在spring端发送微信登录请求

微信小程序的配置

application-dev.yml

sky:
  wechat:
    appid: wx7c3cfb677bfc2fca
    secret: 26fdab94f4910262d2b3648a947fce03

application.yml

配置jwt
配置秘钥

sky:
  jwt:
    # 设置jwt签名加密时使用的秘钥
    admin-secret-key: itcast
    # 设置jwt过期时间
    admin-ttl: 720000000
    # 设置前端传递过来的令牌名称
    admin-token-name: token
    # 设置jwt签名加密时使用的秘钥
    user-secret-key: itheima
    # 设置jwt过期时间
    user-ttl: 720000000
    # 设置前端传递过来的令牌名称
    user-token-name: authentication
  wechat:
    appid: ${sky.wechat.appid}
    secret: ${sky.wechat.secret}

拦截器

拦截微信客户端的所有请求

java">package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {



        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id：", userId);
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}

在全局配置中新增微信请求拦截器

新增刚刚的拦截器，放行登录请求

java">package com.sky.config;


import java.util.List;

/**
 * 配置类，注册web层相关组件
 */
@Configuration
@Slf4j
public class WebMvcConfiguration extends WebMvcConfigurationSupport {

    @Autowired
    private JwtTokenAdminInterceptor jwtTokenAdminInterceptor;

    @Autowired
    private JwtTokenUserInterceptor jwtTokenUserInterceptor;


    /**
     * 注册自定义拦截器
     *
     * @param registry
     */
    protected void addInterceptors(InterceptorRegistry registry) {
        log.info("开始注册自定义拦截器...");
        registry.addInterceptor(jwtTokenAdminInterceptor)
                .addPathPatterns("/admin/**")
                .excludePathPatterns("/admin/employee/login")
                .excludePathPatterns("/admin/employee/download")
        ;
        registry.addInterceptor(jwtTokenUserInterceptor)
                .addPathPatterns("/user/**")
                .excludePathPatterns("/user/user/login")
                .excludePathPatterns("/user/shop/status");

    }
}

登录controller

为的是获取openid，返回用户信息

java">package com.sky.controller.user;

import com.sky.constant.JwtClaimsConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.properties.JwtProperties;
import com.sky.result.Result;
import com.sky.service.UserService;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("/user/user")
@Api(tags = "C端用户接口")
@Slf4j
public class UserController {

    private final UserService userService;
    private final JwtProperties jwtProperties;

    @Autowired
    public UserController(UserService userService, JwtProperties jwtProperties) {
        this.userService = userService;
        this.jwtProperties = jwtProperties;
    }



    /**
     * 微信小程序登录
     */
    @PostMapping("/login")
    @ApiOperation(value = "微信小程序登录")
    public Result<UserLoginVO> login(@RequestBody UserLoginDTO userLoginDTO) {
        log.info("微信小程序登录");
        //微信登录
        User user = userService.wxLogin(userLoginDTO);
        // 为微信登录的用户生成token
        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID, user.getId());
        String token = JwtUtil.createJWT(jwtProperties.getUserSecretKey(), jwtProperties.getUserTtl(), claims);
        UserLoginVO userLoginVO = UserLoginVO.builder()
                .id(user.getId())
                .openid(user.getOpenid())
                .token(token)
                .build();
        return Result.success(userLoginVO);
    }
}

service层

java">@Service
public interface UserService {

    User wxLogin(UserLoginDTO userLoginDTO);
}

请求地址：https://api.weixin.qq.com/sns/jscode2session
参数有四个：
appid：小程序id
secret：小程序秘钥
js_code：临时登录码
grant_type：固定值 authorization_code

java">package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.gson.JsonObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.net.URISyntaxException;
import java.time.LocalDateTime;
import java.util.HashMap;


@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static  final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    private WeChatProperties wxProperties;

    private UserMapper userMapper;

    @Autowired
    public UserServiceImpl(WeChatProperties wxProperties, UserMapper userMapper) {
        this.wxProperties = wxProperties;
        this.userMapper = userMapper;
    }

    /**
     * 微信小程序登录
     * @param userLoginDTO 用户登录信息
     * @return 用户信息
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        log.info("微信小程序登录");
        String openid = getOpenid(userLoginDTO.getCode());
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //3. 根据openid查询用户信息，不存在则新增用户（针对外卖系统来说，不是微信）
        User user =  userMapper.getByOpenid(openid);
        if(user == null){
            user = new User();
            user.setOpenid(openid);
            user.setCreateTime(LocalDateTime.now());
            userMapper.insert(user);
        }
        //4. 返回用户信息
        return user;
    }


    /**
     * 获取openid
     * @param code 微信登录凭证
     * @return openid
     */
    private String getOpenid(String code) {
        //1. 调用微信接口获取用户信息 获取openid
        HashMap<String,String> map = new HashMap<>();
        map.put("appid",wxProperties.getAppid());
        map.put("secret",wxProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");
        String json = null;
        try {
           json =  HttpClientUtil.doGet(WX_LOGIN_URL,map   );
        } catch (URISyntaxException | IOException e) {
            log.error("请求失败", e);
            throw new RuntimeException(e);
        }
        //2. 判断openid是否存在，不存在则抛出异常
        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }
}