Kotlin 一條龍 - 打造全平台應用
0 likes431 views
The document provides an overview of the Ktor web framework by JetBrains, detailing its asynchronous capabilities for server and client development using Kotlin. It includes information on dependencies, API routes for task management (GET, POST, PATCH, DELETE), and integrates with the Exposed SQL framework to manage tasks in a database. Additionally, it covers Gradle build configurations and the use of Gson for JSON content negotiation.
![API
—
{
"data": [
{
"id": "...UUID...",
"title": "...",
"description": "...",
"completed": true
}
]
}](https://image.slidesharecdn.com/full-stack-development-with-kotlin-200818094450/85/Kotlin-3-320.jpg)
![—
patch("/api/tasks/{id}/complete") {
val id = UUID.fromString(call.parameters["id"])
val data = transaction {
val task = Task.findById(id)
if (task != null) {
task.completed = true
} else {
throw ModelNotFoundException()
}
}
call.respond(mapOf("data" to data))
}](https://image.slidesharecdn.com/full-stack-development-with-kotlin-200818094450/85/Kotlin-21-320.jpg)
![—
delete("/api/tasks/{id}/delete") {
val id = UUID.fromString(call.parameters["id"])
transaction {
val task = Task.findById(id)
if (task != null) {
task.delete()
} else {
throw ModelNotFoundException()
}
}
call.respond(HttpStatusCode.NoContent)
}](https://image.slidesharecdn.com/full-stack-development-with-kotlin-200818094450/85/Kotlin-22-320.jpg)
Kotlin 一條龍 - 打造全平台應用
- 2. —
- 3. API — { "data": [ { "id": "...UUID...", "title": "...", "description": "...", "completed": true } ] }
- 4. Ktor — https://ktor.io/ • Web Framework • Asynchronous • Servers + Clients • Developed by JetBrains • Open Source (Apache 2.0)
- 8. — // gradle.properties exposed_version=0.21.1 h2_version=1.4.200 // build.gradle dependencies { //... // Exposed SQL Library implementation "org.jetbrains.exposed:exposed-core:$ver" implementation "org.jetbrains.exposed:exposed-dao:$ver" implementation "org.jetbrains.exposed:exposed-jdbc:$ver" implementation "org.jetbrains.exposed:exposed-jodatime:$ver" // H2 database implementation "com.h2database:h2:$ver" }
- 9. DAO — object Tasks : UUIDTable() { val title = varchar("title", 255) val description = text("description") var completed = bool("completed") val createdAt = datetime("created_at") val updatedAt = datetime("updated_at") } class Task(id: EntityID<UUID>) : UUIDEntity(id) { companion object : UUIDEntityClass<Task>(Tasks) var title by Tasks.title var description by Tasks.description var completed by Tasks.completed var createdAt by Tasks.createdAt var updatedAt by Tasks.updatedAt }
- 10. — data class TaskResponse ( val id:UUID, val title: String, val description: String, val completed: Boolean )
- 11. Ktor Feature — Client Ktor App HTTP Server Feature Feature Feature
- 12. — // build.gradle dependencies { //... // GSON implementation "io.ktor:ktor-gson:$ver" }
- 14. — Database.connect( url = "...", driver = "..." )
- 15. — transaction { SchemaUtils.create(Tasks) } transaction { for (i in 1..10) { val task = Task.new { title = "Task $i" description = "..." completed = false createdAt = DateTime.now() updatedAt = DateTime.now() } } }
- 18. val tasks = transaction { Task.all().map { TaskResponse( it.id.value, it.title, it.description, it.completed, it.createdAt.toString("..."), it.updatedAt.toString("...") ) } } —
- 19. Data Class — get("/api/tasks") { // ... call.respond(mapOf("data" to tasks)) }
- 20. — post("/api/tasks") { val request = call.receive<TaskRequest>() val data = transaction { val task = Task.new { title = request.title description = request.description completed = false createdAt = DateTime.now() updatedAt = DateTime.now() } // ... } call.respond(mapOf("data" to data)) }
- 21. — patch("/api/tasks/{id}/complete") { val id = UUID.fromString(call.parameters["id"]) val data = transaction { val task = Task.findById(id) if (task != null) { task.completed = true } else { throw ModelNotFoundException() } } call.respond(mapOf("data" to data)) }
- 22. — delete("/api/tasks/{id}/delete") { val id = UUID.fromString(call.parameters["id"]) transaction { val task = Task.findById(id) if (task != null) { task.delete() } else { throw ModelNotFoundException() } } call.respond(HttpStatusCode.NoContent) }
- 23. — // build.gradle plugins { id 'com.google.cloud.tools.jib' version '2.2.0' } $ gradle jib --image=<MY IMAGE> https://github.com/GoogleContainerTools/jib
- 24. — • Ktor • Application Call Request & Response • Routing • API (JSON) • Exposed DB