本文整理了Java中java.util.stream.Stream.filter()方法的一些代码示例，展示了Stream.filter()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Stream.filter()方法的具体详情如下：
包路径：java.util.stream.Stream
类名称：Stream
方法名：filter

Stream.filter介绍

[英]Returns a stream consisting of the elements of this stream that match the given predicate.

This is an intermediate operation.
[中]返回一个流，该流包含与给定谓词匹配的该流元素。
这是一个intermediate operation。

代码示例

canonical example by Tabnine

public List<Integer> findDivisors(int number) {
 return Stream.iterate(1, k -> ++k)
   .limit(number)
   .filter(k -> number % k == 0)
   .collect(Collectors.toList());
}

代码示例来源：origin: apache/incubator-dubbo

private <T> List<Invoker<T>> filterInvoker(List<Invoker<T>> invokers, Predicate<Invoker<T>> predicate) {
  return invokers.stream()
      .filter(predicate)
      .collect(Collectors.toList());
}

代码示例来源：origin: spring-projects/spring-framework

@Nullable
private static MediaType initDefaultMediaType(List<MediaType> mediaTypes) {
  return mediaTypes.stream().filter(MediaType::isConcrete).findFirst().orElse(null);
}

代码示例来源：origin: apache/incubator-dubbo

/**
 * Return method model for the given method on consumer side
 *
 * @param method method object
 * @return method model
 */
public ConsumerMethodModel getMethodModel(String method) {
  Optional<Map.Entry<Method, ConsumerMethodModel>> consumerMethodModelEntry = methodModels.entrySet().stream().filter(entry -> entry.getKey().getName().equals(method)).findFirst();
  return consumerMethodModelEntry.map(Map.Entry::getValue).orElse(null);
}

代码示例来源：origin: prestodb/presto

private static <T> Set<T> intersect(Set<T> set1, Set<T> set2)
{
  return set1.stream()
      .filter(set2::contains)
      .collect(toSet());
}

代码示例来源：origin: spring-projects/spring-framework

private static <T, S extends Publisher<T>> S readWithMessageReaders(
    ReactiveHttpInputMessage message, BodyExtractor.Context context, ResolvableType elementType,
    Function<HttpMessageReader<T>, S> readerFunction,
    Function<UnsupportedMediaTypeException, S> errorFunction,
    Supplier<S> emptySupplier) {
  if (VOID_TYPE.equals(elementType)) {
    return emptySupplier.get();
  }
  MediaType contentType = Optional.ofNullable(message.getHeaders().getContentType())
      .orElse(MediaType.APPLICATION_OCTET_STREAM);
  return context.messageReaders().stream()
      .filter(reader -> reader.canRead(elementType, contentType))
      .findFirst()
      .map(BodyExtractors::<T>cast)
      .map(readerFunction)
      .orElseGet(() -> {
        List<MediaType> mediaTypes = context.messageReaders().stream()
            .flatMap(reader -> reader.getReadableMediaTypes().stream())
            .collect(Collectors.toList());
        return errorFunction.apply(
            new UnsupportedMediaTypeException(contentType, mediaTypes, elementType));
      });
}

代码示例来源：origin: spring-projects/spring-framework

@Nullable
private String getContentCodingKey(HttpServletRequest request) {
  String header = request.getHeader(HttpHeaders.ACCEPT_ENCODING);
  if (!StringUtils.hasText(header)) {
    return null;
  }
  return Arrays.stream(StringUtils.tokenizeToStringArray(header, ","))
      .map(token -> {
        int index = token.indexOf(';');
        return (index >= 0 ? token.substring(0, index) : token).trim().toLowerCase();
      })
      .filter(this.contentCodings::contains)
      .sorted()
      .collect(Collectors.joining(","));
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Return declared "producible" types but only among those that also
 * match the "methods" and "consumes" conditions.
 */
public Set<MediaType> getProducibleMediaTypes() {
  return this.partialMatches.stream().filter(PartialMatch::hasConsumesMatch).
      flatMap(m -> m.getInfo().getProducesCondition().getProducibleMediaTypes().stream()).
      collect(Collectors.toCollection(LinkedHashSet::new));
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Provide the TaskScheduler to use for SockJS endpoints for which a task
 * scheduler has not been explicitly registered. This method must be called
 * prior to {@link #getHandlerMapping()}.
 */
protected void setTaskScheduler(TaskScheduler scheduler) {
  this.registrations.stream()
      .map(ServletWebSocketHandlerRegistration::getSockJsServiceRegistration)
      .filter(Objects::nonNull)
      .filter(r -> r.getTaskScheduler() == null)
      .forEach(registration -> registration.setTaskScheduler(scheduler));
}

代码示例来源：origin: spring-projects/spring-framework

/**
 * Get all methods in the supplied {@link Class class} and its superclasses
 * which are annotated with the supplied {@code annotationType} but
 * which are not <em>shadowed</em> by methods overridden in subclasses.
 * <p>Default methods on interfaces are also detected.
 * @param clazz the class for which to retrieve the annotated methods
 * @param annotationType the annotation type for which to search
 * @return all annotated methods in the supplied class and its superclasses
 * as well as annotated interface default methods
 */
private List<Method> getAnnotatedMethods(Class<?> clazz, Class<? extends Annotation> annotationType) {
  return Arrays.stream(ReflectionUtils.getUniqueDeclaredMethods(clazz))
      .filter(method -> AnnotatedElementUtils.hasAnnotation(method, annotationType))
      .collect(Collectors.toList());
}

代码示例来源：origin: spring-projects/spring-framework

private static <T> HttpMessageWriter<T> findWriter(
    BodyInserter.Context context, ResolvableType elementType, @Nullable MediaType mediaType) {
  return context.messageWriters().stream()
      .filter(messageWriter -> messageWriter.canWrite(elementType, mediaType))
      .findFirst()
      .map(BodyInserters::<T>cast)
      .orElseThrow(() -> new IllegalStateException(
          "No HttpMessageWriter for \"" + mediaType + "\" and \"" + elementType + "\""));
}

代码示例来源：origin: jenkinsci/jenkins

private @Nonnull Optional<SingleTokenStats> findById(@Nonnull String tokenUuid) {
  return tokenStats.stream()
      .filter(s -> s.tokenUuid.equals(tokenUuid))
      .findFirst();
}

代码示例来源：origin: apache/incubator-dubbo

public static int getConsumerAddressNum(String serviceUniqueName) {
    Set<ConsumerInvokerWrapper> providerInvokerWrapperSet = ProviderConsumerRegTable.getConsumerInvoker(serviceUniqueName);
    return providerInvokerWrapperSet.stream()
        .map(w -> w.getRegistryDirectory().getUrlInvokerMap())
        .filter(Objects::nonNull)
        .mapToInt(Map::size).sum();
  }
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public Stream<T> stream() {
  return Arrays.stream(getBeanNamesForTypedStream(requiredType))
      .map(name -> (T) getBean(name))
      .filter(bean -> !(bean instanceof NullBean));
}
@Override

代码示例来源：origin: spring-projects/spring-framework

private Mono<Map<String, Object>> initAttributes(ServerWebExchange exchange) {
  if (this.sessionAttributePredicate == null) {
    return EMPTY_ATTRIBUTES;
  }
  return exchange.getSession().map(session ->
      session.getAttributes().entrySet().stream()
          .filter(entry -> this.sessionAttributePredicate.test(entry.getKey()))
          .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
}

代码示例来源：origin: spring-projects/spring-framework

private static Method getMethodForReturnType(Class<?> returnType) {
  return Arrays.stream(TestBean.class.getMethods())
      .filter(method -> method.getReturnType().equals(returnType))
      .findFirst()
      .orElseThrow(() ->
          new IllegalArgumentException("Unique return type not found: " + returnType));
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response) {
  // Remove underlying context path first (e.g. Servlet container)
  String path = request.getPath().pathWithinApplication().value();
  return this.handlerMap.entrySet().stream()
      .filter(entry -> path.startsWith(entry.getKey()))
      .findFirst()
      .map(entry -> {
        String contextPath = request.getPath().contextPath().value() + entry.getKey();
        ServerHttpRequest newRequest = request.mutate().contextPath(contextPath).build();
        return entry.getValue().handle(newRequest, response);
      })
      .orElseGet(() -> {
        response.setStatusCode(HttpStatus.NOT_FOUND);
        return response.setComplete();
      });
}

代码示例来源：origin: apache/kafka

private KafkaMetric getMetric(String name) throws Exception {
    Optional<Map.Entry<MetricName, KafkaMetric>> metric = metrics.metrics().entrySet().stream()
        .filter(entry -> entry.getKey().name().equals(name))
        .findFirst();
    if (!metric.isPresent())
      throw new Exception(String.format("Could not find metric called %s", name));

    return metric.get().getValue();
  }
}

代码示例来源：origin: apache/incubator-dubbo

private <T> List<Invoker<T>> filterInvoker(List<Invoker<T>> invokers, Predicate<Invoker<T>> predicate) {
  return invokers.stream()
      .filter(predicate)
      .collect(Collectors.toList());
}

代码示例来源：origin: spring-projects/spring-framework

private static Log initLogger(List<Log> loggers, Predicate<Log> predicate) {
  return loggers.stream().filter(predicate).findFirst().orElse(NO_OP_LOG);
}