Java @JsonSerialize不工作
在Spring/Hibernate项目中,在我的实体类中,我有:Java @JsonSerialize不工作,java,json,spring,jackson,jsonserializer,Java,Json,Spring,Jackson,Jsonserializer,在Spring/Hibernate项目中,在我的实体类中,我有: package klab.finance.main.entity; import com.fasterxml.jackson.annotation.JsonIgnoreProperties; import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonS
package klab.finance.main.entity;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import klab.backend.entity.postgres.base.BaseEntity;
import klab.backend.utils.DateTimeUtils;
import klab.backend.utils.JsonDateTime;
import klab.backend.utils.json.LocalDateTimeToTimestampDeserializer;
import klab.backend.utils.json.TimestampToLocalDateTimeSerializer;
import org.hibernate.annotations.Where;
import org.joda.time.LocalDateTime;
import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;
@Entity
@Table(name="transactions")
@JsonIgnoreProperties(ignoreUnknown = true)
public class Transaction extends BaseEntity {
private Long bankTransactionDate;
@Column(name="bank_transaction_date")
@JsonSerialize(using = TimestampToLocalDateTimeSerializer.class)
public Long getBankTransactionDate(){
return bankTransactionDate;
}
@JsonDeserialize(using = LocalDateTimeToTimestampDeserializer.class)
public void setBankTransactionDate(Long bankTransactionDate){
this.bankTransactionDate=bankTransactionDate;
}
}
我的序列化程序类:
package klab.backend.utils.json;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import klab.backend.entity.postgres.base.BaseEntity;
import klab.backend.utils.DateTimeUtils;
import org.joda.time.LocalDateTime;
import java.io.IOException;
public class TimestampToLocalDateTimeSerializer extends JsonSerializer<Long> {
@Override
public void serialize(Long value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
throws IOException {
jsonGenerator.writeString("blabla");
}
}
包klab.backend.utils.json;
导入com.fasterxml.jackson.core.JsonGenerator;
导入com.fasterxml.jackson.databind.JsonSerializer;
导入com.fasterxml.jackson.databind.SerializerProvider;
导入klab.backend.entity.postgres.base.BaseEntity;
导入klab.backend.utils.DateTimeUtils;
导入org.joda.time.LocalDateTime;
导入java.io.IOException;
公共类TimestampToLocalDateTimeSerializer扩展了JsonSerializer{
@凌驾
公共void序列化(长值、JsonGenerator JsonGenerator、SerializerProvider SerializerProvider)
抛出IOException{
jsonGenerator.writeString(“blabla”);
}
}
我希望获得带有“bank\u transaction\u date”的JSON:“blabla”
相反,我用“bank\u transaction\u date”:null
获得它。我还注意到,如果我在序列化程序中设置了断点,调试器永远不会停止,所以它可能不会被使用
怎么了 答案非常简单:
bankTransactionDate
是null
,结果是,对于null
值,不调用序列化程序:)
在我用值填充数据库后,序列化程序开始工作,并给了我“bank\u transaction\u date”:“blabla”