我正在尝试使用@JsonView
批注从Spring反序列化对象中的多个字段。但是,我将注释添加到方法中,而不是反序列化指定字段,而是返回一个空对象。
这是我的POJO:
@Entity
data class Album(
@JsonView(View.AlbumSummary::class)
val title: String,
@JsonView(View.AlbumSummary::class)
@ManyToMany
val artists: List<Account>,
val dateReleased: LocalDate,
val genre: String = GENRE_NA,
@OneToMany(mappedBy = "album")
val songs: List<Song> = ArrayList(),
val description: String = ""
)
此外,实现@JsonView
批注的方法:
@JsonView(View.AlbumSummary::class)
@RequestMapping("/home-recommendations/{userId}")
fun getHomeRecommendations(@PathVariable userId: String): List<Recommendation> {
val recommendations = ArrayList<Recommendation>()
val user = accountRepository.findById(userId).get()
val followingArtists = user.following.filter {
it.following.isArtist
}
val suggestedArtists = followingArtists.shuffled().take(Random().nextInt(11) + 10)
for (i in 0 until suggestedArtists.size) {
val suggestedArtist = suggestedArtists[i].following
val recommendedAlbums = suggestedArtist.albums.shuffled().take(Random().nextInt(6) + 10)
recommendations.add(Recommendation("Because you listened to ${suggestedArtist.fullName}", Recommendation.TYPE_ALBUM, albums = recommendedAlbums))
}
return recommendations
}
编辑:我的gradle配置:
buildscript {
ext {
kotlinVersion = '1.2.50'
springBootVersion = '2.0.3.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-noarg:${kotlinVersion}")
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'kotlin-jpa'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
group = 'com.aceinteract'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
compileTestKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-rest')
compile('org.springframework.boot:spring-boot-starter-jdbc')
compile('org.springframework.boot:spring-boot-starter-mustache')
compile('org.springframework.boot:spring-boot-starter-web')
compile('com.fasterxml.jackson.module:jackson-module-kotlin')
compile("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
compile("org.jetbrains.kotlin:kotlin-reflect")
runtime('org.postgresql:postgresql')
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile('org.springframework.restdocs:spring-restdocs-mockmvc')
}
如果需要,我可以提供更多代码。预先感谢。
P.S。将@JsonView
注释从方法中删除后,相同的代码可以完美工作
此外,我正在使用IntelliJ Idea
答案 0 :(得分:0)
确保您的类路径上有Jackson Module for Kotlin并在ObjectMapper实例上注册。
答案 1 :(得分:0)
如FasterXML文档中所述。如果使用 proguard ,则可能会删除kotlin.Metadata批注,以防止反序列化。添加一个proguard规则来保留kotlin.Metadata类:-keep class kotlin.Metadata { *; }
尝试使用@field:JsonView(View.AlbumSummary::class)
答案 2 :(得分:0)
我遇到了同样的问题,只有在将字段移出构造函数并移到类主体中之后,JsonView才起作用。在这种情况下,您不会使用数据类,但仍可以将equals哈希码toString委派给私有内部数据类。