Kotlin開發springboot項目（三）

在線工具

https://www.sojson.com

IDEA中Kotlin生成可執行文件
1，項目使用Gradle構建
2，在model的build.gradle中添加插件： apply plugin: 'application' mainClassName = "net.println.kotlin.HelloKt"     //注意文件名Kt結尾 3，在ide右側：Gradle->model name->Tasks->distribution->installDist雙擊即可執行任務
4，構建完畢，在./build/install/{modelName}/bin/下會生成bash腳本和bat腳本

 

 

高階函數有點和 scale 的類似

forEach,map,flatmap,fold,reduce,filter,takeWhile,let,apply,with,use

 

 

 領域特定語言DSL

專門解決某一特定問題的計算機語言，比如大家耳熟能詳的 SQL 和正則表達式。

 

協成Coroutine

 

 

 java與kotlin互操作

 

kotlin編寫腳本

創建HelloWorld.kts

import java.io.File println("HelloWorld") File(".").list().forEach(::println)

 

kotlin整合springboot

http://blog.720ui.com/2018/springboot2_kotlin_prime/

環境依賴

修改 POM 文件，添加 spring boot 依賴。

<?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.kotlin.springboot</groupId>
 <artifactId>sb-demo</artifactId>
 <version>1.0-SNAPSHOT</version>

 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.0.2.RELEASE</version>
 <relativePath/>
 </parent>
 <dependencies>
 <!-- 基礎依賴 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-jdbc</artifactId>
 </dependency>

 <!-- 數據庫配置 -->
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <version>5.1.35</version>
 </dependency>
 <dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid</artifactId>
 <version>1.0.14</version>
 </dependency>

 <!-- kotlin配置 -->
 <dependency>
 <groupId>org.jetbrains.kotlin</groupId>
 <artifactId>kotlin-stdlib-jdk8</artifactId>
 </dependency>
 <dependency>
 <groupId>org.jetbrains.kotlin</groupId>
 <artifactId>kotlin-reflect</artifactId>
 </dependency>
 <dependency>
 <groupId>org.jetbrains.kotlin</groupId>
 <artifactId>kotlin-stdlib</artifactId>
 </dependency>
 </dependencies>

 <build>
 <plugins>
 <plugin>
 <artifactId>kotlin-maven-plugin</artifactId>
 <groupId>org.jetbrains.kotlin</groupId>
 <version>${kotlin.version}</version>
 <executions>
 <execution>
 <id>compile</id>
 <goals> <goal>compile</goal> </goals>
 </execution>
 <execution>
 <id>test-compile</id>
 <goals> <goal>test-compile</goal> </goals>
 </execution>
 </executions>
 <dependencies>
 <dependency>
 <groupId>org.jetbrains.kotlin</groupId>
 <artifactId>kotlin-maven-noarg</artifactId>
 <version>${kotlin.version}</version>
 </dependency>
 <dependency>
 <groupId>org.jetbrains.kotlin</groupId>
 <artifactId>kotlin-maven-allopen</artifactId>
 <version>${kotlin.version}</version>
 </dependency>
 </dependencies>
 </plugin>
 </plugins>
 </build>
</project>

腳本初始化

先初始化需要用到的 SQL 腳本。

    CREATE DATABASE /*!32312 IF NOT EXISTS*/`springboot_db` /*!40100 DEFAULT CHARACTER SET utf8 */; USE `springboot_db`; DROP TABLE IF EXISTS `t_author`; CREATE TABLE `t_author` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '用戶ID', `real_name` varchar(32) NOT NULL COMMENT '用戶名稱', `nick_name` varchar(32) NOT NULL COMMENT '用戶匿名', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;