Java 将对象从API资源方法传递到APIFilter后检查方法

我有一个用例，对于所有的PUT/Delete/Update调用，我想发送一些对象到ApiFilter的PostCheck进行一些处理

我试着这样做：

@Context
HttpServletRequest request;
@Context
ContainerResponseContext responseContext ;
@PUT
@Path("/snmp")
@Produces(MediaType.APPLICATION_JSON)
@Timed

public Response<List<SNMPSettingsFactory.ExternalSNMPSettings>> updateSNMPTargetSettingsList(
        @Nonnull SNMPSettingsFactory.ExternalSNMPSettings externalSNMPSettings)
   {
     request.setAttribute("old",oldSettingObject);
     request.setAttribute("new",currentSettingObject);

---

请帮助我如何将所有API调用的对象传递给postfilter，以执行一些常见的处理，如查找差异并记录它。

您可以将ContainerRequestContext注入资源并使用

setProperty（）

。用户可以使用

getProperty（）

检索它。您已经在使用

HttpServletRequest#setAttribute（）

执行类似的操作。当我用getAttribute（）获取它时，您可以用

getAttribute（）检索它，它的值为null。什么是null？你同意NullPointerException吗？HttpServletRequst是否为空？
@Provider
public class ApiFilter implements ContainerRequestFilter, 
ContainerResponseFilter {

private final ApiNonFunctionalHandler handler;
private final Logger logger = LoggerFactory.getLogger(ApiFilter.class);
public ApiFilter(ApiNonFunctionalHandler handler) {
    this.handler = handler;
}

@Context
HttpServletRequest request;
@Override
public void filter(ContainerRequestContext requestContext) throws IOException {
    try {
        String urlPath = requestContext.getUriInfo().getRequestUri().getPath();
        if (!urlPath.startsWith(ApiConstants.BASE_URL)) {
            return;
        }
        UserInfo userInfo;
        String authorization = NullOrEmpty.isFalse(requestContext.getHeaderString(CspClient.AUTH_TOKEN_HEADER))?
                requestContext.getHeaderString(CspClient.AUTH_TOKEN_HEADER) : requestContext.getHeaderString("Authorization");
        userInfo = handler.preCheck(ApiUtils.getApiCategory(urlPath),
                authorization, isAuthRequired(urlPath, requestContext.getMethod()));
        requestContext.setSecurityContext(new CustomSecurityContext(userInfo,""));


    } catch (RuntimeException e) {
        throw Throwables.propagate(e);
    } catch (Exception e) {
        throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR);
    }
}

@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws
        IOException {

    String urlPath = requestContext.getUriInfo().getRequestUri().getPath();

    String callerIpAddress = null;
    if (request != null) {
        callerIpAddress = request.getRemoteAddr();
    }

    String callerUserName = null;
    if (request != null) {
        callerUserName = request.getRemoteUser();
    }

    Object oldObject = request.getAttribute("old");
    Object currentObject = request.getAttribute("new");