java微信登录认证

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

这篇文章，主要提供java代码实现，具体官方文档请看微信网页授权

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 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

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 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 getPrivilegeList() {
        return privilegeList;
    }

    public void setPrivilegeList(List privilegeList) {
        this.privilegeList = privilegeList;
    }
}