方案
我有一个相当简单的Scalatra项目，包含Scala.js和LESS，我需要创建一个sbt构建配置。该项目分为三个部分：jvm，js，共享代码。
我当前的构建配置使用xsbt-web-plugin进行WAR打包，我想设置sbt-web，以便处理LESS源代码。
问题
使用当前配置，当我运行package命令时，sbt-web将资产放入 WEB-INF / classes / main / META-INF / resources / webjars / dataretrieverjvm / 0.1.0-SNAPSHOT 。我想将它们放在 WEB_INF / public 中，但我无法弄清楚如何实现这一目标。
这就是我的Build.scala目前的样子：
import org.scalajs.sbtplugin.cross.CrossProject
import sbt._
import com.earldouglas.xwp._
import play.twirl.sbt._
import org.scalajs.sbtplugin.ScalaJSPlugin
import org.scalajs.sbtplugin.ScalaJSPlugin.autoImport._
import com.typesafe.sbt.web._
import com.typesafe.sbt.web.SbtWeb.autoImport._
import com.typesafe.sbt.less.SbtLess.autoImport._
object DataRetrieverBuild extends Build {
private val organization = "Foobar Ltd"
private val scalaVersion = "2.11.7"
private val scalaBinaryVersion = "2.11"
private val scalatraVersion = "2.3.1"
private val akkaVersion = "latest.release"
private val scalacOptions = Seq(
"-unchecked", "-deprecation", "-Yinline-warnings", "-optimise", "-target:jvm-1.8", "-Xlint", "-feature"
)
private val javacOptions = Seq(
"-Xlint:all"
)
private val jvmLibraryDependencies = Def.setting(
Seq(
"ch.qos.logback" % "logback-classic" % "latest.release",
"com.mchange" % "c3p0" % "latest.release",
"com.typesafe.akka" %% "akka-actor" % akkaVersion,
"com.typesafe.play" %% "anorm" % "latest.release",
"javax.servlet" % "javax.servlet-api" % "3.1.0" % "provided",
"org.apache.commons" % "commons-email" % "latest.release",
"org.json4s" %% "json4s-jackson" % "latest.release",
"org.scalatra" %% "scalatra" % scalatraVersion,
"org.scalatra" %% "scalatra-auth" % scalatraVersion,
"org.slf4j" % "slf4j-api" % "latest.release",
"com.ibm.tools.target" % "was-liberty" % "8.5.x.3" % "provided"
)
)
private val jsLibraryDependencies = Def.setting(
Seq(
"be.doeraene" %%% "scalajs-jquery" % "latest.release",
"org.scala-js" %%% "scalajs-dom" % "latest.release",
"org.webjars" % "bootstrap" % "3.3.5" exclude("org.webjars", "jquery")
)
)
private val jsWebjarDependencies = Def.setting(
Seq(
"org.webjars" % "jquery" % "2.1.4" / "jquery.js" minified "jquery.min.js",
"org.webjars" % "underscorejs" % "1.8.3" / "underscore.js" minified "underscore-min.js",
"org.webjars" % "bootstrap" % "3.3.5" / "bootstrap.js" minified "bootstrap.min.js" dependsOn("jquery.js", "underscore.js", "moment.js"),
"org.webjars" % "ractive" % "0.7.1" / "ractive.js" minified "ractive.min.js",
"org.webjars" % "momentjs" % "2.10.6" / "moment.js" minified "moment.min.js"
)
)
private[this] val artifactPath = file(".")
private val autoAPIMappings = true
private val scalaDocOptions = Seq(
"-implicits", "-diagrams"
)
private lazy val sharedBuildSettings = Seq(
Keys.organization := organization,
Keys.name := "DataRetrieverShared",
Keys.version := "0.1.0-SNAPSHOT",
Keys.scalaVersion := scalaVersion,
Keys.scalaBinaryVersion := scalaBinaryVersion,
Keys.scalacOptions ++= scalacOptions,
Keys.scalacOptions in (Compile, Keys.doc) ++= scalaDocOptions ++ Opts.doc.title("DataRetrieverShared"),
Keys.javacOptions ++= javacOptions,
Keys.target in (Compile, Keys.doc) := file("jvm-api"),
Keys.autoAPIMappings := autoAPIMappings
)
private lazy val jvmBuildSettings = Seq(
Keys.organization := organization,
Keys.name := "DataRetrieverJVM",
Keys.version := "0.1.0-SNAPSHOT",
Keys.scalaVersion := scalaVersion,
Keys.scalaBinaryVersion := scalaBinaryVersion,
Keys.scalacOptions ++= scalacOptions,
Keys.scalacOptions in (Compile, Keys.doc) ++= scalaDocOptions ++ Opts.doc.title("DataRetrieverJVM"),
Keys.javacOptions ++= javacOptions,
Keys.checksums in Keys.update := Nil,
Keys.resolvers ++= Seq(
"IBM" at "http://public.dhe.ibm.com/ibmdl/export/pub/software/websphere/wasdev/maven/repository/"
),
Keys.libraryDependencies ++= jvmLibraryDependencies.value,
Keys.artifactPath in Keys.`package` ~= { defaultPath => artifactPath / defaultPath.getName },
Keys.artifactName in Keys.`package` := {
(sv: ScalaVersion, module: ModuleID, artifact: Artifact) =>
s"${artifact.name}.${artifact.extension}"
},
WebappPlugin.autoImport.webappWebInfClasses := true,
LessKeys.compress in Assets := true,
WebKeys.webTarget := Keys.target.value / "webapp" / "WEB-INF",
Keys.target in (Compile, Keys.doc) := file("jvm-api"),
Keys.autoAPIMappings := autoAPIMappings
)
private lazy val jsBuildSettings = Seq(
Keys.organization := organization,
Keys.name := "DataRetrieverJS",
Keys.version := "0.1.0-SNAPSHOT",
Keys.scalaVersion := scalaVersion,
Keys.scalaBinaryVersion := scalaBinaryVersion,
Keys.scalacOptions ++= scalacOptions,
Keys.scalacOptions in (Compile, Keys.doc) ++= scalaDocOptions ++ Opts.doc.title("DataRetrieverJS"),
Keys.libraryDependencies ++= jsLibraryDependencies.value,
jsDependencies ++= jsWebjarDependencies.value,
Keys.skip in packageJSDependencies := false,
Keys.target in (Compile, Keys.doc) := file("js-api"),
Keys.autoAPIMappings := autoAPIMappings
) ++ (
Seq(packageJSDependencies, fastOptJS, fullOptJS) map { packageJSKey =>
Keys.crossTarget in(Compile, packageJSKey) := Keys.baseDirectory.value / ".." / "jvm" / "src" / "main" / "webapp" / "WEB-INF" / "js"
}
)
lazy val root = Project(
id = "data-retriever-root",
base = file(".")
).aggregate(dataRetrieverJVM, dataRetrieverJS)
lazy val dataRetriever = CrossProject(
id = "data-retriever",
base = file("."),
crossType = CrossType.Full
).settings(
Defaults.coreDefaultSettings ++ sharedBuildSettings:_*
).jvmSettings(
Defaults.coreDefaultSettings ++ jvmBuildSettings:_*
).jsSettings(
Defaults.coreDefaultSettings ++ jsBuildSettings:_*
)
lazy val dataRetrieverJS = dataRetriever.js.enablePlugins(ScalaJSPlugin)
lazy val dataRetrieverJVM = dataRetriever.jvm.enablePlugins(WarPlugin, SbtTwirl, SbtWeb)
}
部分解决方案
WebKeys.exportedAssets in Assets := SbtWeb.syncMappings(Keys.streams.value.cacheDirectory, (WebKeys.exportedMappings in Assets).value, Keys.target.value / "webapp" / "WEB-INF" / "public"),
WebKeys.exportedMappings in Assets := (WebKeys.exportedMappings in Assets).value.map(item => item._1 -> item._2.replaceAll("""(.*(/|\\))*(.*)""", "$3"))
这种方式将资产复制到 WEB-INF / public 这很好，但遗憾的是sbt-web仍然将它们复制到 WEB-INF / classes 。
答案 0 :(得分：3)
看起来 META-INF / resources / webjars / dataretrieverjvm / 0.1.0-SNAPSHOT 路径可能来自sbt-web中的createWebJarMappings。
如果将其剥离，会发生什么？
{{1}}
答案 1 :(得分：0)
可以使用org.webjars.WebJarAssetLocator来帮助将部分路径解析为webjars中的完整路径。它是如何工作的：给定HTML页面中的链接，如<script src="/js/bootstrap.min.js"></script>，可以配置Servlet来解析类路径的路径。
Undertow的资源管理器示例：
public class WebLocatorWithClassPathFallbackResourceManager extends ClassPathResourceManager {
private WebJarAssetLocator webJarAssetLocator = new WebJarAssetLocator();
public WebLocatorWithClassPathFallbackResourceManager(ClassLoader classLoader) {
super(classLoader);
}
@Override
public Resource getResource(String resourcePath) throws IOException {
try {
return super.getResource(webJarAssetLocator.getFullPath(resourcePath));
} catch (MultipleMatchesException|IllegalArgumentException e) {
// handle mismatch
}
return super.getResource(resourcePath);
}
}
然后可以放置一个servlet来处理"/*"映射，并只从该类路径中提供资源。假设您的资源位于/META-INF/resources - 可用于Servlet 3.0 +。