode = retrieveAuthorizationCode();

	// autherization codeを使ってaccess tokenとrefresh tokenを取得する
	String tokens = retrieveTokens(authorizationCode);

	System.out.println(tokens);

	int start = tokens.indexOf("\"access_token\" : \"")
	+ "\"access_token\" : \"".length();
	int end = tokens.indexOf("\"", start);
	String accessToken = tokens.substring(start, end);
	// String accessToken =
	// "ya29.AHES6ZRwaS3PnSh5XMC_4VU3gYez0U6dIyb8CNJ7O9_Zu1VvAsdmem0";

	// Contacts APIを使ってみる: 連絡先の一覧を取得する
	listContacts(accessToken);

	// Contacts APIを使ってみる: 連絡先を追加する
	createContact(accessToken);
	}

	static void createContact(String accessToken) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("<?xml version='1.0' encoding='UTF-8'?>\n");
	b.append("<entry xmlns='http://www.w3.org/2005/Atom' xmlns:gContact='http://schemas.google.com/contact/2008' xmlns:batch='http://schemas.google.com/gdata/batch' xmlns:gd='http://schemas.google.com/g/2005'>");
	b.append(" <category scheme='http://schemas.google.com/g/2005#kind' term='http://schemas.google.com/contact/2008#contact' />");
	b.append(" <gd:name>");
	b.append(" <gd:givenName>AppsAPIJA</gd:givenName>");
	b.append(" <gd:familyName>Third</gd:familyName>");
	b.append(" <gd:fullName>AppsAPIJA #3</gd:fullName>");
	b.append(" </gd:name>");
	b.append(" <gd:email rel='http://schemas.google.com/g/2005#other' address='appsapija@example.com' primary='true'/>");
	b.append(" <title>AppsAPIJA #3</title>");
	b.append("</entry>");
	System.out.println(b);
	byte[] payload = b.toString().getBytes("utf-8");

	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.google.com/m8/feeds/contacts/default/full")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Authorization", "OAuth " + accessToken);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.setRequestProperty("Content-Type",
	"application/atom+xml; charset=UTF-8;");
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	System.out.println(c.getResponseCode() + ":" + c.getResponseMessage());
	}

	static void listContacts(String accessToken) throws IOException,
	SAXException, ParserConfigurationException {
	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.google.com/m8/feeds/contacts/default/full")
	.openConnection();
	c.setRequestProperty("Authorization", "OAuth " + accessToken);
	Document root = DocumentBuilderFactory.newInstance()
	.newDocumentBuilder().parse(c.getInputStream());

	// /entry
	NodeList entryList = root.getElementsByTagName("entry");
	for (int i = 0, len = entryList.getLength(); i < len; i++) {
	Node entryNode = entryList.item(i);
	NodeList childrenOfEntryNode = entryNode.getChildNodes();
	for (int j = 0, lenJ = entryList.getLength(); j < lenJ; j++) {
	Node childOfEntryNode = childrenOfEntryNode.item(j);
	if (childOfEntryNode == null
	\|\| childOfEntryNode.getNodeType() != Node.ELEMENT_NODE) {
	continue;
	}
	if ("gd:email".equals(childOfEntryNode.getNodeName())) {
	System.out.println(childOfEntryNode.getAttributes()
	.getNamedItem("address"));
	}
	}
	}
	}

	/**
	* @param refreshToken
	* @return リフレッシュトークンを使ったアクセストークン取得のレスポンス
	* <code>{ "access_token": access_token, ...}</code>
	* @throws IOException
	*/
	static String refreshToken(String refreshToken) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&client_secret=").append(
	URLEncoder.encode(CLIENT_SECRET, "utf-8"));
	b.append("&refresh_token=").append(
	URLEncoder.encode(refreshToken, "utf-8"));
	b.append("&grant_type=refresh_token");
	byte[] payload = b.toString().getBytes();

	// POST メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	// トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
	StringBuilder json = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	json.append(line).append("\n");
	}
	return json.toString();
	}

	static String retrieveTokens(String authorizationCode) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&client_secret=").append(
	URLEncoder.encode(CLIENT_SECRET, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&grant_type=authorization_code");
	byte[] payload = b.toString().getBytes();

	// POST メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	// トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
	StringBuilder json = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	json.append(line).append("\n");
	}
	return json.toString();
	}

	static String retrieveAuthorizationCode() throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("response_type=code");
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
	b.append("&state=dummy");

	HttpURLConnection.setFollowRedirects(false);
	// GET メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
	+ b.toString()).openConnection();
	System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
	System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
	// ブラウザに表示されたauthorization codeを標準入力から入力させる。
	// // 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
	// // <title>Success state=dummy&code=XXXXXXX</title>
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	System.in));
	return reader.readLine();
	}
	}
	import java.io.*;
	import java.net.*;

	public class GDataOAuth2Example {

	static final String CLIENT_ID = "";
	static final String CLIENT_SECRET = "";
	static final String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // InstalledApplication

	static final String SCOPES = "https://www.googleapis.com/auth/userinfo.profile"
	+ " https://www.googleapis.com/auth/userinfo.email";
	static final String ENDPOINT = "https://accounts.google.com/o/oauth2";

	/**
	* @param args
	* @throws IOException
	*/
	public static void main(String[] args) throws IOException {
	// autherization codeを取得するためのURLを組み立てる
	String authorizationCode = retrieveAuthorizationCode();

	// autherization codeを使ってaccess tokenとrefresh tokenを取得する
	String tokens = retrieveTokens(authorizationCode);

	System.out.println(tokens);

	int start = tokens.indexOf("\"access_token\" : \"")
	+ "\"access_token\" : \"".length();
	int end = tokens.indexOf("\"", start);
	String accessToken = tokens.substring(start, end);

	// user info APIを使ってみる。
	HttpURLConnection c = (HttpURLConnection) new URL(
	"https://www.googleapis.com/oauth2/v2/userinfo")
	.openConnection();
	// access tokenを Authorization Headerに指定するだけ！
	c.setRequestProperty("Authorization", "OAuth " + accessToken);

	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	System.out.println(line);
	}
	}

	static String retrieveTokens(String authorizationCode) throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("code=").append(URLEncoder.encode(authorizationCode, "utf-8"));
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&client_secret=").append(
	URLEncoder.encode(CLIENT_SECRET, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&grant_type=authorization_code");
	byte[] payload = b.toString().getBytes();

	// POST メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/token")
	.openConnection();
	c.setRequestMethod("POST");
	c.setDoOutput(true);
	c.setRequestProperty("Content-Length", String.valueOf(payload.length));
	c.getOutputStream().write(payload);
	c.getOutputStream().flush();

	// トークン類が入ったレスポンスボディの内容を返す(JSONで返される)
	StringBuilder json = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	c.getInputStream()));
	String line = null;
	while ((line = reader.readLine()) != null) {
	json.append(line).append("\n");
	}
	return json.toString();
	}

	static String retrieveAuthorizationCode() throws IOException {
	// パラメータを組み立てる
	StringBuilder b = new StringBuilder();
	b.append("response_type=code");
	b.append("&client_id=").append(URLEncoder.encode(CLIENT_ID, "utf-8"));
	b.append("&redirect_uri=").append(
	URLEncoder.encode(REDIRECT_URI, "utf-8"));
	b.append("&scope=").append(URLEncoder.encode(SCOPES, "utf-8"));
	b.append("&state=dummy");

	HttpURLConnection.setFollowRedirects(false);
	// GET メソッドでリクエストする
	HttpURLConnection c = (HttpURLConnection) new URL(ENDPOINT + "/auth?"
	+ b.toString()).openConnection();
	System.out.println("下記URLを開いて、アクセス承認後に表示された文字列を入力してください。");
	System.out.println(c.getHeaderField("Location")); // Locationヘッダに、承認用URLが設定される
	// ブラウザに表示されたauthorization codeを標準入力から入力させる。
	//// 返却されたHTMLのタイトルにもauthorization codeが設定されているので、自動的に取得することもできる。
	//// <title>Success state=dummy&code=XXXXXXX</title>
	BufferedReader reader = new BufferedReader(new InputStreamReader(
	System.in));
	return reader.readLine();
	}
	}