关注已久的Kotlin语言终于发布1.0.0版本了,参见JetBrains正式发布Kotlin 1.0:JVM和Android上更好用的语言。我看到文章中提到,spring boot社区也及时跟进了对koltin语言的支持,如果这门语言能够消除一些Java中的坑,我觉得可以了解下。
在spring.io找到Developing Spring Boot applications with Kotlin一文,下文是我根据文中的内容进行的实验。
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
<kotlin.version>1.0.0-beta-1103</kotlin.version>
</properties>
@Entity
data class Customer(
var firstName: String = "",
var lastName: String = "",
@Id @GeneratedValue(strategy = GenerationType.AUTO)
var id: Long = 0
)
interface CustomerRepository : CrudRepository<Customer, Long> {
fun findByLastName(name: String): List<Customer>
}
@RestController
class CustomerController @Autowired constructor(val repository: CustomerRepository) {
@RequestMapping("/")
fun findAll() = repository.findAll()
@RequestMapping("/{name}")
fun findByLastName(@PathVariable name: String) = repository.findByLastName(name)
}
@SpringBootApplication
open class KoltinDemoApplication {
@Bean
open fun init(repository: CustomerRepository): CommandLineRunner {
return CommandLineRunner {
repository.save(Customer("Jack", "Bauer"))
repository.save(Customer("Chloe", "O'Brian"))
repository.save(Customer("Kim", "Bauer"))
repository.save(Customer("David", "Palmer"))
repository.save(Customer("Michelle", "Dessler"))
}
}
}
fun main(args: Array<String>) {
SpringApplication.run(KoltinDemoApplication::class.java, *args)
}
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/koltinDemo
spring.datasource.username=root
spring.datasource.password=root
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = create-drop
测试结果1
测试结果2