java 實現 github第三方登陸代碼模板

HttpRequestUtils類

用於方便進行http請求

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;

/**
 * @author cimo
 */
public class HttpRequestUtils {

    /**
     * 向指定 URL 發送POST方法的請求
     *
     * @param url 發送請求的 URL
     * @param param 請求參數,請求參數應該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠程資源的響應結果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            URLConnection conn = realUrl.openConnection();
            // 設置通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("Content-type", "application/json");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setReadTimeout(15000);
            // 發送POST請求必須設置如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection對象對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 發送請求參數
            out.print(param);
            // flush輸出流的緩衝
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader( new InputStreamReader(conn.getInputStream(),"utf-8") );
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送 POST 請求出現異常!"+e);
            e.printStackTrace();
        }
        //使用finally塊來關閉輸出流、輸入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定URL發送GET方法的請求
     *
     * @param url 發送請求的URL
     * @return URL 所代表遠程資源的響應結果
     */
    public static String sendGet(String url) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url;
            URL realUrl = new URL(urlNameString);
            // 打開和URL之間的連接
            URLConnection connection = realUrl.openConnection();
            // 設置通用的請求屬性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立實際的連接
            connection.connect();
            // 定義 BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送GET請求出現異常!" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
    /**
     * 將字符串轉換成map
     * @param responseEntity map字符串
     * @return  map對象
     */
    public static Map<String,String> getMap(String responseEntity) {

        Map<String, String> map = new HashMap<>();
        // 以&來解析字符串
        String[] result = responseEntity.split("\\&");

        for (String str : result) {
            // 以=來解析字符串
            String[] split = str.split("=");
            // 將字符串存入map中
            if (split.length == 1) {
                map.put(split[0], null);
            } else {
                map.put(split[0], split[1]);
            }

        }
        return map;
    }

}

GithubConfig類

用於保存Github授權信息配置文件

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
/**
 * @author cimo
 */
public class GithubConfig {

    /**
     * github授權的 Client ID
     */
    private static final String CLIENT_ID = "你的 Client ID";

    /**
     * github授權的 Client Secret
     */
    private static final String CLIENT_SECRET = "你的 Client Secret";

    /**
     * 結果回調地址
     */
    private static final String CALLBACK_URL = "你在Github上填寫的回調地址";

    /**
     * 獲取code的url
     */
    public static final String CODE_URL = "https://github.com/login/oauth/authorize?client_id="+CLIENT_ID;

    /**
     * @param code 獲取到的code
     * @return 獲取token的url
     */
    public static String getTokenUrl(String code) {
        return "https://github.com/login/oauth/access_token?client_id="+CLIENT_ID+"&client_secret="+CLIENT_SECRET+"&code="+code+"&redirect_uri="+CALLBACK_URL;
    }

    /**
     * @param token 獲取到的token
     * @return 通過token獲取github用戶信息
     */
    public static String getUerInfoUrl(String token) throws IOException {
        String result = "";
        BufferedReader in = null;
        try {
            String baseUrl = "https://api.github.com/user";
            URL realUrl = new URL(baseUrl);
            // 打開和URL之間的連接
            URLConnection connection = realUrl.openConnection();
            //將token加入請求頭
            connection.setRequestProperty("Authorization","token "+token);
            // 建立實際的連接
            connection.connect();
            // 定義 BufferedReader輸入流來讀取URL的響應
            in = new BufferedReader(new InputStreamReader( connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送token請求出現異常!" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;

    }
}

發出請求後回調的地址

這裏爲了方便一點用servlet實現

import javax.servlet.annotation.WebServlet;
import java.io.IOException;

/**
 * @author cimo
 */
@WebServlet(name = "GithubLogingCallBack")
public class GithubLogingCallBack extends javax.servlet.http.HttpServlet {
    @Override
    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {

    }

    @Override
    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {

        //獲取code地址:https://github.com/login/oauth/authorize?client_id=你的client_id
        String code = request.getParameter("code");
        System.out.println("code:"+code);

        //申請令牌
        String result = HttpRequestUtils.sendGet( GithubConfig.getTokenUrl(code) );
        System.out.println("result:"+result);

        //從result中截取令牌
        String access_token = HttpRequestUtils.getMap(result).get("access_token");
        System.out.println("access_token:"+access_token);

        //通過令牌獲取用戶信息
        String userInfo = GithubConfig.getUerInfoUrl(access_token);
        System.out.println("用戶信息:"+userInfo);
        
        //將token加入響應頭,並返回用戶信息
        response.setHeader("Authorization","token "+accessToken);
        response.getWriter().println(userInfo);

    }
}

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