2015-03-06 15:10:39 +00:00
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### 50. Heroku
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Heroku是另外一个流行的Paas平台。想要自定义Heroku的构建过程，你可以提供一个`Procfile`，它提供部署一个应用所需的指令。Heroku为Java应用分配一个端口，确保能够路由到外部URI。
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你必须配置你的应用监听正确的端口。下面是用于我们的starter REST应用的Procfile：
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```shell
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web: java -Dserver.port=$PORT -jar target/demo-0.0.1-SNAPSHOT.jar
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```
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Spring Boot将`-D`参数作为属性，通过一个Spring的Environment实例访问。`server.port`配置属性适合于内嵌的Tomcat，Jetty或Undertow实例启用时使用。`$PORT`环境变量被分配给Heroku Paas使用。
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Heroku默认使用Java 1.6。只要你的Maven或Gradle构建时使用相同的版本就没问题（Maven用户可以设置`java.version`属性）。如果你想使用JDK 1.7，在你的pom.xml和Procfile临近处创建一个system.properties文件。在该文件中添加以下设置：
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```java
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java.runtime.version=1.7
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```
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这就是你需要做的一切。对于Heroku部署来说，经常做的工作就是使用`git push`将代码推送到生产环境。
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```shell
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$ git push heroku master
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Initializing repository, done.
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Counting objects: 95, done.
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Delta compression using up to 8 threads.
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Compressing objects: 100% (78/78), done.
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Writing objects: 100% (95/95), 8.66 MiB | 606.00 KiB/s, done.
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Total 95 (delta 31), reused 0 (delta 0)
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-----> Java app detected
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-----> Installing OpenJDK 1.7... done
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-----> Installing Maven 3.2.3... done
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-----> Installing settings.xml... done
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-----> executing /app/tmp/cache/.maven/bin/mvn -B
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-Duser.home=/tmp/build_0c35a5d2-a067-4abc-a232-14b1fb7a8229
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-Dmaven.repo.local=/app/tmp/cache/.m2/repository
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-s /app/tmp/cache/.m2/settings.xml -DskipTests=true clean install
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[INFO] Scanning for projects...
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Downloading: http://repo.spring.io/...
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Downloaded: http://repo.spring.io/... (818 B at 1.8 KB/sec)
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....
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Downloaded: http://s3pository.heroku.com/jvm/... (152 KB at 595.3 KB/sec)
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[INFO] Installing /tmp/build_0c35a5d2-a067-4abc-a232-14b1fb7a8229/target/...
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[INFO] Installing /tmp/build_0c35a5d2-a067-4abc-a232-14b1fb7a8229/pom.xml ...
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[INFO] ------------------------------------------------------------------------
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[INFO] BUILD SUCCESS
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[INFO] ------------------------------------------------------------------------
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[INFO] Total time: 59.358s
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[INFO] Finished at: Fri Mar 07 07:28:25 UTC 2014
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[INFO] Final Memory: 20M/493M
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[INFO] ------------------------------------------------------------------------
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-----> Discovering process types
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Procfile declares types -> web
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-----> Compressing... done, 70.4MB
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-----> Launching... done, v6
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http://agile-sierra-1405.herokuapp.com/ deployed to Heroku
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To git@heroku.com:agile-sierra-1405.git
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* [new branch] master -> master
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```
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现在你的应用已经启动并运行在Heroku。
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