Jackson2HttpMessageConverter

用处

SpringMVC中，controller中的方法返回java Bean对象，mvc将此对象转换成字符串
默认支持的mediaType: MediaType.APPLICATION_JSON, new MediaType("application", "*+json")，也就json请求

为什么改造

想让url以.html结尾的请求走json请求的逻辑

现状

当后端使用如下方法编码时，url以.html为后缀，最终会响应406状态页面

后端@RestController返回java对象

@RequestMapping(value = "/data", method = {RequestMethod.POST, RequestMethod.GET})

public ApiResult data(HttpServletRequest httpServletRequest, String type, String param, Model model) {

    return new ApiResult(2);

}

目标

修改后/data.html返回

{ "code" : 2 }

修改方式

/**

* 自定义的jackson到httpmessage的转换器

* Created by cdliujian1 on 2018/1/27.

 */

public class JMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {

/**

 * Construct a new {@link MappingJackson2HttpMessageConverter} using default configuration

 * provided by {@link Jackson2ObjectMapperBuilder}.

 */

public JMappingJackson2HttpMessageConverter() {

    this(Jackson2ObjectMapperBuilder.json().build());

}

/**

 * Construct a new {@link MappingJackson2HttpMessageConverter} with a custom {@link ObjectMapper}.

 * You can use {@link Jackson2ObjectMapperBuilder} to build it easily.

 * @see Jackson2ObjectMapperBuilder#json()

 */

public JMappingJackson2HttpMessageConverter(ObjectMapper objectMapper) {

    super(objectMapper);

    List<MediaType> mediaTypes = getSupportedMediaTypes();

    List<MediaType> newMediaTypes = new ArrayList<>();

    newMediaTypes.add(MediaType.TEXT_HTML);

    newMediaTypes.addAll(mediaTypes);

    setSupportedMediaTypes(newMediaTypes);

}

}

构造函数中，调用setSupportedMediaTypes方法，将MediaType.TEXT_HTML添加到当前HttpMessageConverter支持媒体类型中

这样当.html后缀结尾的链接到后端时，可以进入到MappingJackson2HttpMessageConverter的处理流程

MvcConfiguration

@Configuration

//@EnableWebMvc

public class MvcConfiguration extends WebMvcConfigurerAdapter {

@Override

public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder()

            .indentOutput(true)

            .dateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

    converters.add(new JMappingJackson2HttpMessageConverter(builder.build()));

    converters.add(new MappingJackson2XmlHttpMessageConverter(builder.xml().build()));

}

}

巴特西

自定义Jackson2HttpMessageConverter,适应.html后缀url

Jackson2HttpMessageConverter

用处

为什么改造

现状

目标

修改方式

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