这是我遇到的***的.我想我是在某个地方的 Jackson 用户组论坛上看到的.

This the best I've come across. I think I saw it on the Jackson user group forums somewhere.

本质上，它创建了一个自定义注解内省器，如果它看到它有一个特定的注解(在本例中为 JsonTypeInfo)，则返回 null

Essentially it makes a custom annotation introspector, which returns null if it sees that it has a specific annotation (in this case JsonTypeInfo)

JacksonAnnotationIntrospector ignoreJsonTypeInfoIntrospector = new JacksonAnnotationIntrospector() {
            @Override
            protected TypeResolverBuilder<?> _findTypeResolver(
                    MapperConfig<?> config, Annotated ann, JavaType baseType) {
                if (!ann.hasAnnotation(JsonTypeInfo.class)) {
                    return super._findTypeResolver(config, ann, baseType);
                }
                return null;
            }
        };

        mapper.setAnnotationIntrospector(ignoreJsonTypeInfoIntrospector);