Spring MVC:将默认响应格式从xml更改为json [英] Spring mvc : Changing default Response format from xml to json

问题描述

我经历了其他类似的问题，但对我没有任何帮助.

I have gone through other similar asked questions but nothing worked for me.

我所有 API的返回JSON 作为响应，默认情况下:

由于某些XML API，我不得不添加jackson-xml

Because of some XML API, i had to add jackson-xml

    <dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    </dependency>

现在默认为"没有接受标头".所有响应均为XML .

我希望将 JSON作为默认响应格式.

如此处文档所述:

https://spring.io/blog/2013/05/11/content-negotiation-using-spring-mvc

我实现了以下配置:

@Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer.favorPathExtension(false).favorParameter(true).parameterName("mediaType").ignoreAcceptHeader(true)    
                .useJaf(false).defaultContentType(MediaType.APPLICATION_JSON)
                .mediaType("xml", MediaType.APPLICATION_XML).mediaType("json", MediaType.APPLICATION_JSON);
    }

案例1:，如果我输入ignoreAcceptHeader(true)，则所有内容都是JSON，甚至XML API返回JSON.

Case 1: if i make the ignoreAcceptHeader(true) then everything is JSON even the XML API returning JSON.

情况2:，当ignoreAcceptHeader(false)为默认值时为XML.

Case 2: when ignoreAcceptHeader(false) is then default is XML.

我忘了提及我的API的样子:

I forget to mention my API's look like this:

@RequestMapping(value = "/getXml", method = RequestMethod.GET)
public ResponseEntity<String> getXml( HttpServletRequest request)
        throws JAXBException {
    return returnXml();
}

我在这里很迷路，我想要的只是Default(不带AcceptHeader)应该是JSON. (API以字符串形式返回XML)

I am quite lost here, All i want is Default(Without AcceptHeader) should be JSON. (API returns XML as String)

并且当接受标头:定义了"Application/xml"时，响应应该是XML.

And when Accept Header : "Application/xml" is defined then response should be XML.

任何建议都会有很大帮助.

Any advice would be of great help.

谢谢.

推荐答案

通常，如果要获取json响应，则需要一个jackson-databind模块:

In general if you want to get json response you need an jackson-databind module:

<dependency> 
    <groupId>com.fasterxml.jackson.core</groupId> 
    <artifactId>jackson-databind</artifactId> 
    <version>${json-jackson-version}</version> 
</dependency> 

，然后必须在配置中定义MappingJackson2HttpMessageConverter:

and then you have to define a MappingJackson2HttpMessageConverter in your configuration:

@Configuration
@EnableWebMvc
public class WebAppMainConfiguration extends WebMvcConfigurerAdapter {

    @Override 
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
        converters.add(new MappingJackson2HttpMessageConverter());

        [..] 
        super.configureMessageConverters(converters); 
    }

    [...]
}

根据您的情况，您可以实现自己的

In your case, you can implement your own AbstractGenericHttpMessageConverter so you can switch in this converter between different concrete converters depending on media type.

检查方法AbstractGenericHttpMessageConverter#writeInternal(..)

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