@Context注入无法在Jersey ContainerRequestFilter（Dropwizard）中工作

Question

@Context注入适用于类，但不能使它与Objects一起使用。

ContainerRequestFilter中的

httpServletRequest生成空指针。

Dropwizard版本： - 1.1.0

ContainerRequestFilter

public class ApplicationIPAuthFilter implements ContainerRequestFilter {

    private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationIPAuthFilter.class);
    private HerculesRestAccessor restAccessor;
    private String applicationName;

    @Context
    private HttpServletRequest httpServletRequest;

    public ApplicationIPAuthFilter(){
    }

    public ApplicationIPAuthFilter(HerculesRestAccessor accessor, String applicationName) {
        restAccessor = accessor;
        this.applicationName = applicationName;
    }

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        // need remote Ip
        String remoteIp = this.httpServletRequest.getRemoteAddr();
        ....
    }
}

DynamicFeature

@Provider
public class ApplicationIPAuthFeature implements DynamicFeature {

    private final HerculesRestAccessor accessor;
    private final String applicationName;

    public ApplicationIPAuthFeature(HerculesRestAccessor accessor, String applicationName) {

        this.accessor = accessor;
        this.applicationName = applicationName;
    }

    @Override
    public void configure(ResourceInfo resourceInfo, FeatureContext context) {
        if (resourceInfo.getResourceMethod().getAnnotation(ApplicationIPAuthRequired.class) != null) {

            // not working
            context.register(new ApplicationIPAuthFilter(accessor, applicationName));

             //@Context injection works in ContainerRequestFilter for classes
            //context.register(ApplicationIPAuthFilter.class);
        }
    }
}

我试图在ContainerRequestFilter中获取远程ip，以基于ip验证请求。

如何解决这个问题..需要帮助吗？

Answer 1

It's a known issue with DynamicFeature。注册作为对象时，注射不起作用。

您可以做的一件事就是手动注入它，就像this post中提到的那样。

您可以做的另一件事是使HerculesRestAccessor和applicationName注射。或者更确切地说，使应用程序名称可注入，您可以将其设置为配置属性inject the configuration。如果这样做，那么您可以将过滤器注册为一个类，并且所有注入都应该有效。