手把手教你如何获取微信用户openid

natapp -authtoken 你的authtoken

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author ：小肖
 * @date ：Created in 2022/2/1 21:55
 */
@RestController
@RequestMapping("/weixin")
@Slf4j
public class WeixinController {

    @GetMapping("/auth")
    public void auth(@RequestParam("code") String code){
        log.info("进入了auth方法...");
        log.info("code = {}",code);
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * @author ：小肖
 * @date ：Created in 2022/2/1 21:55
 */
@RestController
@RequestMapping("/weixin")
@Slf4j
public class WeixinController {

    @GetMapping("/auth")
    public void auth(@RequestParam("code") String code){
        log.info("进入了auth方法...");
        log.info("code = {}",code);
        String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=appid&secret=appsecret&code=" + code + "&grant_type=authorization_code";
        RestTemplate restTemplate = new RestTemplate();
        String response = restTemplate.getForObject(url, String.class);
    }
}

{
  "access_token": "53_HK355v2MhOolNlGkaoUf4oDCkyX0WDollvsQNU5SvhsvmvF2S2VoqdPXuokfERI2oqFvQijVShq8aQzeQ9n01mGKSJn7q5rLAcYbTjm1H7k",
  "expires_in": 7200,
  "refresh_token": "53_C1us_G770mgzXjd-PuK329qB65lXiK483_qxUXjKudwWIdHkOz5ntwlByEgUQfMEy_-7tCCzcO4DoHaFbY0JurpZYD3Bys6DLs8ua8J_CjU",
  "openid": "你的openid",
  "scope": "snsapi_base"
}

        <!--微信公众号开发需要引入的依赖-->
        <dependency>
            <groupId>com.github.binarywang</groupId>
            <artifactId>weixin-java-mp</artifactId>
            <version>3.1.0</version>
        </dependency>

wechat:
  mpAppId: 你的微信测试号appId
  mpAppSecret: 你的微信测试号secret

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * @author ：小肖
 * @date ：Created in 2022/2/2 10:31
 */
@Component
@Data
@ConfigurationProperties(prefix = "wechat")
public class WechatAccountConfig {

    /**
     * 公众号id
     */
    private String mpAppId;

    /**
     * 公众号密钥
     */
    private String mpAppSecret;

}

import me.chanjar.weixin.mp.api.WxMpConfigStorage;
import me.chanjar.weixin.mp.api.WxMpInMemoryConfigStorage;
import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

/**
 * @author ：小肖
 * @date ：Created in 2022/2/2 10:24
 */
@Component
public class WechatMpConfig {


    @Autowired
    private WechatAccountConfig wechatAccountConfig;

    @Autowired
    private WxMpInMemoryConfigStorage wxMpInMemoryConfigStorage;

    @Bean
    public WxMpService wxMpService(){
        WxMpService wxMpService = new WxMpServiceImpl();
        wxMpService.setWxMpConfigStorage(wxMpInMemoryConfigStorage);
        return wxMpService;
    }

    @Bean
    public WxMpInMemoryConfigStorage wxMpConfigStorage(){
        /**
         * 这里需要注意的是 由于父类中没有定义对应的接口
         * 所以所有的方法都在其实现类中，所以我们要构造实现类
         */
        WxMpInMemoryConfigStorage wxMpConfigStorage = new WxMpInMemoryConfigStorage();
        wxMpConfigStorage.setAppId(wechatAccountConfig.getMpAppId());
        wxMpConfigStorage.setSecret(wechatAccountConfig.getMpAppSecret());
        return wxMpConfigStorage;
    }
}

import com.xiao.enums.ResultEnum;
import com.xiao.exception.SellException;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.api.WxConsts;
import me.chanjar.weixin.common.error.WxErrorException;
import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.bean.result.WxMpOAuth2AccessToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author ：小肖
 * @date ：Created in 2022/2/2 10:20
 */
@Controller
@RequestMapping("/wechat")
@Slf4j
public class WechatController {

    @Autowired
    private WxMpService wxMpService;

    @GetMapping("/authorize")
    public String authorize(@RequestParam("returnUrl") String returnUrl){
        String url = "http://xiao-sell.natapp1.cc/sell/wechat/userInfo";
        String redirectUrl = wxMpService.oauth2buildAuthorizationUrl(url, WxConsts.OAuth2Scope.SNSAPI_USERINFO,returnUrl);
        return "redirect:" +  redirectUrl;
    }

    @GetMapping("/userInfo")
    public String userInfo(@RequestParam("code") String code,
                         @RequestParam("state") String returnUrl) {
        WxMpOAuth2AccessToken wxMpOAuth2AccessToken = new WxMpOAuth2AccessToken();
        try{
            wxMpOAuth2AccessToken = wxMpService.oauth2getAccessToken(code);
        }catch (WxErrorException e){
            log.error("【微信网页授权错误】 exception = {}",e);
            throw new SellException(ResultEnum.WECHAT_MP_ERROR.getCode(),e.getError().getErrorMsg());
        }
        String openId = wxMpOAuth2AccessToken.getOpenId();
        log.info("openid = {}",openId);
        return "redirect:" + returnUrl + "?openid=" + openId;
    }
}