java微信登录认证

你的名字 2020-11-17 09:11 802阅读 0赞

## 1.目标： ##

本篇文章主要是实现微信扫一扫登录功能。

## 2.思路 ##

**微信扫一扫登录的基本思路为：**

*  到公众号配置域名
 *  生成二维码链接
 *  用户扫描二维码
 *  微信回调二维码链接的回调路径
 *  在回调函数中根据code参数获取openId  
    和accessToken，再根据openid和accessToken获取微信用户详细信息（包括头、昵称、地址…）
 *  其他具体业务

## 2.实现： ##

## WeChatUtil ##

import com.alibaba.fastjson.JSON;
    import com.myq.util.HttpUtils;
    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.HttpClientBuilder;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Component;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.UnsupportedEncodingException;
    import java.util.Formatter;
    import java.util.List;
    import java.util.Map;
    import java.util.UUID;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @Component
    public class WeChatUtil {
    
        @Value("${appID}")
        private String appID;
    
        @Value("${appsecret}")
        private String appsecret;
    
        private static Logger loggger = LoggerFactory.getLogger(WeChatUtil.class);
    
        /**
         * 获取认证用户详细信息
         * @param request
         * @param response
         * @return
         * @throws Exception
         */
        public SnsUserInfo getSnsUserInfo(HttpServletRequest request,HttpServletResponse response) {
            // 用户同意授权后，能获取到code
            String code = request.getParameter("code");//拿到code的值
            // 用户同意授权
            if ("authdeny".equals(code)) {
                return null;
            }
            // 获取网页授权access_token
            loggger.info("code:"+code);
            Oauth2Token oauth2Token = getOauth2AccessToken(appID, appsecret, code);
            // 网页授权接口访问凭证
            String accessToken = oauth2Token.getAccessToken();
            // 用户标识
            String openId = oauth2Token.getOpenId();
            // 获取用户信息
            SnsUserInfo snsUserInfo = getSNSUserInfo(accessToken, openId);
            return snsUserInfo;
        }
    
    
        /**
         * 获取网页授权凭证
         *
         * @param appId 公众账号的唯一标识
         * @param appSecret 公众账号的密钥
         * @param code
         * @return WeixinAouth2Token
         */
        public static Oauth2Token getOauth2AccessToken(String appId, String appSecret, String code) {
            Oauth2Token wat = null;
            // 拼接请求地址
            String requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";
            requestUrl = requestUrl.replace("APPID", appId);
            requestUrl = requestUrl.replace("SECRET", appSecret);
            requestUrl = requestUrl.replace("CODE", code);
            // 获取网页授权凭证
            com.alibaba.fastjson.JSONObject jsonObject = JSON.parseObject(get(requestUrl));
            if (null != jsonObject) {
                try {
                    wat = new Oauth2Token();
                    wat.setAccessToken(jsonObject.getString("access_token"));
                    wat.setExpiresIn(jsonObject.getInteger("expires_in"));
                    wat.setRefreshToken(jsonObject.getString("refresh_token"));
                    wat.setOpenId(jsonObject.getString("openid"));
                    wat.setScope(jsonObject.getString("scope"));
                } catch (Exception e) {
                    wat = null;
                    int errorCode = jsonObject.getInteger("errcode");
                    String errorMsg = jsonObject.getString("errmsg");
                    loggger.error("获取网页授权凭证失败 errcode:{} errmsg:{}", errorCode, errorMsg);
                }
            }
            return wat;
        }
    
        /**
         * 通过网页授权获取用户信息
         *
         * @param accessToken 网页授权接口调用凭证
         * @param openId 用户标识
         * @return SNSUserInfo
         */
        public static SnsUserInfo getSNSUserInfo(String accessToken, String openId) {
            SnsUserInfo snsUserInfo = null;
            // 拼接请求地址 s
            String requestUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";
            requestUrl = requestUrl.replace("ACCESS_TOKEN", accessToken).replace("OPENID", openId);
            // 通过网页授权获取用户信息
            com.alibaba.fastjson.JSONObject jsonObject =  JSON.parseObject(get(requestUrl));
    
            if (null != jsonObject) {
                try {
                    snsUserInfo = new SnsUserInfo();
                    // 用户的标识
                    snsUserInfo.setOpenId(jsonObject.getString("openid"));
                    // 昵称
                    snsUserInfo.setNickname(jsonObject.getString("nickname"));
                    // 性别（1是男性，2是女性，0是未知）
                    snsUserInfo.setSex(jsonObject.getInteger("sex"));
                    // 用户所在国家
                    snsUserInfo.setCountry(jsonObject.getString("country"));
                    // 用户所在省份
                    snsUserInfo.setProvince(jsonObject.getString("province"));
                    // 用户所在城市
                    snsUserInfo.setCity(jsonObject.getString("city"));
                    // 用户头像
                    snsUserInfo.setHeadImgUrl(jsonObject.getString("headimgurl"));
                    // 用户特权信息
                    List<String> list = JSON.parseArray(jsonObject.getString("privilege"),String.class);
                    snsUserInfo.setPrivilegeList(list);
                    //与开放平台共用的唯一标识，只有在用户将公众号绑定到微信开放平台帐号后，才会出现该字段。
                    snsUserInfo.setUnionid(jsonObject.getString("unionid"));
                } catch (Exception e) {
                    snsUserInfo = null;
                    int errorCode = jsonObject.getInteger("errcode");
                    String errorMsg = jsonObject.getString("errmsg");
                    loggger.error("获取用户信息失败 errcode:{} errmsg:{}", errorCode, errorMsg);
                }
            }
            return snsUserInfo;
        }
    
    
        //http GET  Request
        public static String get(String url){
             CloseableHttpClient httpClient = HttpClientBuilder.create().build();
            StringBuffer sb = new StringBuffer();
            HttpGet httpGet = new HttpGet(url);
            try {
                HttpResponse response = httpClient.execute(httpGet);           //1
    
                HttpEntity entity = response.getEntity();
                InputStreamReader reader = new InputStreamReader(entity.getContent(),"utf-8");
                char [] charbufer;
                while (0<reader.read(charbufer=new char[10])){
                    sb.append(charbufer);
                }
            }catch (IOException e){//1
                e.printStackTrace();
            }finally {
                httpGet.releaseConnection();
            }
            return sb.toString();
        }
    }

## Oauth2Token ##

public class Oauth2Token {
        // 网页授权接口调用凭证
        private String accessToken;
        // 凭证有效时长
        private int expiresIn;
        // 用于刷新凭证
        private String refreshToken;
        // 用户标识
        private String openId;
        // 用户授权作用域
        private String scope;
    
        public String getAccessToken() {
            return accessToken;
        }
    
        public void setAccessToken(String accessToken) {
            this.accessToken = accessToken;
        }
    
        public int getExpiresIn() {
            return expiresIn;
        }
    
        public void setExpiresIn(int expiresIn) {
            this.expiresIn = expiresIn;
        }
    
        public String getRefreshToken() {
            return refreshToken;
        }
    
        public void setRefreshToken(String refreshToken) {
            this.refreshToken = refreshToken;
        }
    
        public String getOpenId() {
            return openId;
        }
    
        public void setOpenId(String openId) {
            this.openId = openId;
        }
    
        public String getScope() {
            return scope;
        }
    
        public void setScope(String scope) {
            this.scope = scope;
        }
    }

## SnsUserInfo ##

import java.util.List;
    
     
    public class SnsUserInfo {
        // 用户标识
        private String openId;
        // 用户昵称
        private String nickname;
        // 性别（1是男性，2是女性，0是未知）
        private int sex;
        // 国家
        private String country;
        // 省份
        private String province;
        // 城市
        private String city;
        // 用户头像链接
        private String headImgUrl;
        // 用户特权信息
        private List<String> privilegeList;
    
        private String unionid;
    
        public String getUnionid() {
            return unionid;
        }
    
        public void setUnionid(String unionid) {
            this.unionid = unionid;
        }
    
        public String getOpenId() {
            return openId;
        }
    
        public void setOpenId(String openId) {
            this.openId = openId;
        }
    
        public String getNickname() {
            return nickname;
        }
    
        public void setNickname(String nickname) {
            this.nickname = nickname;
        }
    
        public int getSex() {
            return sex;
        }
    
        public void setSex(int sex) {
            this.sex = sex;
        }
    
        public String getCountry() {
            return country;
        }
    
        public void setCountry(String country) {
            this.country = country;
        }
    
        public String getProvince() {
            return province;
        }
    
        public void setProvince(String province) {
            this.province = province;
        }
    
        public String getCity() {
            return city;
        }
    
        public void setCity(String city) {
            this.city = city;
        }
    
        public String getHeadImgUrl() {
            return headImgUrl;
        }
    
        public void setHeadImgUrl(String headImgUrl) {
            this.headImgUrl = headImgUrl;
        }
    
        public List<String> getPrivilegeList() {
            return privilegeList;
        }
    
        public void setPrivilegeList(List<String> privilegeList) {
            this.privilegeList = privilegeList;
        }
    }