Rest 模板 - XML 缩进答案

【问题标题】：Rest Template - XML IndentationRest 模板 - XML 缩进
【发布时间】：2017-08-12 01:51:19
【问题描述】：

在 Spring Boot 应用程序中使用 Rest Template 时，我需要使用新行和制表符缩进生成的 XML。如何在此 REST 模板中设置 JAXB Marshaller 的缩进属性。

Spring REST 模板代码：

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_XML);
    headers.add("Authorization", "Basic " +  Base64Utility.encode(userAndPass.getBytes()));

    Xml documentDefinition = myfactory.createObjects(StudentBean, ClassBean, CollegeBean);

   HttpEntity<Xml> request = new HttpEntity<>(documentDefinition, headers);

   URI result = restTemplate.postForLocation(builder.toUriString(), request);

Rest 模板配置代码：

@Bean
@Qualifier("restTemp")
public RestTemplate restTemplate(RestTemplateBuilder builder,
                                 CloseableHttpClient httpClient) {
    return builder.requestFactory(new HttpComponentsClientHttpRequestFactory(httpClient)).build();
}

【问题讨论】：

标签： spring rest spring-boot jaxb spring-integration

【解决方案1】：

我通过以下方式注入 Jaxbmarshaller，用下面的代码解决了这个问题：

@Bean
@Qualifier("restTemplate")
public RestTemplate restTemplate(RestTemplateBuilder builder,
                                 CloseableHttpClient httpClient) {
    RestTemplate restTemplate = builder.requestFactory(new HttpComponentsClientHttpRequestFactory(httpClient)).build();

    List<HttpMessageConverter<?>> converters = new ArrayList<>();
    converters.add(getMarshallingHttpMessageConverter());
    converters.add(new Jaxb2RootElementHttpMessageConverter());
    converters.add(new MappingJackson2HttpMessageConverter());
    restTemplate.setMessageConverters(converters);
    return restTemplate;
}

@Bean(name = "marshallingHttpMessageConverter")
public MarshallingHttpMessageConverter getMarshallingHttpMessageConverter() {
    MarshallingHttpMessageConverter marshallingHttpMessageConverter = new MarshallingHttpMessageConverter();
    marshallingHttpMessageConverter.setMarshaller(getJaxb2Marshaller());
    marshallingHttpMessageConverter.setUnmarshaller(getJaxb2Marshaller());
    return marshallingHttpMessageConverter;
}

@Bean(name = "jaxb2Marshaller")
public Jaxb2Marshaller getJaxb2Marshaller() {
    Map<String, Object> props = new HashMap<>();
    props.put(javax.xml.bind.Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
    Jaxb2Marshaller jaxb2Marshaller = new Jaxb2Marshaller();
    jaxb2Marshaller.setClassesToBeBound(Xml.class);
    jaxb2Marshaller.setMarshallerProperties(props);
    return jaxb2Marshaller;
}

【讨论】：

【解决方案2】：

您必须向该RestTemplate bean 注入Jaxb2RootElementHttpMessageConverter 的扩展。并实现它的方法：

/**
 * Customize the {@link Marshaller} created by this
 * message converter before using it to write the object to the output.
 * @param marshaller the marshaller to customize
 * @since 4.0.3
 * @see #createMarshaller(Class)
 */
protected void customizeMarshaller(Marshaller marshaller) {
}

为此提供财产：

setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

【讨论】：