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：
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<?xml version="1.0" encoding="utf-8"?><project xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xmlns="http://maven.apache.org/pom/4.0.0" xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelversion>4.0.0</modelversion> <groupid>com.edurt.ski</groupid> <artifactid>springboot-kotlin-integration</artifactid> <version>1.0.0</version> <packaging>jar</packaging> <name>springboot kotlin integration</name> <description>springboot kotlin integration is a open source springboot, kotlin 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> <!-- plugin config --> <plugin.maven.kotlin.version>1.2.71</plugin.maven.kotlin.version> </properties> <dependencies> <!-- spring boot --> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency> <!-- kotlin --> <dependency> <groupid>com.fasterxml.jackson.module</groupid> <artifactid>jackson-module-kotlin</artifactid> </dependency> <dependency> <groupid>org.jetbrains.kotlin</groupid> <artifactid>kotlin-stdlib-jdk8</artifactid> </dependency> <dependency> <groupid>org.jetbrains.kotlin</groupid> <artifactid>kotlin-reflect</artifactid> </dependency> </dependencies> <build> <sourcedirectory>${project.basedir}/src/main/kotlin</sourcedirectory> <testsourcedirectory>${project.basedir}/src/test/kotlin</testsourcedirectory> <plugins> <plugin> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-maven-plugin</artifactid> </plugin> <plugin> <artifactid>kotlin-maven-plugin</artifactid> <groupid>org.jetbrains.kotlin</groupid> <configuration> <args> <arg>-xjsr305=strict</arg> </args> <compilerplugins> <plugin>spring</plugin> <plugin>jpa</plugin> <plugin>all-open</plugin> </compilerplugins> <pluginoptions> <option>all-open:annotation=javax.persistence.entity</option> </pluginoptions> </configuration> <dependencies> <dependency> <groupid>org.jetbrains.kotlin</groupid> <artifactid>kotlin-maven-allopen</artifactid> <version>${plugin.maven.kotlin.version}</version> </dependency> <dependency> <groupid>org.jetbrains.kotlin</groupid> <artifactid>kotlin-maven-noarg</artifactid> <version>${plugin.maven.kotlin.version}</version> </dependency> </dependencies> <executions> <execution> <id>kapt</id> <goals> <goal>kapt</goal> </goals> <configuration> <sourcedirs> <sourcedir>src/main/kotlin</sourcedir> </sourcedirs> <annotationprocessorpaths> <annotationprocessorpath> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-configuration-processor</artifactid> <version>${project.parent.version}</version> </annotationprocessorpath> </annotationprocessorpaths> </configuration> </execution> </executions> </plugin> </plugins> </build></project> |
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：
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package com.edurt.skiimport org.springframework.boot.autoconfigure.springbootapplicationimport org.springframework.boot.runapplication@springbootapplicationclass springbootkotlinintegrationfun main(args: array<string>) { runapplication<springbootkotlinintegration>(*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:
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package com.edurt.ski.controllerimport org.springframework.web.bind.annotation.getmappingimport org.springframework.web.bind.annotation.restcontroller@restcontrollerclass 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
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@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
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<!-- mustache --><dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-mustache</artifactid></dependency> |
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
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<h1>hello, kotlin</h1> |
创建页面转换器helloview
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package com.edurt.ski.viewimport org.springframework.stereotype.controllerimport org.springframework.ui.modelimport org.springframework.web.bind.annotation.getmapping@controllerclass 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)
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<!-- 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> |
创建user实体
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package com.edurt.ski.modelimport javax.persistence.entityimport javax.persistence.generatedvalueimport 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
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package com.edurt.ski.supportimport com.edurt.ski.model.usermodelimport org.springframework.data.repository.pagingandsortingrepositoryinterface usersupport : pagingandsortingrepository<usermodel, long> {} |
创建userservice服务类
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package com.edurt.ski.serviceimport com.edurt.ski.model.usermodelinterface userservice { /** * save model to db */ fun save(model: usermodel): usermodel} |
创建userserviceimpl实现类
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package com.edurt.ski.serviceimport com.edurt.ski.model.usermodelimport com.edurt.ski.support.usersupportimport 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
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package com.edurt.ski.controllerimport com.edurt.ski.model.usermodelimport com.edurt.ski.service.userserviceimport org.springframework.web.bind.annotation.pathvariableimport org.springframework.web.bind.annotation.postmappingimport org.springframework.web.bind.annotation.requestmappingimport 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
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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
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/** * get all model */fun getall(page: pageable): page<usermodel> |
修改userserviceimpl增加以下代码
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override fun getall(page: pageable): page<usermodel> { return this.usersupport.findall(page)} |
修改usercontroller增加以下代码
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@getmapping(value = "list")fun get(): page<usermodel> = this.userservice.getall(pagerequest(0, 10)) |
创建userview文件渲染user数据
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package com.edurt.ski.viewimport com.edurt.ski.service.userserviceimport org.springframework.data.domain.pagerequestimport org.springframework.stereotype.controllerimport org.springframework.ui.modelimport org.springframework.ui.setimport org.springframework.web.bind.annotation.getmapping@controllerclass 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)
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{{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
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<!-- 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
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package com.edurt.skiimport com.edurt.ski.service.userserviceimport org.junit.jupiter.api.afterallimport org.junit.jupiter.api.testimport org.springframework.beans.factory.annotation.autowiredimport org.springframework.boot.test.context.springboottestimport 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
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000018224145
