import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder; //导入依赖的package包/类
@Autowired
public AppConfigService(KvMapperFactory kvMapperFactory, ObjectMapper objectMapper) {
    // we must use custom configuration of mapper, but need use most options and modules from global mapper
    this.objectMapper = objectMapper.copy();
    StdTypeResolverBuilder trb = new ObjectMapper.DefaultTypeResolverBuilder(ObjectMapper.DefaultTyping.JAVA_LANG_OBJECT);
    trb.init(JsonTypeInfo.Id.CLASS, new CustomTypeIdResolver()).inclusion(JsonTypeInfo.As.PROPERTY);
    this.objectMapper.setDefaultTyping(trb);
    this.objectMapper.registerModule(new KvSupportModule(kvMapperFactory));
}
 

import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder; //导入依赖的package包/类
protected StdTypeResolverBuilder _constructNoTypeResolverBuilder()
{
  return StdTypeResolverBuilder.noTypeInfoBuilder();
}
 

import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder; //导入依赖的package包/类
protected StdTypeResolverBuilder _constructStdTypeResolverBuilder()
{
  return new StdTypeResolverBuilder();
}
 

import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder; //导入依赖的package包/类
/**
 * Helper method for constructing standard {@link TypeResolverBuilder}
 * implementation.
 */
protected StdTypeResolverBuilder _constructStdTypeResolverBuilder() {
    return new StdTypeResolverBuilder();
}
 

import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder; //导入依赖的package包/类
/**
 * Helper method for dealing with "no type info" marker; can't be null
 * (as it'd be replaced by default typing)
 */
protected StdTypeResolverBuilder _constructNoTypeResolverBuilder() {
    return StdTypeResolverBuilder.noTypeInfoBuilder();
}