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fabiotadashifabiotadashi
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ktor and thymeleaf app
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+374
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‎kotlin-ktor/build.gradle.kts

Lines changed: 9 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,9 @@ description = "Example usage of Gradle plugin to generate GraphQL Kotlin Client"
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val graphQLKotlinVersion = "7.0.1"
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val ktorVersion = "2.3.5"
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val logbackVersion = "1.4.14"
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val kotlinTestUnit = "1.9.10"
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val seleniumVersion = "4.16.1"
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repositories {
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mavenCentral()
@@ -18,10 +21,15 @@ dependencies {
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implementation("io.ktor", "ktor-server-netty", ktorVersion)
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implementation("io.ktor", "ktor-server-websockets", ktorVersion)
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implementation("io.ktor", "ktor-server-thymeleaf-jvm", ktorVersion)
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implementation("ch.qos.logback","logback-classic", logbackVersion)
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testImplementation("io.ktor", "ktor-server-tests", ktorVersion)
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testImplementation("io.ktor", "ktor-client-content-negotiation", ktorVersion)
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testImplementation("io.ktor", "ktor-serialization-kotlinx-json", ktorVersion)
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testImplementation("org.jetbrains.kotlin", "kotlin-test-junit", "1.9.10")
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testImplementation("org.jetbrains.kotlin", "kotlin-test-junit", kotlinTestUnit)
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testImplementation("org.seleniumhq.selenium", "selenium-java", seleniumVersion)
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}
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plugins {

‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/data/DataHolder.kt

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package com.baeldung.thymeleaf.data
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import io.ktor.http.*
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object DataHolder {
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fun getStudentList() = studentsList
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fun findStudentById(id: String?) = getStudentList().first { student -> student.id == id }
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fun updateGrades(studentId: String?, parameters: Parameters) {
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findStudentById(studentId)
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.gradeList.forEach { grade ->
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grade.apply {
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value = parameters[grade.id] ?: "F"
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}
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}
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}
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private val studentsList = listOf(
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Student(
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id = "1",
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firstName = "Michael",
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lastName = "Smith",
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gradeList = createGradeList()
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),
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Student(
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id = "2",
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firstName = "Mary",
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lastName = "Johnson",
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gradeList = createGradeList()
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),
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Student(
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id = "3",
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firstName = "John",
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lastName = "Doe",
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gradeList = createGradeList()
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),
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)
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private fun createGradeList() = listOf(
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Grade(id = "1", subject = "Reading"),
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Grade(id = "2", subject = "Writing"),
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Grade(id = "3", subject = "Science"),
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Grade(id = "4", subject = "Mathematics"),
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)
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}

‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/data/Grade.kt

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package com.baeldung.thymeleaf.data
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data class Grade (
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val id: String,
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val subject: String,
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var value: String = String()
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)

‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/data/Student.kt

Lines changed: 14 additions & 0 deletions
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@@ -0,0 +1,14 @@
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package com.baeldung.thymeleaf.data
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data class Student(
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val id: String,
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val firstName: String,
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val lastName: String,
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val gradeList: List<Grade>,
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) {
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val fullName: String
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get() = "$firstName $lastName"
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val hasAllGrades: Boolean
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get() = gradeList.firstOrNull { grade -> grade.value.isBlank() } == null
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}

‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/server/ThymeleafKtorApplication.kt

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package com.baeldung.thymeleaf.server
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import com.baeldung.thymeleaf.server.plugins.configureRouting
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import com.baeldung.thymeleaf.server.plugins.configureTemplating
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import io.ktor.server.engine.*
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import io.ktor.server.netty.*
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fun main() {
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embeddedServer(Netty, port = 8080, host = "0.0.0.0") {
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configureTemplating()
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configureRouting()
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}.start(wait = true)
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}
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‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/server/plugins/Routing.kt

Lines changed: 24 additions & 0 deletions
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package com.baeldung.thymeleaf.server.plugins
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import com.baeldung.thymeleaf.data.DataHolder
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import io.ktor.server.application.*
5+
import io.ktor.server.request.*
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import io.ktor.server.response.*
7+
import io.ktor.server.routing.*
8+
import io.ktor.server.thymeleaf.*
9+
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fun Application.configureRouting() {
11+
routing {
12+
get("/") {
13+
call.respond(ThymeleafContent("index", mapOf("studentList" to DataHolder.getStudentList())))
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}
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get("/report-card/{id}") {
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call.respond(ThymeleafContent("report-card", mapOf("student" to DataHolder.findStudentById(call.parameters["id"]))))
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}
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post("/report-card/{id}") {
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val parameters = call.receiveParameters()
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DataHolder.updateGrades(call.parameters["id"], parameters)
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call.respondRedirect("/", false)
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}
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}
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}

‎kotlin-ktor/src/main/java/com/baeldung/thymeleaf/server/plugins/Templating.kt

Lines changed: 15 additions & 0 deletions
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package com.baeldung.thymeleaf.server.plugins
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import io.ktor.server.application.*
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import io.ktor.server.thymeleaf.*
5+
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver
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fun Application.configureTemplating() {
8+
install(Thymeleaf) {
9+
setTemplateResolver(ClassLoaderTemplateResolver().apply {
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prefix = "templates/"
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suffix = ".html"
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characterEncoding = "utf-8"
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})
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}
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}

‎kotlin-ktor/src/main/resources/templates/index.html

Lines changed: 25 additions & 0 deletions
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<!DOCTYPE html >
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="UTF-8">
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<title>Students</title>
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<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
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rel="stylesheet"
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integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN"
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crossorigin="anonymous">
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</head>
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<body>
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<div class="container">
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<h2>Students</h2>
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<ul th:each="student : ${studentList}" class="list-group">
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<a th:href="@{'report-card/'+${student.id}}"
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th:text="${student.fullName}"
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th:classappend="${student.hasAllGrades} ? list-group-item-success : list-group-item-warning"
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class="list-group-item list-group-item-action"/>
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</ul>
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</div>
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<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"
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integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL"
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crossorigin="anonymous"/>
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</body>
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</html>

‎kotlin-ktor/src/main/resources/templates/report-card.html

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<!DOCTYPE html >
2+
<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="UTF-8">
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<title>Report Card</title>
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<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
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rel="stylesheet"
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integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN"
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crossorigin="anonymous">
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</head>
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<body>
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<div class="container">
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<form action="#" th:action="@{'~/report-card/'+${student.id}}" method="post">
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<h3>Name: <span th:text="${student.fullName}"/></h3>
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<table class="table table-striped">
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<thead>
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<tr>
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<th>Subject</th>
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<th>Grade</th>
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</tr>
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</thead>
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<tbody>
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<tr th:each="grade : ${student.gradeList}">
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<td th:text="${grade.subject}"></td>
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<td><input type="text" th:attr="value = ${grade.value}" th:name="${grade.id}"></td>
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</tr>
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</tbody>
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</table>
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<button type="submit" class="btn btn-primary">Submit</button>
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</form>
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</div>
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<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"
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integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL"
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crossorigin="anonymous"/>
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</body>
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</html>

‎kotlin-ktor/src/test/java/com/baeldung/thymeleaf/data/DataHolderUnitTest.kt

Lines changed: 48 additions & 0 deletions
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package com.baeldung.thymeleaf.data
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3+
import io.ktor.http.*
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import kotlin.test.Test
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import kotlin.test.assertEquals
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import kotlin.test.assertNotNull
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class DataHolderUnitTest {
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10+
@Test
11+
fun `when getStudentList is called then should retrieve a list`(){
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val studentList = DataHolder.getStudentList()
13+
14+
assertEquals(3, studentList.size)
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}
16+
17+
@Test
18+
fun `when findStudentById is called then should return a specific Student`(){
19+
val student = DataHolder.findStudentById("2")
20+
21+
assertEquals("2", student.id)
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assertEquals("Mary", student.firstName)
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assertEquals("Johnson", student.lastName)
24+
assertNotNull(student.gradeList)
25+
assertEquals(4, student.gradeList.size)
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}
27+
28+
@Test
29+
fun `when updateGrades is called then should update grades for a specific Student`(){
30+
val parameters = ParametersBuilder()
31+
.apply {
32+
append("1", "A")
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append("2", "B")
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append("3", "C")
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append("4", "D")
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}.build()
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DataHolder.updateGrades("1", parameters)
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val student = DataHolder.findStudentById("1")
41+
assertNotNull(student.gradeList)
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assertEquals("A", student.gradeList.first { it.id == "1" }.value)
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assertEquals("B", student.gradeList.first { it.id == "2" }.value)
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assertEquals("C", student.gradeList.first { it.id == "3" }.value)
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assertEquals("D", student.gradeList.first { it.id == "4" }.value)
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}
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48+
}

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