springboot实现网站微信扫码登录

一、创建网站应用

1. 在微信开发平台上面创建以个网站应用

2. 微信开发平台地址 https://open.weixin.qq.com/https://open.weixin.qq.com/

二、配置基本信息

1. 把公用的信息放在application.yml中

  #微信开放平台创建的网站应用的appid
  AppID: *********
  #微信开放平台创建的网站应用的appsecret
  AppSecret: ***********************************
  scope: snsapi_login
  #微信开放平台创建的网站 设置的授权回调域
  redirect_url: 自己的回调地址，必须是公网能够访问的

2. 获取微信二维码信息

  　@Value("${AppID}")
    private String appid;

    @Value("${redirect_url}")
    private String callBack;

    @Value("${scope}")
    private String scope;

    @Value("${AppSecret}")
    private String appsecret;
    
    @Override
    public String getWechatCode() {
        try {
            String oauthUrl = "https://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect";
            String redirect_uri = URLEncoder.encode(callBack, "utf-8");
            oauthUrl =  oauthUrl.replace("APPID",appid).replace("REDIRECT_URI",redirect_uri).replace("SCOPE",scope);
            logger.info(oauthUrl);
            return ReturnMessage.success(0,"获取完成",oauthUrl);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ReturnMessage.fail(44,"失败");
    }

备注：在前端页面直接加载oauthUrl 就可以出现二维码界面了。直接用的微信的页面，也可以根据自己的爱好进行设计页面。如下图
 

3. 接收扫码之后的信息

　　@Override
    public String callBackUserInfo(String code, String state) {
        try {
            //1.通过code获取access_token
            String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";
            url = url.replace("APPID",appid).replace("SECRET",appsecret).replace("CODE",code);
            JSONObject tokenInfoObject = HttpUtils.httpGet(url);
            logger.info("tokenInfoObject:{}",tokenInfoObject);

            //2.通过access_token和openid获取用户信息
            String userInfoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID";
            userInfoUrl = userInfoUrl.replace("ACCESS_TOKEN",tokenInfoObject.getString("access_token")).replace("OPENID",tokenInfoObject.getString("openid"));
            JSONObject userInfoStr = HttpUtils.httpGet(userInfoUrl);
            logger.info("userInfoObject:{}",userInfoStr);
            if (userInfoStr == null) {
                return ReturnMessage.fail(40,"获取失败");
            }
            //3.根据uuid查询用户是否存在，如果存在直接登录。如果不存在则自动注册，在登录
            UserInfoModel userInfoByWechat = iUserDao.getUserInfoByWechat(userInfoStr.get("unionid").toString());
            if (userInfoByWechat != null) {
                return ReturnMessage.success(0,"获取成功",userInfoByWechat);
            }
            //4.数据库添加用户信息
            String username = userInfoStr.get("nickname").toString();
            String unionid = userInfoStr.get("unionid").toString();
            UserInfoBean userInfoBean = new UserInfoBean();
            userInfoBean.setUuid(unionid);
            userInfoBean.setUsername(username);
            // 微信登录
            userInfoBean.setStatus(2);
            iUserDao.insertUser(userInfoBean);
            //5.根据uuid查询新注册的用户信息
            UserInfoModel userInfoModel= iUserDao.getUserInfoByWechat(unionid);
            if (userInfoModel == null) {
                return ReturnMessage.fail(400,"用户添加失败，请重新操作");
            }
            return ReturnMessage.success(0,"获取成功",userInfoModel);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ReturnMessage.fail(400,"获取失败");
    }
httpUtil--这部分代码是在网上找的，但是这个是后来写的。如果发现原作者请告知
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

/**
 * 封装http get post
 */
public class HttpUtils {

    private static Logger logger = LoggerFactory.getLogger(HttpUtils.class); // 日志记录

    private static RequestConfig requestConfig = null;

    static {
        // 设置请求和传输超时时
        requestConfig = RequestConfig.custom().setSocketTimeout(2000).setConnectTimeout(2000).build();
    }

    /**
     * post请求传输json参数
     *
     * @param url       url地址
     * @param jsonParam 参数
     * @return
     */
    public static JSONObject httpPost(String url, JSONObject jsonParam) {
        // post请求返回结果
        CloseableHttpClient httpClient = HttpClients.createDefault();
        JSONObject jsonResult = null;
        HttpPost httpPost = new HttpPost(url);
        // 设置请求和传输超时时请求
        httpPost.setConfig(requestConfig);
        try {
            System.out.println(jsonParam);
            if (null != jsonParam) {
                // 解决中文乱码问题
                StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");
                entity.setContentEncoding("UTF-8");
                entity.setContentType("application/json");
                httpPost.setEntity(entity);
            }
            System.out.println(jsonParam);
            CloseableHttpResponse result = httpClient.execute(httpPost);
            // 请求发请求成功，并得到响应
            if (result.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                String str = "";
                try {
                    // 读取服务器返回过来的json字符串数
                    str = EntityUtils.toString(result.getEntity(), "utf-8");
                    // 把json字符串转换成json对象
                    jsonResult = JSONObject.parseObject(str);
                } catch (Exception e) {
                    logger.error("post请求提交失败:" + url, e);
                }
            }
        } catch (IOException e) {
            logger.error("post请求提交失败:" + url, e);
        } finally {
            httpPost.releaseConnection();
        }
        return jsonResult;
    }

    /**
     * post请求传输String参数 例如：name=Jack&sex=1&type=2
     * Content-type:application/x-www-form-urlencoded
     *
     * @param url      url地址
     * @param strParam 参数
     * @return
     */
    public static JSONObject httpPost(String url, String strParam) {
        // post请求返回结果
        CloseableHttpClient httpClient = HttpClients.createDefault();
        JSONObject jsonResult = null;
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);
        try {
            if (null != strParam) {
                // 解决中文乱码问题
                StringEntity entity = new StringEntity(strParam, "utf-8");
                entity.setContentEncoding("UTF-8");
                entity.setContentType("application/x-www-form-urlencoded");
                httpPost.setEntity(entity);
            }
            CloseableHttpResponse result = httpClient.execute(httpPost);
            // 请求发宋成功，并得到响应
            if (result.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                String str = "";
                try {
                    // 读取服务器返回过来的json字符串数据
                    str = EntityUtils.toString(result.getEntity(), "utf-8");
                    // 把json字符串转换成json对象
                    jsonResult = JSONObject.parseObject(str);
                } catch (Exception e) {
                    logger.error("post请求提交失败:" + url, e);
                }
            }
        } catch (IOException e) {
            logger.error("post请求提交失败:" + url, e);
        } finally {
            httpPost.releaseConnection();
        }
        return jsonResult;
    }

    /**
     * 发送get请求
     *
     * @param url 路径
     * @return
     */
    public static JSONObject httpGet(String url) {
        // get请求返回结果
        JSONObject jsonResult = null;
        CloseableHttpClient client = HttpClients.createDefault();
        // 发送get请求
        HttpGet request = new HttpGet(url);
        request.setConfig(requestConfig);
        try {
            CloseableHttpResponse response = client.execute(request);

            // 请求发送成功，并得到响应
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                // 读取服务器返回过来的json字符串数组
                HttpEntity entity = response.getEntity();
                String strResult = EntityUtils.toString(entity, "utf-8");
                // 把json字符串转换成json对象
                jsonResult = JSONObject.parseObject(strResult);
            } else {
                logger.error("get请求提交失败:" + url);
            }
        } catch (IOException e) {
            logger.error("get请求提交失败:" + url, e);
        } finally {
            request.releaseConnection();
        }
        return jsonResult;
    }

}


作者：shmilylyp
链接：https://www.jianshu.com/p/ce506c35c9bb
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
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原文地址：https://www.cnblogs.com/niudaxianren/p/12691833.html