无法为spring boot 2应用程序中的拦截器添加配置WebMvcConfigurer

Question

我试图在我的spring boot应用程序中首次创建一个拦截器，但不知何故，它不是自动创建的，如教程中所述。

我试图创建一个WebConfig类来扩展WebMvcConfigurerAdapter类，并将其注释为@Component，但没有成功。我还试图创建一个WebConfig，用@configuration和@enableWebMVC注释实现WebMvcConfigurer接口，但也没有成功。

@Configuration
@EnableWebMvc
@ComponentScan("com.*")
public class WebConfig implements WebMvcConfigurer {


    public WebConfig() {
        super();
    }

    @Autowired
    HandlerInterceptor headerModifierInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        System.out.println("------------------hi");
        registry.addInterceptor(headerModifierInterceptor);
    }

}

@SpringBootApplication
@EnableWebSecurity
@ComponentScan(basePackages = {"com.*"})
@EntityScan("com")
public class CoreRestAPIApplication {

    public static void main(String[] args) {

        SpringApplication.run(CoreRestAPIApplication.class, args);

    }
}

我的拦截器类：

@Component
public class RestTemplateHeaderModifierInterceptor
        implements HandlerInterceptor {

    @Autowired
    AuthUtil authUtil;

    @Autowired
    JwtTokenProvider jwtTokenProvider;

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        String resolvedToken = jwtTokenProvider.resolveToken(request);
        if (!StringUtils.isEmpty(resolvedToken)) {
            String updatedToken = jwtTokenProvider.createToken(jwtTokenProvider.getUsername(resolvedToken), jwtTokenProvider.getAuthentication(resolvedToken).getAuthorities());
            response.addHeader(authUtil.AUTH_HEADER_NAME, updatedToken);
        }
    }
}

Answer 1

经过一些搜索，我发现我有一个注册的WebMvcConfigurationSupport配置。但是，如果有人希望使用拦截器修改头部，不要使用拦截器，因为如果您返回ResponseEntity或您的控制器方法返回@ResponseBody，spring不会很好地处理它。取而代之的是（至少对于我来说是在每次收到有效请求时过滤和更新令牌），使用doFilterInternal方法将标头添加到响应中（或者如果愿意的话添加cookie..）下面是我是如何做到这一点的一个例子：

public class JwtTokenFilter extends OncePerRequestFilter {

  private JwtTokenProvider jwtTokenProvider;

  public JwtTokenFilter(JwtTokenProvider jwtTokenProvider) {
    this.jwtTokenProvider = jwtTokenProvider;
  }

  @Override
  protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
    String token = jwtTokenProvider.resolveToken(httpServletRequest);
    try {
      if (token != null && jwtTokenProvider.validateToken(token)) {
        Authentication auth = jwtTokenProvider.getAuthentication(token);
        SecurityContextHolder.getContext().setAuthentication(auth);
        if(!jwtTokenProvider.isExpired(token)) {
          httpServletResponse.setHeader("authKey", jwtTokenProvider.createToken(jwtTokenProvider.getUsername(token), auth.getAuthorities()));
        }
      }
    } catch (ClientErrorException ex) {
      //this is very important, since it guarantees the models is not authenticated at all
      SecurityContextHolder.clearContext();
      httpServletResponse.sendError(ex.getStatus().value(), ex.getMessage());
      return;
    }

    filterChain.doFilter(httpServletRequest, httpServletResponse);
  }

}