javax.servlet.annotation.WebFilter#initParams ( )源码实例Demo

private void addFilter(ServletContextHandler context, Class clso, WebFilter anno) {
    DispatcherType[]  ds = anno.dispatcherTypes(  );
    List   <DispatcherType> ls = Arrays .asList(ds);
    EnumSet<DispatcherType> es = EnumSet.copyOf(ls);

    FilterHolder  hd = new FilterHolder (clso );
    hd.setName          (anno.filterName(    ));
    hd.setAsyncSupported(anno.asyncSupported());

    for(WebInitParam nv : anno.initParams ()) {
        hd.setInitParameter(nv.name( ), nv.value());
    }

    for(String       ur : anno.urlPatterns()) {
        context.addFilter (hd, ur, es);
    }
}
 

private void configure(final ServletEnvironment environment, final Filter filter,
                       final String name, final WebFilter annotation) {
    final FilterRegistration.Dynamic mapping = environment.addFilter(name, filter);
    final EnumSet<DispatcherType> dispatcherTypes = EnumSet.copyOf(Arrays.asList(annotation.dispatcherTypes()));
    if (annotation.servletNames().length > 0) {
        mapping.addMappingForServletNames(dispatcherTypes, false, annotation.servletNames());
    } else {
        final String[] urlPatterns = annotation.urlPatterns().length > 0
                ? annotation.urlPatterns() : annotation.value();
        mapping.addMappingForUrlPatterns(dispatcherTypes, false, urlPatterns);
    }
    if (annotation.initParams().length > 0) {
        for (WebInitParam param : annotation.initParams()) {
            mapping.setInitParameter(param.name(), param.value());
        }
    }
    mapping.setAsyncSupported(annotation.asyncSupported());
}
 

private Map<String, String> readAnnotatedInitParams() {
    Map<String, String> initParams = new HashMap<>();
    if (isAnnotated()) {
        WebFilter regAnnotation = filter.getClass().getAnnotation(WebFilter.class);
        for (WebInitParam param : regAnnotation.initParams()) {
            initParams.put(param.name(), param.value());
        }
    }

    return initParams;
}
 

private void processFilters() {
    Consumer<Class<? extends Filter>> c = filter -> {
        WebFilter webFilter = ClassUtils.getAnnotation(filter, WebFilter.class);
        if(webFilter != null) {
            FilterDescriptor filterDescriptor = new FilterDescriptor(webFilter.filterName(),
                    webFilter.value(), mapUrls(webFilter.urlPatterns()), webFilter.dispatcherTypes(),
                    webFilter.initParams(), webFilter.asyncSupported(), webFilter.servletNames(),
                    filter);
            webServer.addFilter(filterDescriptor);
        }
    };
    extension.processFilters(c);
}