Resolves the interface method that allows annotation requests to be written in postman

1. We like to be in postman Write field comments in   You can more intuitively see the meaning of the field     as follows ：

2. However, if the back-end interface does not do any processing, the following error will be reported ：

3. resolvent     Add the following configuration to the framework to solve the problem ：

package net.longjin.comm.handle;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.*;
import com.fasterxml.jackson.datatype.jsr310.ser.*;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.io.Serializable;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.List;

/**
 * author  He Zhipeng 
 * CREATED_DATE 2020/4/21 9:49
 */
@Configuration
public class JsonSerializableConfig implements WebMvcConfigurer {
    @Bean
    public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter() {

        MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        //  For empty objects, turn json Don't throw errors when 
        objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
        //  Disable an exception thrown when an unknown property is encountered 
        objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        // Allow comments 
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        //  serialize BigDecimal Do not use scientific counting to output 
        objectMapper.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
        //  Date and time formatting 
        JavaTimeModule localDateTime = new JavaTimeModule();
        localDateTime.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        localDateTime.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));

        localDateTime.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        localDateTime.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));

        localDateTime.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
        localDateTime.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        localDateTime.addSerializer(MonthDay.class, new MonthDaySerializer(DateTimeFormatter.ofPattern("MM-dd")));
        localDateTime.addDeserializer(MonthDay.class, new MonthDayDeserializer(DateTimeFormatter.ofPattern("MM-dd")));

        localDateTime.addSerializer(Year.class, new YearSerializer(DateTimeFormatter.ofPattern("yyyy")));
        localDateTime.addDeserializer(Year.class, new YearDeserializer(DateTimeFormatter.ofPattern("yyyy")));

        localDateTime.addSerializer(YearMonth.class, new YearMonthSerializer(DateTimeFormatter.ofPattern("yyyy-MM")));
        localDateTime.addDeserializer(YearMonth.class, new YearMonthDeserializer(DateTimeFormatter.ofPattern("yyyy-MM")));

        objectMapper.registerModule(localDateTime);
        jsonConverter.setObjectMapper(objectMapper);
        return jsonConverter;
    }

    /*@Bean
    public FilterRegistrationBean mdcFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new MdcFilter());
        filterRegistrationBean.setOrder(99);
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.setName("mdcFilter");
        return filterRegistrationBean;
    }*/

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(customJackson2HttpMessageConverter());
    }
}

4. Just call it again