web版facebook登录

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项目结构图：



流程图：


facebook返回的数据：

/*从facebook返回的个人json数据，为了更方便看使用js文件格式化了一下*/
var info = {
	"location" : {
		"id" : "197604863587708",
		"name" : "四川成都"
	},
	"locale" : "en_US",
	"link" : "http://www.facebook.com/couplecross",
	"sports" : [ {
		"id" : "108614982500363",
		"name" : "Basketball"
	} ],
	"education" : [ {
		"school" : {
			"id" : "110480755647045",
			"name" : "**中学"
		},
		"type" : "High School"
	}, {
		"concentration" : [ {
			"id" : "107712559258737",
			"name" : "软件工程"
		} ],
		"school" : {
			"id" : "109354635749672",
			"name" : "**大学"
		},
		"type" : "College"
	} ],
	"updated_time" : "2012-02-14T09:27:55+0000",
	"id" : "100002906766192",
	"first_name" : "张",
	"username" : "couplecross",
	"timezone" : 8,
	"bio" : "性格诡异，长相抽象；勤于思考，喜欢小创意！",
	"email" : "[email protected]",
	"verified" : true,
	"name" : "张三",
	"last_name" : "三",
	"gender" : "male"
}

FacebookLoginFilter.java

package com.hydom.filter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONException;
import org.json.JSONObject;

import com.hydom.entity.User;
import com.visural.common.IOUtil;

/**
 * 功能： 

 * 1.方法的代码顺序就代表了执行过程；

 * 2.每一个方法代表了一个执行步骤；

 * 3.每一个方法的注释就说明了这个方法的功能点；

 * 4.方法彼此相互关联:下一个方法依靠上一个方法的执行结果；

 * 
 * @author [email protected]

 * @date 2012-2-23

 * @version 1.0 

 * 
 */
public class FacebookLoginFilter extends BaseFilter {

	private String app_id;
	private String secret;
	private String app_url;

	private static final Log log = LogFactory.getLog(FacebookLoginFilter.class);

	User user;

	/**
	 * 系統初始化的時候就賦值這三個參數

	 * 当然这三个参数是可以通过配置文件来做，为了简便就直接赋值了
	 */
	@Override
	public void init(FilterConfig arg0) {
		app_id = "323109261075221";
		secret = "796684bfbb7594a6c599d12046c492a6";
		app_url = "http://192.168.0.27:8080/facebookLogin";
	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {

		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;

		HttpSession session = request.getSession(true);
		session.setMaxInactiveInterval(-1);
		session.setAttribute("appId", app_id);
		session.setAttribute("secret", secret);
		session.setAttribute("appUrl", app_url);

		String code = request.getParameter("code");
		if (null != code) {

			String accessToken = (String) session.getAttribute("accessToken");
			Integer expires = (Integer) session.getAttribute("expires");

			//accessToken这值session没有才进行获取授权
			if ((null == accessToken || "".equals(accessToken.trim()))
					|| null == expires) {
				/**
				 * 示例readURL返回结果，说明为什么要这样写下面的代码:

				 * result:

				 * access_token=
				 * AAAD3oVisZAtEBAHWN886RlkMkaYlS85Xpg50M6QvZAZAgaa

				 * Pc1fmA322LEefPnzYb47plXgIQBccTsqE7R64uiw
				 * DMNvT0rhAOtuCPKXAl8o7LeNSjeT

				 * &expires=5558
				 */
				URL authUrl = getAuthUrlByCode(code);
				String result = getAccessTokenByAuthUrl(authUrl);
				log.info("facebook登录的时候读取授权URL后的返回内容：\n" + result);

				String[] pairs = result.split("&");
				String[] keyValue;
				for (String pair : pairs) {
					
					keyValue = pair.split("=");
					
					if (keyValue.length != 2) {
						log.error("facebook访问授权URL获取keyValue对出错,原因：\n",
								new RuntimeException("Unexpected auth response"));
					} else {
						
						//获取accessToken
						if (keyValue[0].equals("access_token")) {
							accessToken = keyValue[1];
							if (accessToken != null) {
								//将accessToken放入session，避免重复获取
								session.setAttribute("accessToken",accessToken);

								JSONObject json = getFacebookUserJsonByAccessToken(accessToken);
								user = localizeFacebookUser(json);
								session.setAttribute("localisedFacebookUser", user);

							} else {
								log.info("facebook 获取accessToken失败：\naccessToken="+ accessToken);
							}
						}
						
						//获取expires
						if (keyValue[0].equals("expires")) {
							expires = Integer.valueOf(keyValue[1]);
							
							//将expires放入session，避免重复获取
							session.setAttribute("expires", expires);
						}
					}
				}
			}

			chain.doFilter(request, response);
		} else {
			chain.doFilter(request, response);
		}
	}

	/**
	 * 根据code参数获取授权Url
	 * 
	 * @param code
	 *            地址栏的参数
	 * @return
	 */
	private URL getAuthUrlByCode(String code) {

		String url = "https://graph.facebook.com/oauth/access_token?client_id="
				+ app_id + "&redirect_uri=" + app_url + "&client_secret="
				+ secret + "&code=" + code;

		log.info("facebook登录获取授权URL时访问的URL：\n" + url);
		try {
			return new URL(url);
		} catch (MalformedURLException e) {
			log.error("facebook登录获取授权URL时访问的URL出错：\n", e);
			return null;
		}
	}

	/**
	 * 根据授权Url获取访问标记accessToken和有效期限expires

	 * 这样在后台进行也是为了安全考虑，而不是http的get/post
	 * 
	 * @param url
	 *            授权Url
	 * @return
	 */
	private String getAccessTokenByAuthUrl(URL url) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		try {
			InputStream is = url.openStream();
			int r;
			while ((r = is.read()) != -1) {
				baos.write(r);
			}
		} catch (IOException e) {
			log.error("facebook登录的时候读取URL失败,原因：\n", e);
		}
		return new String(baos.toByteArray());
	}

	/**
	 * 根据获得的访问标记accessToken访问获取用户个人信息的json数据
	 * 
	 * @param accessToken
	 *            访问标记
	 * @return
	 */
	private JSONObject getFacebookUserJsonByAccessToken(String accessToken) {
		try {
			JSONObject resp = new JSONObject(IOUtil
					.urlToString(new URL(
							"https://graph.facebook.com/me?access_token="
									+ accessToken)));
			
			log.info("根据访问标记accessToken访问获取用户个人信息的json数据:\n"+resp.toString());
			return resp;

		} catch (Throwable ex) {
			throw new RuntimeException("failed login", ex);
		}
	}

	/**
	 * 根据用户个人信息的json数据，进行我们需要的本地化处理，比如：存入数据库等等
	 * 
	 * @param json
	 *            用户个人信息的json数据
	 * @return
	 */
	private User localizeFacebookUser(JSONObject json) {
		user = new User();

		try {
			String name = json.getString("name");
			if (name != null)
				user.setName(name);
			else
				user.setName("no register name");

			user.setUserName(json.getString("username"));
			user.setEmail(json.getString("email"));
			user.setSnsId(json.getString("id"));
		} catch (JSONException e) {
			log.error("解析facebook返回的json数据失败:\n", e);
		}
		return user;
	}

}

.

• facebookLogin.zip (749.1 KB)
• 下载次数: 111