准备工作

1.云服务器

2.备案的域名

3.本地调试需要修改hosts文件，将域名映射到127.0.0.1

一、申请QQ互联，并成为开发者

QQ互联：https://connect.qq.com/index.html

登录后，点击头像，进入认证页面，填写信息，等待审核。

 审核通过后，点击创建应用

 

审核通过后，就可以使用APP ID 和 APP Key

 

二、编写java代码

github:https://github.com/sansheng741/QQLogin

项目结构

yml配置

server:
  port: 80

qq:
  oauth:
    http: //QQ互联中填写的网站地址

导入pom依赖

<!--httpclient-->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.6</version>
</dependency>
<!--阿里 JSON-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

QQController

package com.ck.blog.controller;

import com.alibaba.fastjson.JSONObject;
import com.ck.blog.exception.StateErrorException;
import com.ck.blog.utils.QQHttpClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.net.URLEncoder;
import java.util.UUID;

/**
 * @author ck
 * @create 2019-05-18 20:32
 */
@Controller
public class QQController {


    @Value("${qq.oauth.http}")
    private String http;

    /**
     * 发起请求
     * @param session
     * @return
     */
    @GetMapping("/qq/oauth")
    public String qq(HttpSession session){
        //QQ互联中的回调地址
        String backUrl = http + "/qq/callback";

        //用于第三方应用防止CSRF攻击
        String uuid = UUID.randomUUID().toString().replaceAll("-","");
        session.setAttribute("state",uuid);

        //Step1：获取Authorization Code
        String url = "https://graph.qq.com/oauth2.0/authorize?response_type=code"+
                "&client_id=" + QQHttpClient.APPID +
                "&redirect_uri=" + URLEncoder.encode(backUrl) +
                "&state=" + uuid;

        return "redirect:" + url;
    }

    /**
     * QQ回调
     * @param request
     * @return
     */
    @GetMapping("/qq/callback")
    public String qqcallback(HttpServletRequest request) throws Exception {
        HttpSession session = request.getSession();
        //qq返回的信息：http://graph.qq.com/demo/index.jsp?code=9A5F************************06AF&state=test
        String code = request.getParameter("code");
        String state = request.getParameter("state");
        String uuid = (String) session.getAttribute("state");

        if(uuid != null){
            if(!uuid.equals(state)){
                throw new StateErrorException("QQ,state错误");
            }
        }


        //Step2：通过Authorization Code获取Access Token
        String backUrl = http + "/qq/callback";
        String url = "https://graph.qq.com/oauth2.0/token?grant_type=authorization_code"+
                "&client_id=" + QQHttpClient.APPID +
                "&client_secret=" + QQHttpClient.APPKEY +
                "&code=" + code +
                "&redirect_uri=" + backUrl;

        String access_token = QQHttpClient.getAccessToken(url);

        //Step3: 获取回调后的 openid 值
        url = "https://graph.qq.com/oauth2.0/me?access_token=" + access_token;
        String openid = QQHttpClient.getOpenID(url);

        //Step4：获取QQ用户信息
        url = "https://graph.qq.com/user/get_user_info?access_token=" + access_token +
                "&oauth_consumer_key="+ QQHttpClient.APPID +
                "&openid=" + openid;

        JSONObject jsonObject = QQHttpClient.getUserInfo(url);

        //也可以放到Redis和mysql中
        session.setAttribute("openid",openid);  //openid,用来唯一标识qq用户
        session.setAttribute("nickname",(String)jsonObject.get("nickname")); //QQ名
        session.setAttribute("figureurl_qq_2",(String)jsonObject.get("figureurl_qq_2")); //大小为100*100像素的QQ头像URL


        return "redirect:/home";
    }

}

 QQHttpClient 

package com.ck.blog.utils;

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

/**
 * @author ck
 * @create 2019-05-18 20:32
 * QQ工具类（主要用于解析QQ返回的信息）
 */
public class QQHttpClient {
    //QQ互联中提供的 appid 和 appkey
    public static final String APPID = "xxxxxxxx";

    public static final String APPKEY = "xxxxxxxxxx";


    private static JSONObject parseJSONP(String jsonp){
        int startIndex = jsonp.indexOf("(");
        int endIndex = jsonp.lastIndexOf(")");

        String json = jsonp.substring(startIndex + 1,endIndex);

        return JSONObject.parseObject(json);
    }
    //qq返回信息：access_token=FE04************************CCE2&expires_in=7776000&refresh_token=88E4************************BE14
    public static String getAccessToken(String url) throws IOException {
        CloseableHttpClient client = HttpClients.createDefault();
        String token = null;

        HttpGet httpGet = new HttpGet(url);
        HttpResponse response = client.execute(httpGet);
        HttpEntity entity = response.getEntity();

        if(entity != null){
            String result = EntityUtils.toString(entity,"UTF-8");
            if(result.indexOf("access_token") >= 0){
                String[] array = result.split("&");
                for (String str : array){
                    if(str.indexOf("access_token") >= 0){
                        token = str.substring(str.indexOf("=") + 1);
                        break;
                    }
                }
            }
        }

        httpGet.releaseConnection();
        return token;
    }
    //qq返回信息：callback( {"client_id":"YOUR_APPID","openid":"YOUR_OPENID"} ); 需要用到上面自己定义的解析方法parseJSONP
    public static String getOpenID(String url) throws IOException {
        JSONObject jsonObject = null;
        CloseableHttpClient client = HttpClients.createDefault();

        HttpGet httpGet = new HttpGet(url);
        HttpResponse response = client.execute(httpGet);
        HttpEntity entity = response.getEntity();

        if(entity != null){
            String result = EntityUtils.toString(entity,"UTF-8");
            jsonObject = parseJSONP(result);
        }

        httpGet.releaseConnection();

        if(jsonObject != null){
            return jsonObject.getString("openid");
        }else {
            return null;
        }
    }
    
    //qq返回信息：{ "ret":0, "msg":"", "nickname":"YOUR_NICK_NAME", ... }，为JSON格式，直接使用JSONObject对象解析
    public static JSONObject getUserInfo(String url) throws IOException {
        JSONObject jsonObject = null;
        CloseableHttpClient client = HttpClients.createDefault();

        HttpGet httpGet = new HttpGet(url);
        HttpResponse response = client.execute(httpGet);
        HttpEntity entity = response.getEntity();


        if(entity != null){
            String result = EntityUtils.toString(entity,"UTF-8");
            jsonObject = JSONObject.parseObject(result);
        }

        httpGet.releaseConnection();

        return jsonObject;
    }
}

IndexController 

package com.ck.blog.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpSession;

/**
 * @author ck
 * @create 2019-05-18 20:31
 */
@Controller
public class IndexController {

    @GetMapping("/index")
    public String index(){
        return "index";
    }

    @GetMapping("/home")
    public String home(HttpSession session, Model model){
        String openid = (String) session.getAttribute("openid");
        String nickname = (String) session.getAttribute("nickname");
        String figureurl_qq_2 = (String) session.getAttribute("figureurl_qq_2");

        model.addAttribute("openid",openid);
        model.addAttribute("nickname",nickname);
        model.addAttribute("figureurl_qq_2",figureurl_qq_2);

        return "home";
    }
}

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>登录页</title>
</head>
<body>
<a href="/qq/oauth">QQ授权登录</a>
</body>
</html>

home.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>QQ授权成功</title>
</head>
<body>
<div>
    openid:[[${openid}]]
</div>
<div>
    nickName:[[${nickname}]]
</div>
<div>
    <img th:src="${figureurl_qq_2}">
</div>
</body>
</html>

 

 效果图