设置WebClient.Builder.exchangeStrategies（）而不丢失Spring Jackson配置

小编典典

设置WebClient.Builder.exchangeStrategies（）而不丢失Spring Jackson配置

spring-boot

我正在使用以下代码来配置要在WebClient请求上记录的标头：

ExchangeStrategies exchangeStrategies = ExchangeStrategies.withDefaults();
exchangeStrategies
    .messageWriters().stream()
    .filter(LoggingCodecSupport.class::isInstance)
    .forEach(writer -> ((LoggingCodecSupport)writer).setEnableLoggingRequestDetails(true));

client = WebClient.builder()
    .exchangeStrategies(exchangeStrategies)

这可行，但是会导致我的Jackson配置丢失。在我的application.properties中，我有：

spring.jackson.default-property-inclusion=non-null
spring.jackson.deserialization.accept-empty-string-as-null-object=true

被上面的代码覆盖。这是我的解决方法：

  @Autowired ObjectMapper objectMapper;

  @Bean
  WebClientCustomizer webClientCustomizer() {
    return (WebClient.Builder builder) -> {
      builder
          .exchangeStrategies(createExchangeStrategiesWhichLogHeaders())
    };
  }

  private ExchangeStrategies createExchangeStrategiesWhichLogHeaders() {
    ExchangeStrategies exchangeStrategies =
        ExchangeStrategies.builder()
            .codecs(
                clientDefaultCodecsConfigurer -> {
                  clientDefaultCodecsConfigurer
                      .defaultCodecs()
                      .jackson2JsonEncoder(
                          new Jackson2JsonEncoder(objectMapper, MediaType.APPLICATION_JSON));
                  clientDefaultCodecsConfigurer
                      .defaultCodecs()
                      .jackson2JsonDecoder(
                          new Jackson2JsonDecoder(objectMapper, MediaType.APPLICATION_JSON));
                })
            .build();

    exchangeStrategies
        .messageWriters()
        .stream()
        .filter(LoggingCodecSupport.class::isInstance)
        .forEach(writer -> ((LoggingCodecSupport) writer).setEnableLoggingRequestDetails(true));

    return exchangeStrategies;
  }

这可行，但感觉有些奇怪。问题是：我是否需要像这样包含jackson / objectMapper配置，还是有一种更简单的方法来避免Spring
objectMapper配置被覆盖？

阅读 928

2020-05-30

共1个答案

小编典典

从Spring Boot 2.1.0开始，您可以通过启用以下属性来实现此目的：

spring.http.log-request-details=true

如果您使用的是先前的Spring Boot版本，则应该能够自定义此版本，而不会覆盖或重建整个配置，如下所示：

@Configuration
static class LoggingCodecConfig {

    @Bean
    @Order(0)
    public CodecCustomizer loggingCodecCustomizer() {
        return (configurer) -> configurer.defaultCodecs()
                .enableLoggingRequestDetails(true);
    }

}

2020-05-30