微信小程序登陆

一 问题引入

我们之前的登陆都是：网页http传来请求，我们java来做这个请求的校验。

但是如果微信小程序登陆，就要用到相关的api来实现。

二 快速入门

1 引入依赖

官方依赖，在里面找合适的，去设置版本号。由于我这里在父工程就设置过了，所以省略

Maven Repository: com.github.binarywang >> weixin-java-miniapp (mvnrepository.com)

<dependencies>
    <dependency>
        <groupId>com.github.binarywang</groupId>
        <artifactId>weixin-java-miniapp</artifactId>
    </dependency>

2 配置类

使用微信小程序api要设置微信小程序的id和密钥。我们在yml文件设置，并自己设置配置类来读取

wx:
  miniapp:
    appId: 你的微信小程序id  # 小程序微信公众平台appId
    secret: 你的微信小程序id秘钥  # 小程序微信公众平台api秘钥

@Component
@Data
@ConfigurationProperties(prefix = "wx.miniapp")
public class WxConfigProperties {
    private String appId;
    private String secret;
}

3 将微信小程序对象放入spring中

package com.atguigu.daijia.customer.config;

import cn.binarywang.wx.miniapp.api.WxMaService;
import cn.binarywang.wx.miniapp.api.impl.WxMaServiceImpl;
import cn.binarywang.wx.miniapp.config.impl.WxMaDefaultConfigImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Component
public class WxConfigOperator {

    @Autowired
    private WxConfigProperties wxConfigProperties;

    @Bean
    public WxMaService wxMaService() {
        //微信小程序id和秘钥
        WxMaDefaultConfigImpl wxMaConfig = new WxMaDefaultConfigImpl();
        wxMaConfig.setAppid(wxConfigProperties.getAppId());
        wxMaConfig.setSecret(wxConfigProperties.getSecret());

        WxMaService service = new WxMaServiceImpl();
        service.setWxMaConfig(wxMaConfig);
        return service;
    }
}

4 具体实现登陆

service层

实现思路：前端约定，从前端传来code，传回去用户的id。

我们先用微信小程序的方法来解析code，获得openid。判断是否是第一次登陆。如果是，则将信息保存到数据库，并返回用户id。如果不是直接返回用户id。

package com.atguigu.daijia.customer.service.impl;

import cn.binarywang.wx.miniapp.api.WxMaService;
import cn.binarywang.wx.miniapp.bean.WxMaJscode2SessionResult;
import com.atguigu.daijia.customer.mapper.CustomerInfoMapper;
import com.atguigu.daijia.customer.mapper.CustomerLoginLogMapper;
import com.atguigu.daijia.customer.service.CustomerInfoService;
import com.atguigu.daijia.model.entity.customer.CustomerInfo;
import com.atguigu.daijia.model.entity.customer.CustomerLoginLog;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.error.WxErrorException;
import org.checkerframework.checker.units.qual.A;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Slf4j
@Service
@SuppressWarnings({"unchecked", "rawtypes"})
public class CustomerInfoServiceImpl extends ServiceImpl<CustomerInfoMapper, CustomerInfo> implements CustomerInfoService {

    @Autowired
    private WxMaService wxMaService;

    @Autowired
    private CustomerInfoMapper customerInfoMapper;
    
    
    @Autowired
    private CustomerLoginLogMapper customerLoginLogMapper;

    // 微信小程序登陆
    @Override
    public Long login(String code) {
        //1 获取code值，使用微信工具包对象，获取微信唯一标识openid
        String openid = null;
        try {
            WxMaJscode2SessionResult sessionInfo =
                    wxMaService.getUserService().getSessionInfo(code);
            openid = sessionInfo.getOpenid();
        } catch (WxErrorException e) {
            throw new RuntimeException(e);
        }

        //2 根据openid查询数据库表，判断是否第一次登录
        //如果openid不存在返回null，如果存在返回一条记录
        //select * from customer_info ci where ci.wx_open_id = ''
        LambdaQueryWrapper<CustomerInfo> lqw =  new LambdaQueryWrapper<>();
        lqw.eq(CustomerInfo::getWxOpenId, openid);
        CustomerInfo customerInfo = customerInfoMapper.selectOne(lqw);

        //3 如果第一次登录，添加信息到用户表
        if(customerInfo == null) {
            customerInfo = new CustomerInfo();
            customerInfo.setNickname(String.valueOf(System.currentTimeMillis()));
            customerInfo.setAvatarUrl("https://oss.aliyuncs.com/aliyun_id_photo_bucket/default_handsome.jpg");
            customerInfo.setWxOpenId(openid);
            customerInfoMapper.insert(customerInfo);
        }

        //4 记录登录日志信息
        CustomerLoginLog customerLoginLog = new CustomerLoginLog();
        customerLoginLog.setCustomerId(customerInfo.getId());
        customerLoginLog.setMsg("小程序登录");
        customerLoginLogMapper.insert(customerLoginLog);


        //5 返回用户id
        return customerInfo.getId();
    }
}