fastjson 2 定制序列化 ObjectWriter的问题

我在 配置类编写了 自定义的序列化 规则，但是为什么没有使用自定义的规则，还是使用了默认的规则。

JSON.register(LocalDate.class, MyLocalDateWriter.instance);

经下断点调试： 并没有运行 MyLocalDateWriter.instance 中的 write 方法，而是运行了自带的 com.alibaba.fastjson2.writer.ObjectWriterImplLocalDate 中的 write 方法，导致了 输出结果达不到期望效果。

期望效果：2022-06-13 实际效果：2022-06-13 00:00:00

是不是我的写法有问题，请多指教，写法参考 实现ObjectWriter和ObjectReader实现定制序列化和反序列化 https://alibaba.github.io/fastjson2/register_custom_reader_writer_cn

package re.lpy.supermall.user.config;

import com.alibaba.fastjson2.JSON; import com.alibaba.fastjson2.JSONReader; import com.alibaba.fastjson2.JSONWriter; import com.alibaba.fastjson2.codec.DateTimeCodec; import com.alibaba.fastjson2.support.config.FastJsonConfig; import com.alibaba.fastjson2.support.spring.http.converter.FastJsonHttpMessageConverter; import com.alibaba.fastjson2.writer.ObjectWriter; import org.springframework.context.annotation.Configuration; import org.springframework.http.MediaType; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.lang.reflect.Type; import java.nio.charset.StandardCharsets; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.util.Collections; import java.util.List;

@Configuration @EnableWebMvc public class FastJson2Configurer implements WebMvcConfigurer {

@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
    
    //自定义配置...
    FastJsonConfig config = new FastJsonConfig();
    config.setDateFormat("yyyy-MM-dd HH:mm:ss");
    
    config.setReaderFeatures(JSONReader.Feature.FieldBased,
                             JSONReader.Feature.SupportArrayToBean,
                             JSONReader.Feature.InitStringFieldAsEmpty,
                             JSONReader.Feature.SupportAutoType,
                             JSONReader.Feature.SupportClassForName,
                             JSONReader.Feature.IgnoreSetNullValue);
    // JSONWriter.Feature.WriteNulls, 输出空值
    config.setWriterFeatures(
            JSONWriter.Feature.BrowserCompatible,
            JSONWriter.Feature.NullAsDefaultValue,
            JSONWriter.Feature.PrettyFormat,
            JSONWriter.Feature.WriteBigDecimalAsPlain);
    
    converter.setFastJsonConfig(config);
    converter.setDefaultCharset(StandardCharsets.UTF_8);
    converter.setSupportedMediaTypes(Collections.singletonList(MediaType.APPLICATION_JSON));
    // 移除jackson
    converters.removeIf(converters::contains);
    converters.add(0, converter);

    JSON.register(LocalDateTime.class, MyLocalDateTimeWriter.instance); // 1
    JSON.register(LocalDate.class, MyLocalDateWriter.instance); // 1
    JSON.register(LocalTime.class, MyLocalTimeWriter.instance); // 1
}

}

class MyLocalDateTimeWriter extends DateTimeCodec implements ObjectWriter { static MyLocalDateTimeWriter instance = new MyLocalDateTimeWriter(null);

public MyLocalDateTimeWriter(String format) {
    super(format);
}

@Override
public void write(JSONWriter jsonWriter, Object o, Object o1, Type type, long l) {
        if (o == null) {
            jsonWriter.writeNull();
            return;
        }
    String typeName = type.getTypeName();
    LocalDateTime dateTime = (LocalDateTime) o;
        
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String format = formatter.format(dateTime);
        
        jsonWriter.writeString(format);
}

}

class MyLocalDateWriter implements ObjectWriter { static MyLocalDateWriter instance = new MyLocalDateWriter();

@Override
public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
    if (object == null) {
        jsonWriter.writeNull();
        return;
    }
    LocalDate date = (LocalDate) object;
    // LocalDate date = dateTime.toLocalDate();
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    String format = formatter.format(date);
    // 优先使用name
    jsonWriter.writeString(format);
}

}

class MyLocalTimeWriter implements ObjectWriter { static MyLocalTimeWriter instance = new MyLocalTimeWriter();

@Override
public void write(JSONWriter jsonWriter, Object object, Object fieldName, Type fieldType, long features) {
    if (object == null) {
        jsonWriter.writeNull();
        return;
    }
    LocalTime time = (LocalTime) object;
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss");
    String format = formatter.format(time);
    // 优先使用name
    jsonWriter.writeString(format);
}

}

fastjson 2.0.7 最新版 ，2.0.5 是可以这样的，2.0.6未知 openjdk1.8.333

原提问者GitHub用户yangcanlin