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akka开发（一）HelloWorld
package com.hfi.helloakka;import akka.actor.ActorRef;import akka.actor.Props;import akka.actor.UntypedActor;public class HelloWorld extends UntypedActor { @Override public void preStart() { // create the greeter actor final ActorRef greeter = getContext().actorOf(Props.create(Greeter.class), "greeter"); // tell it to perform the greeting greeter.tell(Greeter.Msg.GREET, getSelf()); } @Override public void onReceive(Object msg) { if (msg == Greeter.Msg.DONE) { // when the greeter is done, stop this actor and with it the application getContext().stop(getSelf()); } else unhandled(msg); } }
package com.hfi.helloakka;import akka.actor.UntypedActor;public class Greeter extends UntypedActor { public static enum Msg { GREET, DONE; } @Override public void onReceive(Object msg) { if (msg == Msg.GREET) { System.out.println("Hello World!"); getSender().tell(Msg.DONE, getSelf()); } else unhandled(msg); } }
pom.xml
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.hfi</groupId> <artifactId>helloakka</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>helloakka Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>org.scala-lang</groupId> <artifactId>scala-library</artifactId> <version>2.10.2</version> </dependency> <dependency> <groupId>com.typesafe.akka</groupId> <artifactId>akka-actor_2.10</artifactId> <version>2.2.5</version> </dependency> </dependencies> <build> <finalName>helloakka</finalName> </build></project>
可能遇到的问题：
java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class
用的akka包跟依赖的scala包版本不一致导致（貌似scala不向下兼容它的旧版本），笔者一开始用的2.11.7报错，换成pom中的2.10.2后（到akka-2.2.5.zip中看的版本号）程序就跑起来了。 参考了：http://www.jianshu.com/p/59733597d448
akka开发（一）HelloWorld
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