java - Springboot 1.5.1迁移到2.0.1实例格式

Question

我想将我的 springboot 项目从 1.5.1 迁移到 2.0.1。

但是当我在 RestController 中返回模型时，Instant 格式是不同的。

返回对象:

public class Message {
     private Instant instant;

}

在 1.5.1 中:

{
    "instant": {
         "epochSecond": 1537263091,
         "nano": 557000000
    }
}

在 2.0.1 中:

{
     "instant": "2018-09-18T09:46:02.646Z"
}

我怎样才能得到这个{ “立即的”: { “时代第二”:1537263091， “纳米”:557000000 } 当我使用 2.0.1 时？

Answer 1

您可以在 application.properties 上设置此操作:

spring.jackson.serialization.write_dates_as_timestamps=false

在迁移时，如果您添加了以下任何依赖项，请尝试将其删除:

jackson-modules-java8
jackson-datatype-jsr310

[已更新]

另一种方法，您可以为 Instant 编写序列化程序:

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.time.Instant;

public class CustomInstantSerializer extends JsonSerializer<Instant> {

    @Override
    public void serialize(Instant o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeObject(new EpochInstant(o));
    }

    public static class EpochInstant {

        private final long epochSecond;
        private final int nano;

        EpochInstant(Instant instant) {
            this.epochSecond = instant.getEpochSecond();
            this.nano = instant.getNano();
        }
    }
}

并有一个配置类，将 Instant 设置为使用序列化器:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import java.time.Instant;

@Configuration
public class JacksonConfiguration {

    @Bean
    @Primary
    public ObjectMapper objectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(Instant.class, new CustomInstantSerializer());

        return objectMapper;
    }
}