今天我们尝试Spring Boot整合Scala，并决定建立一个非常简单的Spring Boot微服务，使用Scala作为编程语言进行编码构建。
创建项目
- 初始化项目
mvn archetype:generate -DgroupId=com.edurt.ssi -DartifactId=springboot-scala-integration -DarchetypeArtifactId=maven-archetype-quickstart -Dversion=1.0.0 -DinteractiveMode=false
- 修改pom.xml增加java和scala的支持
4.0.0
com.edurt.ssi
springboot-scala-integration
jar
1.0.0
springboot-scala-integration
SpringBoot Scala Integration is a open source springboot, scala integration example.
org.springframework.boot
spring-boot-starter-parent
2.1.3.RELEASE
UTF-8
UTF-8
1.8
1.8
1.8
2.12.1
3.1.3
org.scala-lang
scala-library
${dependency.scala.version}
org.springframework.boot
spring-boot-starter-web
${project.basedir}/src/main/scala
${project.basedir}/src/test/scala
net.alchim31.maven
scala-maven-plugin
${plugin.maven.scala.version}
compile
testCompile
org.springframework.boot
spring-boot-maven-plugin
- 一个简单的应用类
package com.edurt.ssi
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
@SpringBootApplication
class SpringBootScalaIntegration
object SpringBootScalaIntegration extends App{
SpringApplication.run(classOf[SpringBootScalaIntegration])
}
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,scala输出信息
package com.edurt.ssi.controller
import org.springframework.web.bind.annotation.{GetMapping, RestController}
@RestController
class HelloController {
@GetMapping(value = Array("hello"))
def hello(): String = {
return "hello,scala"
}
}
- 修改SpringBootScalaIntegration文件增加以下设置扫描路径
@ComponentScan(value = Array(
"com.edurt.ssi.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
- 修改SpringBootScalaIntegration文件增加以下设置扫描路径ComponentScan的value字段中
"com.edurt.ssi.view"
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
Hello, Scala
- 创建页面转换器HelloView
package com.edurt.ssi.view
import org.springframework.stereotype.Controller
import org.springframework.web.bind.annotation.GetMapping
@Controller
class HelloView {
@GetMapping(value = Array("hello_view"))
def helloView: 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
- 修改SpringBootScalaIntegration文件增加以下设置扫描model路径
@EntityScan(value = Array(
"com.edurt.ssi.model"
))
- 创建User实体
package com.edurt.ssi.model
import javax.persistence.{Entity, GeneratedValue, Id}
@Entity
class UserModel {
@Id
@GeneratedValue
var id: Long = 0
var name: String = null
}
- 创建UserSupport dao数据库操作工具类
package com.edurt.ssi.support
import com.edurt.ssi.model.UserModel
import org.springframework.data.repository.PagingAndSortingRepository
trait UserSupport extends PagingAndSortingRepository[UserModel, Long] {
}
- 创建UserService服务类
package com.edurt.ssi.service
import com.edurt.ssi.model.UserModel
trait UserService {
/**
* save model to db
*/
def save(model: UserModel): UserModel;
}
- 创建UserServiceImpl实现类
package com.edurt.ssi.service
import com.edurt.ssi.model.UserModel
import com.edurt.ssi.support.UserSupport
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Service
@Service(value = "userService")
class UserServiceImpl @Autowired() (
val userSupport: UserSupport
) extends UserService {
/**
* save model to db
*/
override def save(model: UserModel): UserModel = {
return this.userSupport.save(model)
}
}
- 创建用户UserController进行持久化数据
package com.edurt.ssi.controller
import com.edurt.ssi.model.UserModel
import com.edurt.ssi.service.UserService
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.web.bind.annotation.{PathVariable, PostMapping, RequestMapping, RestController}
@RestController
@RequestMapping(value = Array("user"))
class UserController @Autowired()(
val userService: UserService
) {
@PostMapping(value = Array("save/{name}"))
def save(@PathVariable name: String): Long = {
val userModel = {
new UserModel()
}
userModel.name = name
return this.userService.save(userModel).id
}
}
- 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
1
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
*/
def getAll(page: Pageable): Page[UserModel]
- 修改UserServiceImpl增加以下代码
/**
* get all model
*/
override def getAll(page: Pageable): Page[UserModel] = {
return this.userSupport.findAll(page)
}
- 修改UserController增加以下代码
@GetMapping(value = Array("list"))
def get(): Page[UserModel] = this.userService.getAll(PageRequest.of(0, 10))
- 创建UserView文件渲染User数据
package com.edurt.ssi.view
import com.edurt.ssi.service.UserService
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.data.domain.PageRequest
import org.springframework.stereotype.Controller
import org.springframework.ui.Model
import org.springframework.web.bind.annotation.GetMapping
@Controller
class UserView @Autowired()(
private val userService: UserService
) {
@GetMapping(value = Array("user_view"))
def helloView(model: Model): String = {
model.addAttribute("users", this.userService.getAll(PageRequest.of(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.ssi
import com.edurt.ssi.service.UserService
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
def `get all`() {
println(">> Assert blog page title, content and status code")
val entity = this.userService.getAll(PageRequest.of(0, 1))
print(entity.getTotalPages)
}
}
源码地址：GitHub