第 3 章 开发和部署 Eclipse Vert.x 运行时应用程序

流程

1. 创建新目录 myApp，并导航到它。

   $ mkdir myApp
   $ cd myApp

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   这是应用的根目录。

2. 在根目录中创建目录结构 src/main/java/com/example/，然后导航到.

   $ mkdir -p src/main/java/com/example/
   $ cd src/main/java/com/example/

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3. 创建包含应用代码的 Java 类文件 MyApp.java。

   package com.example;
   
   import io.vertx.core.AbstractVerticle;
   import io.vertx.core.Promise;
   
   public class MyApp extends AbstractVerticle {
   
       @Override
       public void start(Promise<Void> promise) {
           vertx
               .createHttpServer()
               .requestHandler(r ->
                   r.response().end("Greetings!"))
               .listen(8080, result -> {
                   if (result.succeeded()) {
                       promise.complete();
                   } else {
                       promise.fail(result.cause());
                   }
               });
       }
   }

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4. 在应用程序根目录 myApp 中创建 pom.xml 文件，其内容如下：

   <?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.example</groupId>
     <artifactId>my-app</artifactId>
     <version>1.0.0-SNAPSHOT</version>
     <packaging>jar</packaging>
   
     <name>My Application</name>
     <description>Example application using Vert.x</description>
   
     <properties>
       <vertx.version>4.3.7.redhat-00002</vertx.version>
       <vertx-maven-plugin.version>1.0.24</vertx-maven-plugin.version>
       <vertx.verticle>com.example.MyApp</vertx.verticle>
   
       <!-- Specify the JDK builder image used to build your application. -->
       <jkube.generator.from>registry.access.redhat.com/ubi8/openjdk-11</jkube.generator.from>
   
       <maven.compiler.source>1.8</maven.compiler.source>
       <maven.compiler.target>1.8</maven.compiler.target>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     </properties>
   
     <!-- Import dependencies from the Vert.x BOM. -->
     <dependencyManagement>
       <dependencies>
         <dependency>
           <groupId>io.vertx</groupId>
           <artifactId>vertx-dependencies</artifactId>
           <version>${vertx.version}</version>
           <type>pom</type>
           <scope>import</scope>
         </dependency>
       </dependencies>
     </dependencyManagement>
   
     <!-- Specify the Vert.x artifacts that your application depends on. -->
     <dependencies>
       <dependency>
         <groupId>io.vertx</groupId>
         <artifactId>vertx-core</artifactId>
       </dependency>
       <dependency>
         <groupId>io.vertx</groupId>
         <artifactId>vertx-web</artifactId>
       </dependency>
     </dependencies>
   
     <!-- Specify the repositories containing Vert.x artifacts. -->
     <repositories>
       <repository>
         <id>redhat-ga</id>
         <name>Red Hat GA Repository</name>
         <url>https://maven.repository.redhat.com/ga/</url>
       </repository>
     </repositories>
   
     <!-- Specify the repositories containing the plugins used to execute the build of your application. -->
     <pluginRepositories>
       <pluginRepository>
         <id>redhat-ga</id>
         <name>Red Hat GA Repository</name>
         <url>https://maven.repository.redhat.com/ga/</url>
       </pluginRepository>
     </pluginRepositories>
   
     <!-- Configure your application to be packaged using the Vert.x Maven Plugin. -->
     <build>
       <plugins>
         <plugin>
           <groupId>io.reactiverse</groupId>
           <artifactId>vertx-maven-plugin</artifactId>
           <version>${vertx-maven-plugin.version}</version>
           <executions>
             <execution>
               <id>vmp</id>
               <goals>
                 <goal>initialize</goal>
                 <goal>package</goal>
               </goals>
             </execution>
           </executions>
         </plugin>
       </plugins>
     </build>
   </project>

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5. 从应用的根目录使用 Maven 构建应用。

   $ mvn vertx:run

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6. 验证应用是否正在运行。

   使用 curl 或您的浏览器，验证您的应用程序正在 http://localhost:8080 中运行。

   $ curl http://localhost:8080
   Greetings!

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