RestTemplate的converters配置

最新推荐文章于 2023-08-25 20:05:07 发布

转载最新推荐文章于 2023-08-25 20:05:07 发布 · 707 阅读

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原文链接：https://my.oschina.net/go4it/blog/843717

文章标签：

#测试 #java #javascript #ViewUI

本文介绍如何在Spring框架中定制RestTemplate组件，包括初始化默认的消息转换器、添加自定义的消息转换器以及修改现有的转换器配置。这些操作对于提高RestTemplate的灵活性和适配特定的应用场景非常有用。

为什么80%的码农都做不了架构师？>>>

##RestTemplate org/springframework/spring-web/4.3.5.RELEASE/spring-web-4.3.5.RELEASE-sources.jar!/org/springframework/web/client/RestTemplate.java


	private final List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();

	/**
	 * Create a new instance of the {@link RestTemplate} using default settings.
	 * Default {@link HttpMessageConverter}s are initialized.
	 */
	public RestTemplate() {
		this.messageConverters.add(new ByteArrayHttpMessageConverter());
		this.messageConverters.add(new StringHttpMessageConverter());
		this.messageConverters.add(new ResourceHttpMessageConverter());
		this.messageConverters.add(new SourceHttpMessageConverter<Source>());
		this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());

		if (romePresent) {
			this.messageConverters.add(new AtomFeedHttpMessageConverter());
			this.messageConverters.add(new RssChannelHttpMessageConverter());
		}

		if (jackson2XmlPresent) {
			this.messageConverters.add(new MappingJackson2XmlHttpMessageConverter());
		}
		else if (jaxb2Present) {
			this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
		}

		if (jackson2Present) {
			this.messageConverters.add(new MappingJackson2HttpMessageConverter());
		}
		else if (gsonPresent) {
			this.messageConverters.add(new GsonHttpMessageConverter());
		}
	}

##判断是否present

	private static boolean romePresent =
			ClassUtils.isPresent("com.rometools.rome.feed.WireFeed", RestTemplate.class.getClassLoader());

	private static final boolean jaxb2Present =
			ClassUtils.isPresent("javax.xml.bind.Binder", RestTemplate.class.getClassLoader());

	private static final boolean jackson2Present =
			ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", RestTemplate.class.getClassLoader()) &&
					ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", RestTemplate.class.getClassLoader());

	private static final boolean jackson2XmlPresent =
			ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", RestTemplate.class.getClassLoader());

	private static final boolean gsonPresent =
			ClassUtils.isPresent("com.google.gson.Gson", RestTemplate.class.getClassLoader());

##额外添加converters

	@Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory());
        restTemplate.getMessageConverters().add(new FormHttpMessageConverter());
        return restTemplate;
    }

##修改converter

	@Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        List<HttpMessageConverter<?>> converters = restTemplate.getMessageConverters();
        for(HttpMessageConverter converter : converters){
            if(converter instanceof MappingJackson2HttpMessageConverter) {
                MappingJackson2HttpMessageConverter jsonConverter = (MappingJackson2HttpMessageConverter)converter;
                jsonConverter.setObjectMapper(objectMapper());
                jsonConverter.setSupportedMediaTypes(ImmutableList.of(new MediaType("text", "ejson", MappingJackson2HttpMessageConverter.DEFAULT_CHARSET),
                        new MediaType("application", "json", MappingJackson2HttpMessageConverter.DEFAULT_CHARSET),
                        new MediaType("text", "javascript", MappingJackson2HttpMessageConverter.DEFAULT_CHARSET)));
            }
        }
        return restTemplate;
    }

或者

@Configuration
public class WebConfig extends WebMvcConfigurationSupport {

 @Bean
 public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter() {
  MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
  ObjectMapper objectMapper = new ObjectMapper();
  objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
  jsonConverter.setObjectMapper(objectMapper);
  return jsonConverter;
 }
 
 @Override
 public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
  converters.add(customJackson2HttpMessageConverter());
  super.addDefaultHttpMessageConverters();
 }
}

##doc