Spring Boot 中的 LocalDateTime 格式

Question

嘿，我遇到了与这里相同的问题：JSON Java 8 LocalDateTime format in Spring Boot我尝试了那里的解决方案，但它不起作用。有人可以告诉我我做错了什么吗？

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我添加了

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spring.jackson.serialization.write-dates-as-timestamps=false\n

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到 application.property\n我的模型类如下所示：

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package bookrental.model.book;\n\nimport bookrental.model.account.User;\nimport com.fasterxml.jackson.annotation.JsonFormat;\nimport com.fasterxml.jackson.databind.annotation.JsonDeserialize;\nimport com.fasterxml.jackson.databind.annotation.JsonSerialize;\nimport com.fasterxml.jackson.databind.util.ISO8601DateFormat;\nimport com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;\nimport com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;\nimport lombok.*;\n\nimport javax.persistence.*;\nimport java.time.LocalDateTime;\nimport java.util.Date;\n\n@Entity\n@Getter\n@Setter\n@EqualsAndHashCode\n@AllArgsConstructor\n@NoArgsConstructor\npublic class BookRentals {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.AUTO)\n    private int id;\n    @OneToOne\n    private Book book;\n    @OneToOne\n    private User user;\n    @JsonFormat(pattern = ("yyyy/MM/dd HH:mm:ss"))\n    @JsonSerialize(using = LocalDateTimeSerializer.class)\n    @JsonDeserialize(using = LocalDateTimeDeserializer.class)\n    private LocalDateTime dateOfRental;\n\n    public BookRentals(Book book, User user) {\n        this.book = book;\n        this.user = user;\n    }\n\n}\n

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我这样设定时间：

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private BookRentals prepareBookToRent(int userID, Book book) {\n        BookRentals bookRentals = new BookRentals(book, new User(userID));\n        bookRentals.setDateOfRental(LocalDateTime.now());\n        return bookRentals;\n    }\n

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我添加了依赖：

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<dependency>\n            <groupId>com.fasterxml.jackson.datatype</groupId>\n            <artifactId>jackson-datatype-jsr310</artifactId>\n            <version>2.9.7</version>\n        </dependency>\n

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我的 JSON 看起来像这样：

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[\n    {\n        "book": {\n            "author": "Henryk Sienkiewicz",\n            "category": "powie\xc5\x9b\xc4\x87 historyczna",\n            "id": 1,\n            "title": "Krzy\xc5\xbcacy"\n        },\n        "class": "bookrental.model.book.BookRentals",\n        "dateOfRental": {\n            "class": "java.time.LocalDateTime",\n            "dayOfMonth": 19,\n            "dayOfWeek": "WEDNESDAY",\n            "dayOfYear": 353,\n            "hour": 0,\n            "minute": 13,\n            "month": "DECEMBER",\n            "monthValue": 12,\n            "nano": 758649300,\n            "second": 8,\n            "year": 2018\n        },\n        "id": 1,\n        "user": {\n            "id": 2,\n            "name": "piotri",\n            "password": "123"\n        }\n    }\n]\n

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我还应该做什么？

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我没有尝试使用类的解决方案，因为我不知道应该将它们放在哪个包中。\n//编辑\n经过 Erik\ 的建议，pom.xml 如下所示：

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<?xml version="1.0" encoding="UTF-8"?>\n<project xmlns="http://maven.apache.org/POM/4.0.0"\n         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">\n<modelVersion>4.0.0</modelVersion>\n\n<groupId>com.book.rental.piotrek</groupId>\n<artifactId>BookRental</artifactId>\n<version>1.0-SNAPSHOT</version>\n\n<build>\n    <plugins>\n        <plugin>\n            <groupId>org.apache.maven.plugins</groupId>\n            <artifactId>maven-compiler-plugin</artifactId>\n            <configuration>\n                <source>8</source>\n                <target>8</target>\n            </configuration>\n        </plugin>\n    </plugins>\n</build>\n\n<parent>\n    <groupId>org.springframework.boot</groupId>\n    <artifactId>spring-boot-starter-parent</artifactId>\n    <version>2.1.1.RELEASE</version>\n    <relativePath/>\n</parent>\n\n\n<dependencies>\n    <dependency>\n        <groupId>org.springframework.boot</groupId>\n        <artifactId>spring-boot-starter-web</artifactId>\n    </dependency>\n    <dependency>\n        <groupId>org.springframework.boot</groupId>\n        <artifactId>spring-boot-starter-test</artifactId>\n        <scope>test</scope>\n    </dependency>\n    <dependency>\n        <groupId>org.springframework.boot</groupId>\n        <artifactId>spring-boot-starter-data-jpa</artifactId>\n    </dependency>\n    <dependency>\n        <groupId>com.h2database</groupId>\n        <artifactId>h2</artifactId>\n    </dependency>\n    <dependency>\n        <groupId>org.projectlombok</groupId>\n        <artifactId>lombok</artifactId>\n        <version>1.16.22</version>\n    </dependency>\n    <dependency>\n        <groupId>javax.validation</groupId>\n        <artifactId>validation-api</artifactId>\n    </dependency>\n    <dependency>\n        <groupId>net.sf.flexjson</groupId>\n        <artifactId>flexjson</artifactId>\n        <version>2.1</version>\n    </dependency>\n</dependencies>\n\n</project>\n

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升级失败。\nJSON:

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[\n    {\n        "book": {\n            "author": "Henryk Sienkiewicz",\n            "category": "powie\xc5\x9b\xc4\x87 historyczna",\n            "id": 1,\n            "title": "Krzy\xc5\xbcacy"\n        },\n        "dateOfRental": {\n            "dayOfMonth": 19,\n            "dayOfWeek": "WEDNESDAY",\n            "dayOfYear": 353,\n            "hour": 11,\n            "minute": 22,\n            "month": "DECEMBER",\n            "monthValue": 12,\n            "nano": 884499000,\n            "second": 17,\n            "year": 2018\n        },\n        "id": 7,\n        "user": {\n            "id": 5,\n            "name": "admin",\n            "password": "123"\n        }\n    }\n]\n

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图书租赁：

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package bookrental.model.book;\n\nimport bookrental.model.account.User;\nimport lombok.*;\n\nimport javax.persistence.*;\nimport java.time.LocalDateTime;\n\n@Entity\n@Getter\n@Setter\n@EqualsAndHashCode\n@AllArgsConstructor\n@NoArgsConstructor\npublic class BookRentals {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.AUTO)\n    private int id;\n    @OneToOne\n    private Book book;\n    @OneToOne\n    private User user;\n    private LocalDateTime dateOfRental;\n\n    public BookRentals(Book book, User user) {\n        this.book = book;\n        this.user = user;\n    }\n}\n

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//编辑2

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嘿。无意中我发现了问题的原因。我有一个类负责为确切的用户找到确切的咆哮。当我去时，/books/rentals/{userID}我得到了格式正确的日期。正如你所看到的方法 return List<BookRentals>。在BookRentalsService我返回 ResponseEntity 中，我认为因此它看起来像这样。你知道如何解决吗？

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    package bookrental.service.account;\n\n    import bookrental.model.book.BookRentals;\n    import bookrental.repository.book.BookRentalsRepository;\n    import org.springframework.beans.factory.annotation.Autowired;\n    import org.springframework.stereotype.Service;\n\n    import java.util.List;\n\n    @Service\n    public class UserRentalsService {\n\n        private final BookRentalsRepository bookRentalsRepository;\n\n        @Autowired\n        public UserRentalsService(BookRentalsRepository bookRentalsRepository) {\n            this.bookRentalsRepository = bookRentalsRepository;\n        }\n\n        public List<BookRentals> findUserRentalsByGivenID(int userID) {\n            return bookRentalsRepository.getUserRentalsByGivenID(userID);\n        }\n    }\n\n\npackage bookrental.controller.account;\n\nimport bookrental.model.book.BookRentals;\nimport bookrental.service.account.UserRentalsService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.GetMapping;\nimport org.springframework.web.bind.annotation.PathVariable;\nimport org.springframework.web.bind.annotation.RestController;\n\nimport java.util.List;\n\n@RestController\npublic class UserRentalsController {\n\n    private final UserRentalsService userRentalsService;\n\n    @Autowired\n    public UserRentalsController(UserRentalsService userRentalsService) {\n        this.userRentalsService = userRentalsService;\n    }\n\n    @GetMapping("books/rentals/{userID}")\n    public List<BookRentals> findUserRentalsByGivenID(@PathVariable int userID) {\n        return userRentalsService.findUserRentalsByGivenID(userID);\n    }\n}\n

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图书租赁服务

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package bookrental.service.book.rentals;\n\nimport bookrental.model.account.User;\nimport bookrental.model.book.Book;\nimport bookrental.model.book.BookRentals;\nimport bookrental.repository.account.UserRepository;\nimport bookrental.repository.book.BookRepository;\nimport bookrental.repository.book.BookRentalsRepository;\nimport flexjson.JSONSerializer;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.http.HttpHeaders;\nimport org.springframework.http.HttpStatus;\nimport org.springframework.http.ResponseEntity;\nimport org.springframework.stereotype.Service;\n\nimport java.time.LocalDateTime;\nimport java.util.ArrayList;\nimport java.util.List;\n\n@Service\npublic class BookRentalService {\n\n    private final UserRepository userRepository;\n    private final BookRepository bookRepository;\n    private final BookRentalsRepository bookRentalsRepository;\n\n    @Autowired\n    public BookRentalService(BookRepository bookRepository, BookRentalsRepository bookRentalsRepository, UserRepository userRepository) {\n        this.bookRepository = bookRepository;\n        this.bookRentalsRepository = bookRentalsRepository;\n        this.userRepository = userRepository;\n    }\n\n    ....\n\n    public ResponseEntity<String> findAllRentals() {\n        List<BookRentals> rentedBooks = new ArrayList<>();\n        bookRentalsRepository.findAll().forEach(rentedBooks::add);\n        HttpHeaders headers = new HttpHeaders();\n        headers.add("Content-Type", "application/json; charset=utf-8");\n        return new ResponseEntity<>(new JSONSerializer().exclude("book.class")\n                .exclude("book.available")\n                .exclude("dateOfReturn")\n                .exclude("*.class")\n                .exclude("user.amountOfCashToPay")\n                .exclude("password")\n                .serialize(rentedBooks), headers, HttpStatus.OK);\n    }\n\n}\n

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Answer 1

您甚至需要@JsonSerialize(using = LocalDateTimeSerializer.class)和吗@JsonDeserialize(using = LocalDateTimeDeserializer.class)？

我遇到了完全相同的问题，也使用了jackson-datatype-jsr310依赖项。切换到spring-boot-starter-json解决了我的问题：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-json</artifactId>
    <version>2.0.3.RELEASE</version>
</dependency>