SpringBoot JWT Token 跨域 Preflight response is not successful

一、Springboot实现token校验

SpringBoot实现token校验，可以通过Filter或者HandlerInterceptor，两种方式都可以，Filter在最外层，请求首先会通过Filter，filter允许请求才会通过Intercept。

下面以HandlerInterceptor实现为例

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1.实现HandlerInterceptor，拦截请求校验token

public class AuthenticationInterceptor implements HandlerInterceptor {
    private static final String URI_PASS_TOKEN = "/user/login";

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        log.info("authentication interceptor preHandle  path:{} uri:{}",httpServletRequest.getServletPath(),httpServletRequest.getRequestURI());

//        if ("OPTIONS".equalsIgnoreCase(httpServletRequest.getMethod())) {
//            return true;
//        }

        if (httpServletRequest.getRequestURI().endsWith(URI_PASS_TOKEN)) {
            return true;
        }
        //从http header里面获取token
        String token = httpServletRequest.getHeader("token");
        if (StringUtils.isEmpty(token)) {
            throw new AuthenticationException(CODE_AUTHENTICATION_FAILED,"token is empty");
        }

        Algorithm algorithm = Algorithm.HMAC256(JwtConstant.TOKEN_CREATE_SECRET);
        JWTVerifier verifier = JWT.require(algorithm).build();
        try {
            verifier.verify(token);
        }catch (Exception ex){
            throw new AuthenticationException(CODE_AUTHENTICATION_FAILED,ex.getMessage());
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

2.Configuration配置，实现自动注入

@Configuration
public class InterceptorConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(authenticationInterceptor())
                .addPathPatterns("/**");
    }

    @Bean
    public AuthenticationInterceptor authenticationInterceptor() {
        return new AuthenticationInterceptor();
    }
}

二、前端调用 跨域 Preflight response is not successful

通过单元测试、PostMan测试都可以调同，但是vue前端怎么都无法调用，错误如下：

参考https://segmentfault.com/a/11...
发现是浏览器发出的OPTIONS预检请求被HandlerInterceptor拦截了，因此在HandlerInterceptor添加如下代码：

        if ("OPTIONS".equalsIgnoreCase(httpServletRequest.getMethod())) {
            return true;
        }

对于options的请求不进行token检测即可