SpringBoot整合Kotlin构建Web服务的方法示例

SpringBoot整合Kotlin构建Web服务的方法示例

今天我们尝试Spring Boot整合Kotlin，并决定建立一个非常简单的Spring Boot微服务，使用Kotlin作为编程语言进行编码构建。

创建一个简单的Spring Boot应用程序。我会在这里使用maven构建项目：

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.edurt.ski

springboot-kotlin-integration

1.0.0

jar

springboot kotlin integration

SpringBoot Kotlin Integration is a open source springboot, kotlin integration example.

org.springframework.boot

spring-boot-starter-parent

2.1.3.RELEASE

UTF-8

UTF-8

1.8

1.2.71

org.springframework.boot

spring-boot-starter-web

com.fasterxml.jackson.module

jackson-module-kotlin

org.jetbrains.kotlin

kotlin-stdlib-jdk8

org.jetbrains.kotlin

kotlin-reflect

${project.basedir}/src/main/kotlin

${project.basedir}/src/test/kotlin

org.springframework.boot

spring-boot-maven-plugin

kotlin-maven-plugin

org.jetbrains.kotlin

-Xjsr305=strict

spring

jpa

all-open

all-open:annotation=javax.persistence.Entity

org.jetbrains.kotlin

kotlin-maven-allopen

${plugin.maven.kotlin.version}

org.jetbrains.kotlin

kotlin-maven-noarg

${plugin.maven.kotlin.version}

kapt

kapt

src/main/kotlin

org.springframework.boot

spring-boot-configuration-proceshttp://sor

${project.parent.version}

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.edurt.ski

springboot-kotlin-integration

1.0.0

jar

springboot kotlin integration

SpringBoot Kotlin Integration is a open source springboot, kotlin integration example.

org.springframework.boot

spring-boot-starter-parent

2.1.3.RELEASE

UTF-8

UTF-8

1.8

1.2.71

org.springframework.boot

spring-boot-starter-web

com.fasterxml.jackson.module

jackson-module-kotlin

org.jetbrains.kotlin

kotlin-stdlib-jdk8

org.jetbrains.kotlin

kotlin-reflect

${project.basedir}/src/main/kotlin

${project.basedir}/src/test/kotlin

org.springframework.boot

spring-boot-maven-plugin

kotlin-maven-plugin

org.jetbrains.kotlin

-Xjsr305=strict

spring

jpa

all-open

all-open:annotation=javax.persistence.Entity

org.jetbrains.kotlin

kotlin-maven-allopen

${plugin.maven.kotlin.version}

org.jetbrains.kotlin

kotlin-maven-noarg

${plugin.maven.kotlin.version}

kapt

kapt

src/main/kotlin

org.springframework.boot

spring-boot-configuration-proceshttp://sor

${project.parent.version}

添加所有必需的依赖项：

kotlin-stdlib-jdk8 kotlin jdk8的lib包

kotlin-reflect kotlin反射包

一个简单的应用类：

package com.edurt.ski

import org.springframework.boot.autoconfigure.SpringBootApplication

import org.springframework.boot.runApplication

@SpringBootApplication

class SpringBootKotlinIntegration

fun main(args: Array) {

runApplication(*args)

}

添加Rest API接口功能

创建一个HelloController Rest API接口,我们只提供一个简单的get请求获取hello,kotlin输出信息:

package com.edurt.ski.controller

import org.springframework.web.bind.annotation.GetMapping

import org.springframework.web.bind.annotation.RestController

@RestController

class HelloController {

@GetMapping(value = "hello")

fun hello(): String {

return "hello,kotlin"

}

}

修改SpringBootKotlinIntegration文件增加以下设置扫描路径

@ComponentScan(value = [

"com.edurt.ski",

"com.edurt.ski.controller"

])

添加页面功能

修改pom.xml文件增加以下页面依赖

org.springframework.boot

spring-boot-starter-mustache

在src/main/resources路径下创建templates文件夹

在templates文件夹下创建一个名为hello.mustache的页面文件

创建页面转换器HelloView

package com.edurt.ski.view

import org.springframework.stereotype.Controller

import org.springframework.ui.Model

import org.springframework.web.bind.annotation.GetMapping

@Controller

class HelloView {

@GetMapping(value = "hello_view")

fun helloView(model: Model): String {

return "hello"

}

}

浏览器访问http://localhost:8080/hello_view即可看到页面内容

添加数据持久化功能

修改pom.xml文件增加以下依赖(由于测试功能我们使用h2内存数据库)

org.springframework.boot

spring-boot-starter-data-jpa

com.h2database

h2

runtime

创建User实体

package com.edurt.ski.model

import javax.persistence.Entity

import javax.persistence.GeneratedValue

import javax.persistence.Id

@Entity

//class UserModel(

// @Id

// @GeneratedValue

// private var id: Long? = 0,

// private var name: String

//)

class UserModel {

@Id

@GeneratedValue

var id: Long? = 0

get() = field

set

var name: String? = null

get() = field

set

}

创建UserSupport dao数据库操作工具类

package com.edurt.ski.support

import com.edurt.ski.model.UserModel

import org.springframework.data.repository.PagingAndSortingRepository

interface UserSupport : PagingAndSortingRepository {

}

创建UserService服务类

package com.edurt.ski.service

import com.edurt.ski.model.UserModel

interface UserService {

/**

* save model to db

*/

fun save(model: UserModel): UserModel

}

创建UserServiceImpl实现类

package com.edurt.ski.service

import com.edurt.ski.model.UserModel

import com.edurt.ski.support.UserSupport

import org.springframework.stereotype.Service

@Service(value = "userService")

class UserServiceImpl(private val userSupport: UserSupport) : UserService {

override fun save(model: UserModel): UserModel {

return this.userSupport.save(model)

}

}

创建用户UserController进行持久化数据

package com.edurt.ski.controller

import com.edurt.ski.model.UserModel

import com.edurt.ski.service.UserService

import org.springframework.web.bind.annotation.PathVariable

import org.springframework.web.bind.annotation.PostMapping

import org.springframework.web.bind.annotation.RequestMapping

import org.springframework.web.bind.annotation.RestController

@RestController

@RequestMapping(value = "user")

class UserController(private val userService: UserService) {

@PostMapping(value = "save/{name}")

fun save(@PathVariable name: String): UserModel {

val userModel = UserModel()

// userModel.id = 1

userModel.name = name

return this.userService.save(userModel)

}

}

使用控制台窗口执行以下命令保存数据

curl -X POST http://localhost:8080/user/save/qianmoQ

收到返回结果

{"id":1,"name":"qianmoQ"}

表示数据保存成功

增加数据读取渲染功能

修改UserService增加以下代码

/**

* get all model

*/

fun getAll(page: Pageable): Page

修改UserServiceImpl增加以下代码

override fun getAll(page: Pageable): Page {

return this.userSupport.findAll(page)

}

修改UserController增加以下代码

@GetMapping(value = "list")

fun get(): Page = this.userService.getAll(PageRequest(0, 10))

创建UserView文件渲染User数据

package com.edurt.ski.view

import com.edurt.ski.service.UserService

import org.springframework.data.domain.PageRequest

import org.springframework.pLyXpfbVHrstereotype.Controller

import org.springframework.ui.Model

import org.springframework.ui.set

import org.springframework.web.bind.annotation.GetMapping

@Controller

class UserView(private val userService: UserService) {

@GetMapping(value = "user_view")

fun helloView(model: Model): String {

model["users"] = this.userService.getAll(PageRequest(0, 10))

return "user"

}

}

创建user.mustache文件渲染数据(自行解析返回数据即可)

{{users}}

浏览器访问http://localhost:8080/user_view即可看到页面内容

增加单元功能

修改pom.xml文件增加以下依赖

org.springframework.boot

spring-boot-starter-test

test

junit

junit

org.mockito

mockito-core

org.junit.jupiter

junit-jupiter-engine

test

创建UserServiceTest文件进行测试UserService功能

package com.edurt.ski

import com.edurt.ski.service.UserService

import org.junit.jupiter.api.AfterAll

import org.junit.jupiter.api.Test

import org.springframework.beans.factory.annotation.Autowired

import org.springframework.boot.test.context.SpringBootTest

import org.springframework.data.domain.PageRequest

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

class UserServiceTest(@Autowired private val userService: UserService) {

@Test

fun `get all`() {

println(">> Assert blog page title, content and status code")

val entity = this.userService.getAll(PageRequest(0, 1))

print(entity.totalPages)

}

}

源码地址：github

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