參考資料
SpringBoot（maven）專案接入Kotlin與Java混合開發
maven如何編譯java和kotlin編碼的混合專案
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.laolang.thresh</groupId>
<artifactId>thresh-boot</artifactId>
<version>0.1</version>
<packaging>jar</packaging>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<springboot.version>2.2.13.RELEASE</springboot.version>
<tlog.version>1.5.0</tlog.version>
<!-- 設定kotlin版本 -->
<kotlin.version>1.3.72</kotlin.version>
<!-- 啟用kotlin增量編譯 -->
<kotlin.compiler.incremental>true</kotlin.compiler.incremental>
<maven-compiler-plugin.version>3.11.0</maven-compiler-plugin.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${springboot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.yomahub</groupId>
<artifactId>tlog-web-spring-boot-starter</artifactId>
<version>${tlog.version}</version>
</dependency>
<!-- kotlin -->
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-reflect</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.module</groupId>
<artifactId>jackson-module-kotlin</artifactId>
<exclusions>
<exclusion>
<artifactId>kotlin-reflect</artifactId>
<groupId>org.jetbrains.kotlin</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<resources>
<resource>
<directory>src/main/resources/</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<configuration>
<jvmTarget>1.8</jvmTarget>
<args>
<arg>-Xjsr305=strict</arg>
</args>
<compilerPlugins>
<!-- Spring使用動態代理需要所有Bean可繼承，該外掛為所有Bean新增open關鍵字 -->
<plugin>spring</plugin>
<!-- 該外掛為jpa實體類解決沒有無參構造器的問題 -->
<!-- <plugin>jpa</plugin> -->
<plugin>no-arg</plugin>
</compilerPlugins>
<pluginOptions>
<!-- 有些持久層框架需要實體類需要無參構造器，使用該註解標註解決kotlin data class沒有無參構造器的問題 -->
<option>no-arg:annotation=com.example.annotations.NoArg</option>
</pluginOptions>
</configuration>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-allopen</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-noarg</artifactId>
<version>${kotlin.version}</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
<executions>
<!-- 替換會被 maven 特別處理的 default-compile -->
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
<!-- 替換會被 maven 特別處理的 default-testCompile -->
<execution>
<id>default-testCompile</id>
<phase>none</phase>
</execution>
<execution>
<id>java-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>java-test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>testCompile</goal>
</goals>
<configuration>
<skip>true</skip>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${springboot.version}</version>
<executions>
<execution>
<goals>
<goal>repackage</goal> <!-- 將引入的 jar 打入其中 -->
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>public</id>
<name>aliyun nexus</name>
<url>https://maven.aliyun.com/repository/public</url>
<releases>
<enabled>true</enabled>
</releases>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>public</id>
<name>aliyun nexus</name>
<url>https://maven.aliyun.com/repository/public</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
Application
package com.laolang.thresh;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@Slf4j
@SpringBootApplication
public class ThreshApplication {
public static void main(String[] args) {
SpringApplication.run(ThreshApplication.class, args);
log.info("thresh is running...");
}
}
JavaDemoController
package com.laolang.thresh.controller.java;
import com.laolang.thresh.domain.R;
import java.util.HashMap;
import java.util.Map;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@Slf4j
@RequestMapping("java")
@RestController
public class JavaDemoController {
@GetMapping("hello")
public R<Map<String, Object>> hello() {
log.info("java hello");
Map<String, Object> map = new HashMap<>(1);
map.put("msg", "Hello World");
return R.ok(map);
}
}
KotlinDemoController
package com.laolang.thresh.controller.kotlin
import com.laolang.thresh.domain.R
import org.slf4j.LoggerFactory
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RestController
@RequestMapping("kotlin")
@RestController
class KotlinDemoController {
private val log = LoggerFactory.getLogger(KotlinDemoController::class.java)
@GetMapping("hello")
fun hello(): R<Map<String, Any>> {
log.info("kotlin hello")
val map = hashMapOf<String, Any>("msg" to "Hello World")
return R.ok(map)
}
}
注意
kotlin 版本為 1.3.72 , 是經過驗證的,其他版本可能會有問題, 比如:
java.lang.NoSuchMethodError: kotlin.collections.MapsKt.createMapBuilder()Ljava/util/Map;