使用 Spring Boot 序列化为对象的 Java 8 日期时间类型 [英] Java 8 date time types serialized as object with Spring Boot
问题描述
我有一个包含 Java 8 日期时间类型字段的实体.问题是这些字段被序列化为对象.我添加了 jackson-datatype-jsr310
依赖项,因此 Spring Boot 1.5.7 会自动配置处理 Java 8 日期时间类型的 JavaTimeModule
.似乎该模块未注册(我在 JavaTimeModule 构造函数中放置了一个断点).我知道我不需要自定义 ObjectMapper
.我花了几个小时阅读这个问题,解决方案总是添加 jackson-datatype-jsr310
依赖项,但在我的情况下不起作用.
I have an entity with fields of Java 8 date time types. The issue is that these fields are serialized as object. I added the jackson-datatype-jsr310
dependency, so Spring Boot 1.5.7 would auto configure the JavaTimeModule
that handles Java 8 date time types. It seems that the module is not registered (I put a breakpoint in JavaTimeModule constructor). I know I don't need a custom ObjectMapper
. I spent hours reading about that issue and the solution is always to add the jackson-datatype-jsr310
dependency but it does not work in my case.
实体:
@Entity
public class DateTimeEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private LocalDate localDate;
private LocalDateTime localDateTime;
private Instant instant;
private OffsetDateTime offsetDateTime;
private ZonedDateTime zonedDateTime;
}
RestController 方法:
The RestController method:
@GetMapping("/datetimes/{id}")
public ResponseEntity<DateTimeEntity> getById(@PathVariable Long id) {
DateTimeEntity dateTimeEntity = dateTimeRepository.findOne(id);
return new ResponseEntity<DateTimeEntity>(dateTimeEntity, HttpStatus.OK);
}
返回的 JSON 对象:
The JSON object returned:
{
"id": 1,
"localDate": null,
"localDateTime": null,
"instant": {
"epochSecond": 1508772600,
"nano": 0
},
"offsetDateTime": {
"offset": {
"totalSeconds": 0,
"id": "Z",
"rules": {
"fixedOffset": true,
"transitionRules": [],
"transitions": []
}
},
"dayOfMonth": 23,
"dayOfWeek": "MONDAY",
"dayOfYear": 296,
"month": "OCTOBER",
"monthValue": 10,
"year": 2017,
"hour": 15,
"minute": 30,
"nano": 0,
"second": 0
},
"zonedDateTime": {
"offset": {
"totalSeconds": 0,
"id": "Z",
"rules": {
"fixedOffset": true,
"transitionRules": [],
"transitions": []
}
},
"zone": {
"totalSeconds": 0,
"id": "Z",
"rules": {
"fixedOffset": true,
"transitionRules": [],
"transitions": []
}
},
"dayOfMonth": 23,
"dayOfWeek": "MONDAY",
"dayOfYear": 296,
"month": "OCTOBER",
"monthValue": 10,
"year": 2017,
"hour": 15,
"minute": 30,
"nano": 0,
"second": 0,
"chronology": {
"id": "ISO",
"calendarType": "iso8601"
}
}
}
POM 文件:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>framework-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<mockito.version>2.11.0</mockito.version>
<org.mapstruct.version>1.2.0.Final</org.mapstruct.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-jdk8</artifactId>
<version>${org.mapstruct.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>${jackson.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<annotationProcessorPaths>
<path>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>${org.mapstruct.version}</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
<plugin>
<groupId>org.asciidoctor</groupId>
<artifactId>asciidoctor-maven-plugin</artifactId>
<version>1.5.5</version>
<executions>
<execution>
<id>output-html</id>
<phase>generate-resources</phase>
<goals>
<goal>process-asciidoc</goal>
</goals>
<configuration>
<backend>html</backend>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
推荐答案
解决方案是将依赖项添加到类路径.出于某种原因,它不在 IDE 中.
The solution was to add the dependency to the classpath. For some reason, it was not in the IDE.
即使不推荐使用依赖项,它仍然被 spring-boot-autoconfigure
模块使用.参见 Spring Boot 代码
Even though the dependency is deprecated, it's still used by spring-boot-autoconfigure
module. See Spring Boot Code
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
</dependency>
当它在类路径中时,Java 8 日期和时间对象被序列化为时间戳.
when it's in the classpath, Java 8 date and time objects are serialized as a timestamp.
这篇关于使用 Spring Boot 序列化为对象的 Java 8 日期时间类型的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!