ScalaTra(一)简单搭建以及jetty部署

• scala 2.12.4
• sbt 0.14.6
• scalatra 2.6.2
• 开发工具 vim

参考自：
http://scalatra.org/getting-started/first-project.html
http://scalatra.org/guides/2.4/deployment/standalone.html

• ./build.sbt

val ScalatraVersion = "2.6.2"

organization := "com.example"

name := "My Scalatra Web App"

version := "0.1.0-SNAPSHOT"

scalaVersion := "2.12.4"

resolvers += Classpaths.typesafeReleases

libraryDependencies ++= Seq(
  "org.scalatra" %% "scalatra" % ScalatraVersion,
  "org.scalatra" %% "scalatra-scalatest" % ScalatraVersion % "test",
  "ch.qos.logback" % "logback-classic" % "1.1.5" % "runtime",
  "javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",                                                                              
  "org.eclipse.jetty" % "jetty-webapp" % "9.2.15.v20160210" % "container;compile"
)
enablePlugins(SbtTwirl)
enablePlugins(ScalatraPlugin)

• ./project/plugins.sbt

addSbtPlugin("com.typesafe.sbt" % "sbt-twirl" % "1.3.12")
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.6")//sbt的assembly打包插件支持
addSbtPlugin("org.scalatra.sbt" % "sbt-scalatra" % "1.0.1") 

• 创建jetty启动器

  1 package com.example.app    
  2                            
  3 import org.eclipse.jetty.server.Server 
  4 import org.eclipse.jetty.servlet.{DefaultServlet, ServletContextHandler}
  5 import org.eclipse.jetty.webapp.WebAppContext
  6 import org.scalatra.servlet.ScalatraListener
  7 
  8 object JettyLauncher { // this is my entry object as specified in sbt project definition                                                 
  9   def main(args: Array[String]) { 
 10     val port = if(System.getenv("PORT") != null) System.getenv("PORT").toInt else 8080
 11 
 12     val server = new Server(port)   
 13     val context = new WebAppContext()
 14     context setContextPath "/"
 15     context.setResourceBase("src/main/webapp")
 16     context.addEventListener(new ScalatraListener)
 17     context.addServlet(classOf[MyScalatraServlet], "/*")
 18     context.addServlet(classOf[LoginServlet], "/login")
 19     server.setHandler(context)
 20       
 21     server.start
 22     server.join            
 23   }
 24 }

• LoginServlet.scala

  1 package com.example.app    
  2                            
  3 import org.scalatra._      
  4 
  5 class LoginServlet extends ScalatraServlet {
  6 
  7   get("/") {               
  8     println("Test")        
  9     "Hi LoginServlet:GET!\n"                                                                                                             
 10   } 
 11       
 12 }

• MyScalatraServlet.scala

  1 package com.example.app    
  2                                                                                                                                          
  3 import org.scalatra._
  4 import java.util.concurrent.TimeUnit
  5 
  6 class MyScalatraServlet extends ScalatraServlet {
  7 
  8   get("/") {
  9     TimeUnit.SECONDS.sleep(3)
 10     "Hi MyScalatraServlet:GET!\n"
 11   }
 12 
 13 }

ScalatraBootstrap.scala

import com.example.app._
import org.scalatra._
import javax.servlet.ServletContext
import com.example.app.MyScalatraServlet
import com.example.app.LoginServlet

class ScalatraBootstrap extends LifeCycle {
  override def init(context: ServletContext) {
    context.mount(new MyScalatraServlet, "/*")
    context.mount(new LoginServlet, "/login")
  }
}

• 运行

[root@xxy-srv-test-01 my-scalatra-web-app]# sbt
[info] Loading settings from plugins.sbt ...
[info] Loading project definition from /data1/taohui/hi_scala/my-scalatra-web-app/project
[info] Loading settings from build.sbt ...
[info] Set current project to My Scalatra Web App (in build file:/data1/taohui/hi_scala/my-scalatra-web-app/)
[info] sbt server started at 127.0.0.1:5741
sbt:My Scalatra Web App> 
sbt:My Scalatra Web App> jetty:start
[info] Updating {file:/data1/taohui/hi_scala/my-scalatra-web-app/}my-scalatra-web-app...
[info] Done updating.
[info] starting server ...
2017-12-26 15:54:39.445:INFO::main: Logging initialized @185ms to org.eclipse.jetty.util.log.StdErrLog
[success] Total time: 3 s, completed Dec 26, 2017 3:54:39 PM
2017-12-26 15:54:39.456:INFO:oejr.Runner:main: Runner
sbt:My Scalatra Web App> 2017-12-26 15:54:39.679:INFO:oejs.Server:main: jetty-9.4.6.v20170531
2017-12-26 15:54:41.777:INFO:oeja.AnnotationConfiguration:main: Scanning elapsed time=1806ms
2017-12-26 15:54:42.174:INFO:oejs.session:main: DefaultSessionIdManager workerName=node0
2017-12-26 15:54:42.174:INFO:oejs.session:main: No SessionScavenger set, using defaults
2017-12-26 15:54:42.178:INFO:oejs.session:main: Scavenging every 600000ms
15:54:42.247 [main] INFO  o.scalatra.servlet.ScalatraListener - The cycle class name from the config: ScalatraBootstrap
15:54:42.600 [main] INFO  o.scalatra.servlet.ScalatraListener - Initializing life cycle class: ScalatraBootstrap
2017-12-26 15:54:42.804:INFO:oejsh.ContextHandler:main: Started o.e.j.w.WebAppContext@5d3411d{/,file:///data1/taohui/hi_scala/my-scalatra-web-app/target/webapp/,AVAILABLE}{file:///data1/taohui/hi_scala/my-scalatra-web-app/target/webapp/}
2017-12-26 15:54:42.824:INFO:oejs.AbstractConnector:main: Started ServerConnector@306cf3ea{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
2017-12-26 15:54:42.825:INFO:oejs.Server:main: Started @3568ms
jetty:start

• jetty容器独立部署 [sbt-shell窗口下]
  使用sbt的assembly进行项目打包

[info] SHA-1: b2ce657adc3335fe018621166ef763419031cb9c
[info] Packaging /data1/taohui/hi_scala/my-scalatra-web-app/target/scala-2.12/My Scalatra Web App-assembly-0.1.0-SNAPSHOT.jar ...
[info] Done packaging.
[success] Total time: 9 s, completed Dec 26, 2017 3:55:24 PM
sbt:My Scalatra Web App> 

• 备注
  jetty容器上运行，需要添加对应的jetty依赖和sbt的assembly插件支持，配置明细见上，输出jar包后直接java -jar <jar_name>.jar，即可运行。