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kotlin里获取属性注解首先引入反射依赖：
<dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-reflect</artifactId> </dependency>
完整：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.7.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.ruben</groupId> <artifactId>simple-kotlin</artifactId> <version>0.0.1-SNAPSHOT</version> <name>simple-kotlin</name> <description>simple-kotlin</description> <properties> <java.version>1.8</java.version> <kotlin.version>1.7.21</kotlin.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-reflect</artifactId> </dependency> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-stdlib-jdk8</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory> <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <plugin> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-maven-plugin</artifactId> <configuration> <args> <arg>-Xjsr305=strict</arg> </args> <compilerPlugins> <plugin>spring</plugin> </compilerPlugins> </configuration> <dependencies> <dependency> <groupId>org.jetbrains.kotlin</groupId> <artifactId>kotlin-maven-allopen</artifactId> <version>${kotlin.version}</version> </dependency> </dependencies> </plugin> </plugins> </build> </project>
然后定义注解、data对象
package com.ruben.simplekotlin @Target(AnnotationTarget.PROPERTY) annotation class TestAnnotation(val value: String)
package com.ruben.simplekotlin data class TestEntity( @TestAnnotation("主键") val id: Long, @TestAnnotation("名称") val name: String )
最后是代码：
package com.ruben.simplekotlin import org.junit.jupiter.api.Assertions import org.junit.jupiter.api.Test import org.springframework.boot.test.context.SpringBootTest import kotlin.reflect.full.findAnnotation import kotlin.reflect.full.memberProperties @SpringBootTest class SimpleKotlinApplicationTests { @Test fun contextLoads() { val annotations = TestEntity::class.memberProperties.mapNotNull { it.findAnnotation<TestAnnotation>()?.value } Assertions.assertFalse(annotations.isEmpty()) } }
