SpringBoot整合Scala构建Web服务的方法

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

代码如下:

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

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

 <modelVersion>4.0.0</modelVersion>
 <groupId>com.edurt.ssi</groupId>
 <artifactId>springboot-scala-integration</artifactId>
 <packaging>jar</packaging>
 <version>1.0.0</version>

 <name>springboot-scala-integration</name>
 <description>SpringBoot Scala Integration is a open source springboot, scala integration example.</description>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.3.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
 </parent>

 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <java.version>1.8</java.version>
  <maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
  <!-- dependency config -->
  <dependency.scala.version>2.12.1</dependency.scala.version>
  <!-- plugin config -->
  <plugin.maven.scala.version>3.1.3</plugin.maven.scala.version>
 </properties>

 <dependencies>
  <dependency>
   <groupId>org.scala-lang</groupId>
   <artifactId>scala-library</artifactId>
   <version>${dependency.scala.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
 </dependencies>

 <build>
  <sourceDirectory>${project.basedir}/src/main/scala</sourceDirectory>
  <testSourceDirectory>${project.basedir}/src/test/scala</testSourceDirectory>
  <plugins>
   <plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>scala-maven-plugin</artifactId>
    <version>${plugin.maven.scala.version}</version>
    <executions>
     <execution>
      <goals>
       <goal>compile</goal>
       <goal>testCompile</goal>
      </goals>
     </execution>
    </executions>
   </plugin>
   <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
  </plugins>
 </build>

</project>

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

<!-- mustache -->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-mustache</artifactId>
</dependency>

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

<h1>Hello, Scala</h1>

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)

<!-- data jpa and db -->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
 <groupId>com.h2database</groupId>
 <artifactId>h2</artifactId>
 <scope>runtime</scope>
</dependency>

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

<!-- test -->
<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-test</artifactId>
 <scope>test</scope>
 <exclusions>
  <exclusion>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
  </exclusion>
  <exclusion>
   <groupId>org.mockito</groupId>
   <artifactId>mockito-core</artifactId>
  </exclusion>
 </exclusions>
</dependency>
<dependency>
 <groupId>org.junit.jupiter</groupId>
 <artifactId>junit-jupiter-engine</artifactId>
 <scope>test</scope>
</dependency>

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

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