micronaut 学习 二 创建一个简单的服务
micronaut 提供的cli 很方便，我们可以快速创建具有所需特性的应用，以下是一个简单的web server app
创建命令
mn create-app hello-world效果
mn create-app hello-world| Generating Java project...| Application created at /Users/dalong/mylearning/micronaut-project/hello-world启动服务
./gradlew run添加简单代码
src/main/java/hello/world/HelloController.java
package hello.world;import io.micronaut.http.MediaType;import io.micronaut.http.annotation.Controller;import io.micronaut.http.annotation.Get;@Controller("/hello") public class HelloController { @Get(produces = MediaType.TEXT_PLAIN) public String index() { return "Hello World"; }} 访问效果
curl http://localhost:8080/helloHello World%集成测试
- 测试controller
使用httpclient
package hello.world;import io.micronaut.context.annotation.Property;import io.micronaut.http.HttpRequest;import io.micronaut.http.client.HttpClient;import io.micronaut.http.client.annotation.Client;import io.micronaut.runtime.server.EmbeddedServer;import io.micronaut.test.annotation.MicronautTest;import org.junit.jupiter.api.Test;import javax.inject.Inject;import static org.junit.jupiter.api.Assertions.assertEquals;@MicronautTestclass HelloControllerSpec { @Inject EmbeddedServer server; @Inject @Client("/") HttpClient client; @Test void testHelloWorldResponse() { String response = client.toBlocking() .retrieve(HttpRequest.GET("/hello")); assertEquals("Hello World", response); //) }}- 测试service
package hello.world;import io.micronaut.test.annotation.MicronautTest;import javax.inject.Inject;import org.junit.jupiter.api.Test;import static org.junit.jupiter.api.Assertions.assertEquals;@MicronautTestpublic class HelloClientSpec { @Inject HelloClient client; @Test public void testHelloWorldResponse(){ assertEquals("Hello World", client.hello().blockingGet()); }}打包应用
./gradlew assemble 效果
部署打包软件
java -jar build/libs/hello-world-0.1-all.jar 效果：
hello-world java -jar build/libs/hello-world-0.1-all.jar 16:20:24.013 [main] INFO io.micronaut.runtime.Micronaut - Startup completed in 2009ms. Server Running: http://localhost:8080docker 运行
默认micronaut 生成的项目包含了一个dockerfile ，我添加了一个docker-compose 文件
dockerfile
FROM adoptopenjdk/openjdk11-openj9:jdk-11.0.1.13-alpine-slimCOPY build/libs/hello-world-*-all.jar hello-world.jarEXPOSE 8080CMD java -Dcom.sun.management.jmxremote -noverify ${JAVA_OPTS} -jar hello-world.jarversion: "3"services: app: image: dalongrong/micronaut-hello-world build: ./ ports: - "8080:8080"运行&&效果
docker-compose up -d效果：
Creating network "hello-world_default" with the default driverBuilding appStep 1/4 : FROM adoptopenjdk/openjdk11-openj9:jdk-11.0.1.13-alpine-slimjdk-11.0.1.13-alpine-slim: Pulling from adoptopenjdk/openjdk11-openj94fe2ade4980c: Pull complete1ba2a07c78f2: Pull complete944724f145c9: Pull complete1cb512dae36f: Pull completeDigest: sha256:60718fa9eb6b6bc4ab6fe7f3a9db31b8725fb63ebdda833a43f541c07792ff5cStatus: Downloaded newer image for adoptopenjdk/openjdk11-openj9:jdk-11.0.1.13-alpine-slim ---> f3f4b8ddca6fStep 2/4 : COPY build/libs/hello-world-*-all.jar hello-world.jar ---> b794f9b8e0d4Step 3/4 : EXPOSE 8080 ---> Running in d3e19ae06642Removing intermediate container d3e19ae06642 ---> 2f4abdc6ddfdStep 4/4 : CMD java -Dcom.sun.management.jmxremote -noverify ${JAVA_OPTS} -jar hello-world.jar ---> Running in 5958c2868e24Removing intermediate container 5958c2868e24 ---> 44c4289cb2b6Successfully built 44c4289cb2b6Successfully tagged dalongrong/micronaut-hello-world:latestWARNING: Image for service app was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.Creating hello-world_app_1 ... done访问：
curl http://localhost:8080/hello Hello World% 
