本文整理了Java中java.util.stream.Stream.map()方法的一些代码示例，展示了Stream.map()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.map()方法的具体详情如下：
包路径：java.util.stream.Stream
类名称：Stream
方法名：map

Stream.map介绍

[英]Returns a DoubleStream consisting of the results of applying the given function to the elements of this stream.

This is an intermediate operation.
[中]返回一个DoubleStream，其中包含将给定函数应用于该流元素的结果。
这是一个intermediate operation。

代码示例

canonical example by Tabnine

public void printFibonacciSequence(int length) {
 System.out.println(
   Stream.iterate(new long[] {0, 1}, pair -> new long[] {pair[1], pair[0] + pair[1]})
     .limit(length)
     .map(pair -> Long.toString(pair[1]))
     .collect(Collectors.joining(", ")));
}

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

/**
 * Re-create the given mime types as media types.
 * @since 5.0
 */
public static List<MediaType> asMediaTypes(List<MimeType> mimeTypes) {
  return mimeTypes.stream().map(MediaType::asMediaType).collect(Collectors.toList());
}

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

@Override
public Set<String> keySet() {
  return this.headers.getHeaderNames().stream()
      .map(HttpString::toString)
      .collect(Collectors.toSet());
}

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

private String formatMappings(Class<?> userType, Map<Method, T> methods) {
  String formattedType = Arrays.stream(ClassUtils.getPackageName(userType).split("\\."))
      .map(p -> p.substring(0, 1))
      .collect(Collectors.joining(".", "", ".")) + userType.getSimpleName();
  Function<Method, String> methodFormatter = method -> Arrays.stream(method.getParameterTypes())
      .map(Class::getSimpleName)
      .collect(Collectors.joining(",", "(", ")"));
  return methods.entrySet().stream()
      .map(e -> {
        Method method = e.getKey();
        return e.getValue() + ": " + method.getName() + methodFormatter.apply(method);
      })
      .collect(Collectors.joining("\n\t", "\n\t" + formattedType + ":" + "\n\t", ""));
}

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

/**
 * Helps to format HTTP header values, as HTTP header values themselves can
 * contain comma-separated values, can become confusing with regular
 * {@link Map} formatting that also uses commas between entries.
 * @param headers the headers to format
 * @return the headers to a String
 * @since 5.1.4
 */
public static String formatHeaders(MultiValueMap<String, String> headers) {
  return headers.entrySet().stream()
      .map(entry -> {
        List<String> values = entry.getValue();
        return entry.getKey() + ":" + (values.size() == 1 ?
            "\"" + values.get(0) + "\"" :
            values.stream().map(s -> "\"" + s + "\"").collect(Collectors.joining(", ")));
      })
      .collect(Collectors.joining(", ", "[", "]"));
}

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: 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
@Nullable
public CorsConfiguration getCorsConfiguration(ServerWebExchange exchange) {
  PathContainer lookupPath = exchange.getRequest().getPath().pathWithinApplication();
  return this.corsConfigurations.entrySet().stream()
      .filter(entry -> entry.getKey().matches(lookupPath))
      .map(Map.Entry::getValue)
      .findFirst()
      .orElse(null);
}

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

@Override
public boolean containsValue(Object value) {
  return (value instanceof String &&
      this.headers.getHeaderNames().stream()
          .map(this.headers::get)
          .anyMatch(values -> values.contains(value)));
}

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

/**
 * Return all registered interceptors.
 */
protected List<Object> getInterceptors() {
  return this.registrations.stream()
      .sorted(INTERCEPTOR_ORDER_COMPARATOR)
      .map(InterceptorRegistration::getInterceptor)
      .collect(Collectors.toList());
}

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

private String formatMappings(Class<?> userType, Map<Method, T> methods) {
  String formattedType = Arrays.stream(ClassUtils.getPackageName(userType).split("\\."))
      .map(p -> p.substring(0, 1))
      .collect(Collectors.joining(".", "", ".")) + userType.getSimpleName();
  Function<Method, String> methodFormatter = method -> Arrays.stream(method.getParameterTypes())
      .map(Class::getSimpleName)
      .collect(Collectors.joining(",", "(", ")"));
  return methods.entrySet().stream()
      .map(e -> {
        Method method = e.getKey();
        return e.getValue() + ": " + method.getName() + methodFormatter.apply(method);
      })
      .collect(Collectors.joining("\n\t", "\n\t" + formattedType + ":" + "\n\t", ""));
}

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

private void assertDecoderInstance(Decoder<?> decoder) {
  assertSame(decoder, this.configurer.getReaders().stream()
      .filter(writer -> writer instanceof DecoderHttpMessageReader)
      .map(writer -> ((DecoderHttpMessageReader<?>) writer).getDecoder())
      .filter(e -> decoder.getClass().equals(e.getClass()))
      .findFirst()
      .filter(e -> e == decoder).orElse(null));
}

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

/**
 * Return declared HTTP methods.
 */
public Set<HttpMethod> getAllowedMethods() {
  return this.partialMatches.stream().
      flatMap(m -> m.getInfo().getMethodsCondition().getMethods().stream()).
      map(requestMethod -> HttpMethod.resolve(requestMethod.name())).
      collect(Collectors.toSet());
}

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

@Nullable
private String getContentCodingKey(ServerWebExchange exchange) {
  String header = exchange.getRequest().getHeaders().getFirst("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: 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

private int countAnnotatedMethods(Class<? extends Annotation> annotationType) {
  return (int) Arrays.stream(this.testClasses)
      .map(ReflectionUtils::getUniqueDeclaredMethods)
      .flatMap(Arrays::stream)
      .filter(method -> hasAnnotation(method, annotationType))
      .count();
}

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

@Override
protected void applyCookies() {
  getCookies().values().stream().flatMap(Collection::stream)
      .map(cookie -> new DefaultCookie(cookie.getName(), cookie.getValue()))
      .forEach(this.request::addCookie);
}

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

@Nullable
private <T> T createSingleBean(Function<WebFluxConfigurer, T> factory, Class<T> beanType) {
  List<T> result = this.delegates.stream().map(factory).filter(Objects::nonNull).collect(Collectors.toList());
  if (result.isEmpty()) {
    return null;
  }
  else if (result.size() == 1) {
    return result.get(0);
  }
  else {
    throw new IllegalStateException("More than one WebFluxConfigurer implements " +
        beanType.getSimpleName() + " factory method.");
  }
}