HttpMessageConverter

    HttpMessageConverter如果不指定Accept和Content-Type，那么HttpMessageConverter按顺序调用canRead方法判断（默认canRead方法中分别调用supports和重载的canRead方法，其中supports方法由子类实现，canRead方法根据MediaType判断，如果为null则返回true。但Jackson转换器重写了canRead方法）

自定义HttpMessageConverter

实现请求参数为properties数据结构，返回json数据结构

1、创建自定义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参数转换* @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 自定义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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HttpMessageConverter

自定义HttpMessageConverter

1、创建自定义HttpMessageConverter

2、添加MappingPropertiesHttpMessageConverter

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