1.创建自定义ModelConverter：

import java.lang.reflect.Type;
import java.time.YearMonth;
import java.util.Iterator;

import com.fasterxml.jackson.databind.type.SimpleType;

import io.swagger.v3.core.converter.AnnotatedType;
import io.swagger.v3.core.converter.ModelConverter;
import io.swagger.v3.core.converter.ModelConverterContext;
import io.swagger.v3.oas.models.media.Schema;

/*

* Custom ModelConverter that create a custom schema for YearMonth types
* /

public class CustomModelConverter implements ModelConverter {
    private static final Schema SCHEMA_YEAR_MONTH = new Schema().type("string").format("year-month").example("2020-06");

    @Override
    public Schema resolve(AnnotatedType annotatedType, ModelConverterContext context, Iterator<ModelConverter> chain) {
        Type type = annotatedType.getType();
        if (type instanceof SimpleType) {
            SimpleType simpleType = (SimpleType) type;

            if (simpleType.getRawClass().isAssignableFrom(YearMonth.class)) {
                return SCHEMA_YEAR_MONTH;
            }
        }

        // It's needed to follow chain for unresolved types
        if (chain.hasNext()) {
            return chain.next().resolve(annotatedType, context, chain);
        }
        return null;
    }
}

1.注册您的自定义ModelConverter：

ModelConverters.getInstance().addConverter(new CustomModelConverter());

建议：将其作为JAX-RS激活器上的静态初始化程序块