第三方登录（Facebook） java验证

https://developers.facebook.com/docs/facebook-login/overview 官方文档facebook登录验证与微信一样

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



public class FacebookAuthService
{
	private static final Logger logger = LoggerFactory.getLogger(FacebookAuthService.class);
	
	public static final String FB_AUTH_LOGIN_URL = "https://graph.facebook.com/oauth/access_token";
	public static final String FB_USERINFO_URL = "https://graph.facebook.com/me";
	//appid和appSecret 是facebook上申请
	//AppId
	public static final String FB_APP_ID = "15751398427*****";
	//AppSecret
	public static final String FB_APP_KEY = "ac6fb2cda5d855fc20920289a4d*****";
	//获取用户的那些信息
	public static final String FB_USER_FIELDS = "id,cover,email,gender,name,languages,timezone,third_party_id,updated_time";

	

	
	public UserInfoData checkLoginWithToken(String accessToken) {
		try {
			String userUrl = String.format("%s?access_token=%s&fields=%s",
					FB_USERINFO_URL, accessToken, FB_USER_FIELDS);
			String userRet = httpClient.get(userUrl);
			UserInfoData userInfoData = new UserInfoData();
			JSONObject json = new JSONObject(userRet);
			String email = json.optString("email");
			if (email != null) {
				email = email.replace("\\u0040", "@");
			}
//icon = "https://graph.facebook.com/v2.8/"+json.getString("id")+"/picture?height=500&width=500";   获取头像大图
			userInfoData.setLoginId(json.getString("id"));
			userInfoData.setGender(json.optString("gender"));
			userInfoData.setIcon(json.optString("cover"));
			userInfoData.setEmail(email);
			userInfoData.setName(json.optString("name"));
			userInfoData.setOpenId(json.optString("third_party_id"));
			userInfoData.setAuthToken(accessToken);

			return userInfoData;
		} catch (Exception ex) {
			logger.warn("verify the access token failed: {}", ex.getMessage());
			return null;
		}
	}
	
	
	private static String paramsToString(Map params) {
		StringBuilder sb = new StringBuilder();
		try{
			for (String key : params.keySet()) {
				sb.append(String.format("&%s=%s", key, URLEncoder.encode(params.get(key),StandardCharsets.UTF_8.toString())));
			}
		}catch(UnsupportedEncodingException e){
			logger.warn("{}: encode url parameters failed", e.getMessage());
		}
		return sb.length() > 0 ? "?".concat(sb.substring(1)) : "";
	}
	
	private static HttpResponse sendRequest(CloseableHttpClient httpclient, HttpUriRequest httpost)
			throws ClientProtocolException, IOException {
		HttpResponse response = null;
		response = httpclient.execute(httpost);
		return response;
	}
	
	private static String parseResponse(HttpResponse response) {
		logger.info("get response from http server..");
		HttpEntity entity = response.getEntity();

		logger.info("response status: " + response.getStatusLine());
		Charset charset = ContentType.getOrDefault(entity).getCharset();
		if (charset != null) {
			logger.info(charset.name());
		}

		String body = null;
		try {
			body = EntityUtils.toString(entity, "utf-8");
			logger.info("body " + body);
		} catch (IOException e) {
			logger.warn("{}: cannot parse the entity", e.getMessage());
		}

		return body;
	}

}

public static String get(String url, Map params) {
		String body = null;
		CloseableHttpClient httpClient = null;
		try {
			httpClient = HttpClientBuilder.create().build();
			logger.info("create httppost:" + url);
			String queryString = paramsToString(params);
			HttpGet get = new HttpGet(url.concat(queryString));
			get.addHeader("Accept-Charset","utf-8");
			
			
			
			//设置网络代理
			RequestConfig defaultRequestConfig = RequestConfig.custom()
					.setSocketTimeout(5000)
					.setConnectTimeout(5000)
					.setConnectionRequestTimeout(5000)
					.setStaleConnectionCheckEnabled(true)
					.build();
			RequestConfig requestConfig = RequestConfig.copy(defaultRequestConfig).
					setProxy(new HttpHost("192.168.8.223", 7777)) //代理地址  和 端口
				    .build();
			get.setConfig(requestConfig);
			HttpResponse response = sendRequest(httpClient, get);
			body = parseResponse(response);
		} catch (IOException e) {
			logger.error("send post request failed: {}", e);
		} finally {
			try {  
				httpClient.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }
		}

		return body;
	}