微信授权登录(java实现)

微信公众平台开发文档

微信授权登录获取用户信息有2种方式：
1.静默授权获取用户信息、
2.非静默授权弹出授权界面，用户确认之后获取用户信息(这种方法能够获取到更多信息)。

开发前准备：

1.获取到AppID
2.AppSecret
3.设置IP白名单
4.添加网页授权域名
公众号设置->功能设置

前端获取code：

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

通过code换取网页授权access_token

https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

拉取用户信息

https://api.weixin.qq.com/sns/userinfo?access_token=%s&openid=%s&lang=zh_CN

<dependency><groupId>com.github.kevinsawicki</groupId><artifactId>http-request</artifactId><version>6.0</version>
</dependency>
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.4</version><scope>provided</scope>
</dependency>

package com.pica.cloud.patient.resident.server.util;import com.alibaba.fastjson.JSON;
import com.github.kevinsawicki.http.HttpRequest;
import com.pica.cloud.patient.resident.common.constants.CommonCons;
import com.pica.cloud.patient.resident.server.configuration.BeanConfiguration;
import com.pica.cloud.patient.resident.server.vo.AccessTokenVo;
import com.pica.cloud.patient.resident.server.vo.WechatUserInfoVo;
import lombok.extern.slf4j.Slf4j;
import lombok.var;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;/*** @ClassName WechatUtil* @Description* @Author Jun.li0101* @Date 2019/3/19 16:43* @ModifyDate 2019/3/19 16:43* @Version 1.0*/
@Component
@Slf4j
public class WechatUtil {private static BeanConfiguration configuration;private final static Integer SUCCESS = 0;@Autowiredpublic WechatUtil(BeanConfiguration config) {WechatUtil.configuration = config;}public static AccessTokenVo getWechatAccessToken(String code) {if (code == null) {return null;}String url = String.format(CommonCons.Wechat.LOGIN_ACCESS_TOKEN_URL, configuration.getAppId(), configuration.getAppSecret(), code);try {String result = HttpRequest.get(url).body();log.info("getWechatAccessToken result:{}", result);var token = JSON.parseObject(result, AccessTokenVo.class);if (token.getErrCode() == null || SUCCESS.equals(token.getErrCode())) {log.info("get wechat access token:{}", token);return token;} else {log.warn("code {} request wechat api get access token error:{}", code, token);}} catch (Exception ex) {log.error("getWechatAccessToken error", ex);}return null;}public static WechatUserInfoVo getWechatUserInfo(AccessTokenVo tokenVo) {if (tokenVo == null) {return null;}var url = String.format(CommonCons.Wechat.GET_USER_INFO_URL, tokenVo.getAccessToken(), tokenVo.getOpenId());try {String result = HttpRequest.get(url).body();var info = JSON.parseObject(result, WechatUserInfoVo.class);if (info.getErrCode() == null || SUCCESS.equals(info.getErrCode())) {log.info("get wechat user info:{}", info);return info;} else {log.warn("request wechat api get user information error:{}", info);}} catch (Exception ex) {log.error("getWechatUserInfo error", ex);}return null;}}

package com.pica.cloud.patient.resident.server.vo;import com.alibaba.fastjson.annotation.JSONField;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;/*** @ClassName AccessTokenVo* @Description {@link} 参考 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317851&token=&lang=zh_CN* @Author Jun.li0101* @Date 2019/3/19 17:15* @ModifyDate 2019/3/19 17:15* @Version 1.0*/
@Getter
@Setter
@ToString
public class AccessTokenVo extends WechatCommonVo {@JSONField(format = "access_token")private String accessToken;@JSONField(format = "expires_in")private Integer expiresIn;@JSONField(format = "refresh_token")private String refreshToken;@JSONField(format = "openid")private String openId;@JSONField(format = "scope")private String scope;@JSONField(format = "unionid")private String unionId;}

//
package com.pica.cloud.patient.resident.server.vo;import com.alibaba.fastjson.annotation.JSONField;
import lombok.Data;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;/*** @ClassName WechatUserInfoVo* @Description {@link} 参考 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317853&token=&lang=zh_CN* @Author Jun.li0101* @Date 2019/3/19 18:59* @ModifyDate 2019/3/19 18:59* @Version 1.0*/
@Getter
@Setter
@ToString
public class WechatUserInfoVo extends WechatCommonVo {@JSONField(format = "openid")private String openid;@JSONField(format = "nickname")private String nickname;@JSONField(format = "sex")private Integer sex;@JSONField(format = "province")private String province;@JSONField(format = "city")private String city;@JSONField(format = "country")private String country;@JSONField(format = "headimgurl")private String headImgurl;@JSONField(format = "unionid")private String unionid;@JSONField(format = "language")private String language;}

微信登录表情特殊符号处理
据库以及JDBC默认的字符集都是utf8，在存储emoji表情时会报错：

Incorrect string value: '\xF0\x9F\xA4\xA9' for column 'nickname'

原因是utf8不支持4字节的emoji表情。

具体如下：

utf8与utf8mb4具有相同存储特性：相同的代码值，相同的编码，相同的长度。不过utf8mb4扩展到一个字符最多可有4位元，所以能支持更多的位元集。utf8mb4不只兼容utf8，还能比utf8能展示更新的字符。将编码改为utf8mb4外不需要做其他转换。

为了要跟国际接轨，原本的utf8编码在存储某些国家的文字(或是罕见字)已经不敷使用，因此在mysql5.5.3版以上，可以开始使用4-Byte UTF-8 Unicode的编码方式。

Mysql查看版本方式：

select version();

Mysql在5.5.3版本之后增加了utf8mb4字符编码，mb4即most bytes 4。简单说utf8mb4是utf8的超集并完全兼容utf8，能够用四个字元存储更多的字符。

utf8mb4可以向下兼容utf8，而且比utf8可以表示更多的字符。此外，将编码改为utf8mb4不需要其他转换。

解决办法：

1.修改mysql配置文件my.cnf，同时将库表的默认字符集都改为utf8mb4；

default-character-set=utf8mb4

同时修改项目的JDBC连接配置

spring.datasource.tomcat.init-s-q-l=SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci