【发布时间】：2018-04-19 07:32:56
【问题描述】：
我正在使用 Kotlin 数据类将 Feign 连接到 POST。
我调用的 API 需要 {..."brandInfo":{"TPID":1}...}
我的理解是，如果没有正确提取 jackson-module-kotlin 依赖项，Feign 将根本无法 POST，因为 Jackson 编码将彻底失败。
但是，Feign 能够发布，Jackson 能够编码，但无论我做什么，发布的内容都是 {..."brandInfo":{"tpid":1}...}，尽管使用@JsonProperty("TPID") 注释的brandInfo val。
我错过了什么？
@JsonIgnoreProperties(ignoreUnknown = true)
data class KBrandInfo (
@JsonProperty("TPID") //not honored
val TPID: Long
)
interface KConversationServiceClient {
@RequestLine("POST v2/conversations")
@Headers("Content-Type: application/json")
fun createConversation(createConversation: KCreateConversation): String
}
@Provides
public KConversationServiceClient getKConversationServiceClient(
@Named("conversationServiceUrl") String baseUri,
Feign.Builder builder) {
return builder
.logLevel(Logger.Level.FULL)
.decoder(new StringDecoder())
.encoder(new JacksonEncoder(jacksonObjectMapper())) //does this need some extra configuration in order to pick up @JsonProperty annotations?
.requestInterceptor(requestTemplate ->
requestTemplate
.header("requestId", UUID.randomUUID().toString())
.target(KConversationServiceClient.class, baseUri);
}
<properties>
...
<feign.version>9.3.1</feign.version>
<kotlin.version>1.1.51</kotlin.version>
...
</properties>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-core</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-hystrix</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-slf4j</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-jackson</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-gson</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jre8</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test-junit</artifactId>
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-kotlin</artifactId>
<version>2.7.9</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-joda</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-parameter-names</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jdk8</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>${fasterxml.jackson.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<!--Kotlin + Java + Maven implies some funky temporal dependencies and handling of annotation processing when building-->
<!--* https://kotlinlang.org/docs/reference/using-maven.html-->
<!--* https://kotlinlang.org/docs/reference/kapt.html-->
<!--* https://github.com/JetBrains/kotlin-examples/blob/master/maven/dagger-maven-example/pom.xml-->
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<sourceDirs>
<source>src/main/kotlin</source>
<source>src/main/java</source>
<source>target/generated-sources/annotations</source>
</sourceDirs>
</configuration>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
...
【问题讨论】：
-
我正在按照github.com/FasterXML/jackson-module-kotlin 的指示调用jacksonObjectMapper()。在 .encoder(new JacksonEncoder(jacksonObjectMapper())) 之前，我尝试使用 ObjectMapper mapper = jacksonObjectMapper(); 进行配置JacksonEncoder 编码器 = new JacksonEncoder(mapper); mapper.setPropertyNamingStrategy(new PropertyNamingStrategy()); mapper.registerModule(new KotlinModule());无济于事。
-
MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES 用于传入，所以它不起作用。但是 mapper.configure(USE_STD_BEAN_NAMING, true);看起来它达到了预期的效果，干杯。
-
是的，我只是想知道是否值得调查该属性是否在传出时破坏了某些东西。我一直在查看 2.7.9 和 master 之间的区别，我看到 master 中不再有一个 caveat in 2.7.9：“目前我们在 Kotlin 中使用与 Kotlin M8 到 M11 兼容的参数名称信息”。这能解释问题吗？你能升级 Jackson 和 jackson-module-kotlin 吗？
-
关于 USE_STD_BEAN_NAMING 的好消息。
-
再想一想，我是否明确地必须 mapper.configure(USE_STD_BEAN_NAMING, true);意思是 @JsonProperty("TPID") 实际上仍然被忽略？我应该可以升级了。