MappedServletFactory.java 文件源码

public MappedServlet toMappedServlet(Servlet servlet) {

        WebServlet wsAnnotation = servlet.getClass().getAnnotation(WebServlet.class);

        if (wsAnnotation == null) {
            throw new IllegalArgumentException(
                    "Servlet contains no @WebServlet annotation and can not be mapped directly. Wrap it in a MappedServlet instead.");
        }

        String name = wsAnnotation.name() != null && wsAnnotation.name().length() > 0 ? wsAnnotation.name() : null;
        Set<String> urlPatterns = new HashSet<>(asList(wsAnnotation.urlPatterns()));

        Map<String, String> initParams = new HashMap<>();

        WebInitParam[] paramsArray = wsAnnotation.initParams();
        if (paramsArray != null) {
            asList(paramsArray).forEach(p -> initParams.put(p.name(), p.value()));
        }

        return new MappedServlet(servlet, urlPatterns, name, initParams);
    }