objectMapperconfig

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.text.SimpleDateFormat;


@Slf4j
@Configuration
public class ConfigObjectMapper {

    @Bean("objectMapper")
    public ObjectMapper objectMapper() {

        ObjectMapper objectMapper = new ObjectMapper();
        //configure方法 配置一些需要的参数
        // 转换为格式化的json 显示出来的格式美化
        objectMapper.enable(SerializationFeature.INDENT_OUTPUT);

        //序列化的时候序列对象的那些属性  
        //JsonInclude.Include.NON_DEFAULT 属性为默认值不序列化 
        //JsonInclude.Include.ALWAYS      所有属性
        //JsonInclude.Include.NON_EMPTY   属性为 空（“”） 或者为 NULL 都不序列化 
        //JsonInclude.Include.NON_NULL    属性为NULL 不序列化
        objectMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);


        //反序列化时,遇到未知属性会不会报错 
        //true - 遇到没有的属性就报错 false - 没有的属性不会管，不会报错
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        //如果是空对象的时候,不抛异常  
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);

        // 忽略 transient 修饰的属性
        objectMapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER, true);

        //修改序列化后日期格式
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

        //处理不同的时区偏移格式
        objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        objectMapper.registerModule(new JavaTimeModule());
        return objectMapper;

    }

}