【发布时间】：2017-11-05 10:11:29
【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 将自动配置处理 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该问题，解决方案始终是添加 jackson-datatype-jsr310 依赖项，但在我的情况下它不起作用。
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：
@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：
{
"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>
【问题讨论】：
-
此 Jackson 模块已弃用。阅读文档：github.com/FasterXML/jackson-datatype-jsr310，并使用未弃用的替换。
-
我发现了一个有用的帖子here，作者在参数上使用了
@JsonSerialize(using = LocalDateSerializer.class)。除了@JB Nizet 提到的使用更新的 maven dep -
它已被弃用，但你知道为什么 Spring Boot Autoconfigure 仍在使用它吗：github.com/spring-projects/spring-boot/blob/…
标签： spring spring-boot