Spring 5 MVC JSON ser / deser不尊重属性(但适用于XML)

时间:2018-08-20 12:38:13

标签: java json spring jackson jigsaw

在使用香草Spring Boot 2 / Spring 5 / Java 10 / Jigsaw的新设置中,我遇到了一种奇怪的情况,无论我做什么,通过Spring MVC拉一个对象都会给我一个空的{} JSON对象,而不是我的对象属性。

但是...如果我使用application / xml的Accept标头而不是application / json,我将获得所有正确的属性。也许我不介意,但我似乎在以前的版本中回想过,如果它在一侧(xml)上有效,则应该在另一侧(json)上有效,反之亦然。

我已经在内部追溯到为我的模型类创建的BeanSerializer,没有属性。我只是不确定为什么会这样。我在执行过程中进行了跟踪,以查看Jackson在HTTP转换过程中是否在运行...它只是忽略了对象内部的所有属性。

这是我的设置:

行家:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>10</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.2.4</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-integration</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.0</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jaxb</groupId>
        <artifactId>jaxb-runtime</artifactId>
        <version>2.3.0</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>javax.activation-api</artifactId>
        <version>1.2.0</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.module</groupId>
        <artifactId>jackson-module-jaxb-annotations</artifactId>
        <version>2.9.6</version>
        <scope>runtime</scope>
    </dependency>

module-info:

module stupid.example {
opens com.example.microservice.datasynchronizer;
opens com.example.microservice.datasynchronizer.model;
opens com.example.microservice.datasynchronizer.webflux to spring.beans, spring.core, spring.web ;
opens com.example.microservice.datasynchronizer.dao to spring.core ;

requires java.base ;
requires java.xml.bind ;
requires spring.boot;
requires spring.boot.autoconfigure;
requires spring.beans ;
requires spring.context ;
requires spring.core ;
requires spring.data.commons ;
requires spring.web ;
requires spring.webmvc ;
requires java.persistence ;
requires org.junit.jupiter.api;
requires spring.test;
requires spring.boot.test ;
}

模型类(最新的类,以防万一,带有jaxb注释):

@Entity
@XmlRootElement
public class Thingamajig {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@XmlElement
private Long id;
@XmlElement
private String firstName;
@XmlElement
private String lastName;

public Thingamajig ( ) { ; }

public Thingamajig(String firstName, String lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
}

@Override
public String toString() {
    return String.format("Thingamajig [id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
}
}

控制器:

@RestController
public class ThingamajigController {

@Autowired
private ThingamajigDao _dao ;

@GetMapping("/thing/{id}")
public Thingamajig getPerson(@PathVariable Long id) {
    Optional<Thingamajig> found = _dao.findById(id) ;
    return found.get() ;
}

@PostMapping ( "/thing" )
@ResponseStatus(HttpStatus.CREATED)
public void add(@RequestBody Thingamajig person) {
    _dao.save(person) ;
}
}

配置:

@EnableWebMvc
@SpringBootApplication
public class DataSynchronizerApplication {

public static void main(String[] args) throws Throwable {
    SpringApplication.run(DataSynchronizerApplication.class, args);
}
}

我到底想念什么?任何帮助表示赞赏。

1 个答案:

答案 0 :(得分:1)

您只是忘了在Thingamajig类中定义吸气剂和吸气剂。

XML之所以有效,是因为您已经在属性上定义了注释,但是JSON序列化程序正在寻找吸气剂。