private <T> String join(final @NonNull List<T> list, final Function<T, String> mapper) {
        return list.stream()
                .map(mapper)
                .collect(Collectors.joining("-"));
    }
The type Dubbo multi param service.
shenyu-examples/shenyu-examples-dubbo/shenyu-examples-apache-dubbo-service/src/main/java/org/apache/shenyu/examples/apache/dubbo/service/impl/DubboMultiParamServiceImpl.java