<dependency>
    <groupId>com.github.binarywang</groupId>
    <artifactId>weixin-java-tools</artifactId>
    <version>3.5.0</version>
</dependency>

wx.appid=your_appidwx.appsecret=your_appsecret

@RestController
public class WechatController {
 
    @Autowired
    private WxMpService wxService;
 
    @GetMapping("/login")
    public String login(@RequestParam("code") String code) throws WxErrorException {
        WxMpOAuth2AccessToken accessToken = wxService.oauth2getAccessToken(code);
        String openid = accessToken.getOpenId();
        // TODO: 處理用戶登錄邏輯
        return "openid: " + openid;
    }
 
    @GetMapping("/authorize")
    public String authorize() throws WxErrorException {
        String redirectUrl = "http://your_domain.com/login";
        String url = wxService.oauth2buildAuthorizationUrl(redirectUrl, WxConsts.OAuth2Scope.SNSAPI_USERINFO, null);
        return "redirect:" + url;
    }
}

@SpringBootApplication
public class Application {
 
    @Value("${wx.appid}")
    private String appId;
 
    @Value("${wx.appsecret}")
    private String appSecret;
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
 
    @Bean
    public WxMpService wxMpService() {
        WxMpService wxMpService = new WxMpServiceImpl();
        WxMpDefaultConfigImpl config = new WxMpDefaultConfigImpl();
        config.setAppId(appId);
        config.setSecret(appSecret);
        wxMpService.setWxMpConfigStorage(config);
        return wxMpService;
    }
}

<a href="/authorize" rel="external nofollow" >微信登錄</a>