HttpMessageConverter如果不指定Accept和Content-Type，那么HttpMessageConverter按順序調用canRead方法判斷（默認canRead方法中分別調用supports和重載的canRead方法，其中supports方法由子類實現，canRead方法根據MediaType判斷，如果為null則返回true。但Jackson轉換器重寫了canRead方法）

自定義HttpMessageConverter

• 實現請求參數為properties數據結構，返回json數據結構
  
  

1、創建自定義HttpMessageConverter

package com.cnbi.sourceread.mvc.converter;import com.cnbi.sourceread.bean.Person; import org.springframework.http.HttpInputMessage; import org.springframework.http.HttpOutputMessage; import org.springframework.http.MediaType; import org.springframework.http.converter.AbstractHttpMessageConverter; import org.springframework.http.converter.HttpMessageNotReadableException; import org.springframework.http.converter.HttpMessageNotWritableException;import java.io.IOException; import java.io.InputStream; import java.nio.charset.Charset; import java.util.Properties;/*** @ClassName MappingPropertiesHttpMessageConverter* @Description Properties參數轉換* @Author Wangjunkai* @Date 2021/2/20 23:28**/public class MappingPropertiesHttpMessageConverter extends AbstractHttpMessageConverter {public MappingPropertiesHttpMessageConverter(){super(Charset.forName("UTF-8"), MediaType.valueOf("application/properties"));}@Overrideprotected boolean supports(Class clazz) {return clazz.isAssignableFrom(Person.class);}@Overrideprotected Object readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {InputStream body = inputMessage.getBody();Properties properties = new Properties();properties.load(body);return new Person(Long.parseLong(properties.getProperty("person.age")), properties.getProperty("person.name"));}@Overrideprotected void writeInternal(Object o, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {Properties properties = new Properties();if(o instanceof Person){Person person = (Person) o;properties.setProperty("person.age", String.valueOf(person.getAge()));properties.setProperty("person.name", person.getName());}properties.store(outputMessage.getBody(), "write by server");} }

2、添加MappingPropertiesHttpMessageConverter

package com.cnbi.sourceread.mvc.converter;import org.springframework.context.annotation.Configuration; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;import java.util.List;/*** @ClassName ConsumerMvcConfiger* @Description 自定義MVC配置* @Author Wangjunkai* @Date 2021/2/20 23:39**/ @Configuration public class ConsumerMvcConfiger extends WebMvcConfigurationSupport {@Overridepublic void configureMessageConverters(List<HttpMessageConverter<?>> converters) {converters.add(new MappingPropertiesHttpMessageConverter());addDefaultHttpMessageConverters(converters);} }

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