@Component
public class StringToEnumConverterFactory implements ConverterFactory<String, Enum> {
    @Override
    public <T extends Enum> Converter<String, T> getConverter(Class<T> targetType) {
        return new EnumTypeConverter(targetType);
    }

    public static class EnumTypeConverter<T extends Enum> implements Converter<String, T> {
        private EnumWrap enumWrap;
        public EnumTypeConverter(Class<T> targetType){
            this.enumWrap = new EnumWrap(targetType);
        }
        @Override
        public T convert(String value) throws ConvertException {
            Enum value2 = enumWrap.getCustom(value);
            if(value2 != null){
                return (T)value2;
            }
            return (T)enumWrap.get(value);
        }
    }
}

@Controller
public class DemoController {
    @Mapping("demo")
    public String demo(DemoType cat) {
        return cat.title;
    }
}

public enum DemoType {
    Demo1(1, "demo1"),
    Demo2(2, "demo2");
    
    @Use //表示使用此字段（只是示例，具体可与 json 框架的注解连动）
    public int code;
    public String title;

    DemoType(int code, String title) {
        this.code = code;
        this.title = title;
    }
}