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

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