Java resteasy 中的预匹配过滤器

Question

我有一个这样的代码块。但它似乎没有找到在@Path("resource-name") 中指定了小写 url 的资源方法。如何在资源或控制器上的方法匹配之前应用此过滤器？

public class LowerCaseRequestFilter implements Filter {

    @Inject
    public LowerCaseRequestFilter() {
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(@Nonnull ServletRequest servletRequest, @Nonnull ServletResponse servletResponse, @Nonnull FilterChain filterChain) throws IOException, ServletException {

        final HttpServletRequest req = (HttpServletRequest) servletRequest;
        final String requestUrl = req.getRequestURI();
        final String newUrl = requestUrl.toLowerCase();
        req.getRequestDispatcher(newUrl).forward(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }

Answer 1

如果您使用的是 JAX-RS 2，则可以使用 @PreMatching ContainerRequestFilter：

@Provider
@PreMatching
public class LowerCaseFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        String newUri = requestContext.getUriInfo().getRequestUri().toString().toLowerCase();
        requestContext.setRequestUri(URI.create(newUri));
    }

}