Quarkus 是一个目前非常火的 Java 应用开发框架,定位是轻量级的微服务框架。,Quarkus 提供了优秀的容器化整合能力,相较于传统开发框架(Spring Boot)有着更快的启动速度、更小的内存消耗、更短的服务响应。
本文将演示将 SpringBoot 迁移至 Quarkus
Spring Boot 示例程序
使用 JPA 完成 数据库的增删改查操作,基础代码如下
- maven 依赖 - org.springframework.boot - spring-boot-starter-data-jpa - org.springframework.boot - spring-boot-starter-web 
- jpa crud - public interface DemoUserDao extends CrudRepository<DemoUser, Long> { } 
迁移至 Quarkus
- quarkus-bom 管理了全部 quarkus 插件 maven 依赖的版本信息,引入后所有依赖不需要再定义版本。 - <dependencyManagement> <dependencies> <dependency> <groupId>io.quarkus</groupId> <artifactId>quarkus-bom</artifactId> <version>1.10.5.Final</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>
- 迁移 spring-web 、spring-jpa 至 quarkus 技术栈。 - io.quarkus - quarkus-spring-data-jpa - io.quarkus - quarkus-spring-web 
- 配置文件调整 (还是在 application.yml) - quarkus.datasource.db-kind=mysql quarkus.datasource.jdbc.driver=com.mysql.cj.jdbc.Driver quarkus.datasource.username=root quarkus.datasource.password=root quarkus.datasource.jdbc.url=jdbc:mysql://localhost:3306/pig_demo?useUnicode=true&characterEncoding=utf8&autoReconnect=true&rewriteBatchedStatements=TRUE 
- Main 方法调整为 实现 - QuarkusApplication,且需要通过- Quarkus.waitForExit()保持服务运行。- @QuarkusMain public class SimpleApplication implements QuarkusApplication { public static void main(String[] args) { Quarkus.run(SimpleApplication.class,args); } @Override public int run(String... args) { Quarkus.waitForExit(); return 0; } } 
启动运行
main 方法启动, 输出 Quarkus banner
__  ____  __  _____   ___  __ ____  ______
 --/ __ \/ / / / _ | / _ \/ //_/ / / / __/
 -/ /_/ / /_/ / __ |/ , _/ ,< / /_/ /\ \
--\___\_\____/_/ |_/_/|_/_/|_|\____/___/
2021-01-12 22:31:46,341 INFO  [io.qua.arc.pro.BeanProcessor] (build-21) Found unrecommended usage of private members (use package-private instead) in application beans:
    - @Inject field com.example.simple.controller.DemoController#userDao
2021-01-12 22:31:48,702 INFO  [io.quarkus] (Quarkus Main Thread) Quarkus 1.10.5.Final on JVM started in 4.613s. Listening on: http://localhost:8080
2021-01-12 22:31:48,703 INFO  [io.quarkus] (Quarkus Main Thread) Profile dev activated. Live Coding activated.
2021-01-12 22:31:48,703 INFO  [io.quarkus] (Quarkus Main Thread) Installed features: [agroal, cdi, hibernate-orm, hibernate-orm-panache, mutiny, narayana-jta, resteasy, resteasy-jackson, smallrye-context-propagation, spring-data-jpa, spring-di, spring-web]
非常重要的是输出了当前已经安装的功能
Installed features: [agroal, cdi, hibernate-orm, hibernate-orm-panache, mutiny, narayana-jta, resteasy, resteasy-jackson, smallrye-context-propagation, spring-data-jpa, spring-di, spring-web]
【扩展】 actuator 监控迁移
- 添加以下依赖 - io.quarkus - quarkus-smallrye-health 
- 指定访问监控断点路径 - quarkus.smallrye-health.root-path=/actuator/health 
- 访问监控检查断点测试 - curl http://localhost:8080/actuator/health { "status": "UP", "checks": [ { "name": "Database connections health check", "status": "UP" } ] }⏎ 
【扩展】Flyway 迁移
- 添加 quarkus flyway 插件 - io.quarkus - quarkus-flyway 
- 指定插件启动策略即可 - quarkus.flyway.migrate-at-start=true 
 
  
  
  
 
 
  
 
 
 