具有两个MVC配置的Spring Boot [英] Spring Boot with Two MVC Configurations

问题描述

我有一个带有REST API的Spring Boot应用程序，使用Jackson进行JSON视图配置.它很棒，我可以得到所有Spring Boot的好处.

I have a Spring Boot app with a REST API, using Jackson for the JSON view configuration. It works great and I can get all the Spring Boot goodness.

但是，我需要添加一个相似但具有不同设置的附加REST API.例如，除其他外，它需要一个不同的Jackson对象映射器配置，因为JSON看起来会大不相同(例如，没有JSON数组).那只是一个例子，但是有很多差异.每个API都有不同的上下文(例如/api/current和/api/legacy).

However, I need to add an additional REST API that is similar but with different settings. For example, among other things, it needs a different Jackson object mapper configuration because the JSON will look quite a bit different (e.g. no JSON arrays). That is just one example but there are quite a few differences. Each API has a different context (e.g. /api/current and /api/legacy).

理想情况下，我希望将两个MVC配置映射到这些不同的上下文，而不必放弃启动时的任何自动连线.

Ideally I'd like two MVC configs mapped to these different contexts, and not have to give up any of the automatic wiring of things in boot.

到目前为止，我能够使用的两个调度程序servlet各自具有自己的MVC配置，但是，这导致Boot丢弃了我自动获得的一堆东西，并且基本上消除了使用boot的原因.

So far all I've been able to get close on is using two dispatcher servlets each with its own MVC config, but that results in Boot dropping a whole bunch of things I get automatically and basically defeats the reason for using boot.

我无法将应用拆分为多个应用.

I cannot break the app up into multiple apps.

答案您无法使用Boot来执行此操作，而仍然获得其所有魔力"是一个可以接受的答案.似乎它应该能够解决这个问题.

The answer "you cannot do this with Boot and still get all its magic" is an acceptable answer. Seems like it should be able to handle this though.

推荐答案

详细介绍我昨天的评论和@Ashoka标头的想法，我建议为自定义媒体类型注册2个MessageConverters(旧版和最新版).您可以这样操作:

Expanding on my comment of yesterday and @Ashoka Header idea i would propose to register 2 MessageConverters (legacy and current) for custom media types. You can do this like that:

@Bean
MappingJackson2HttpMessageConverter currentMappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();
    // set features
    jsonConverter.setObjectMapper(objectMapper);

    jsonConverter.setSupportedMediaTypes(Arrays.asList(new MediaType("json", "v2")));

    return jsonConverter;
}


@Bean
MappingJackson2HttpMessageConverter legacyMappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();
    // set features
    jsonConverter.setObjectMapper(objectMapper);
    return jsonConverter;
}

请注意其中一个转换器的自定义媒体类型.

Pay attention to the custom media-type for one of the converters.

如果愿意，可以使用拦截器将@Ashoka提议的Version-Header重写为自定义Media-Type，如下所示:

If you like , you can use an Interceptor to rewrite the Version-Headers proposed by @Ashoka to a custom Media-Type like so:

public class ApiVersionMediaTypeMappingInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {
        try {
            if(request.getHeader("X-API-Version") == "2") {
                request.setAttribute("Accept:","json/v2");
            }
       .....
    }
}

这可能不是您要找的确切答案，但也许可以提供一些启发.像这样注册拦截器.

This might not be the exact answer you were looking for, but maybe it can provide some inspiration. An interceptor is registered like so.

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