无法从资源中读取文件

Posted 2021-04-12

我有一个关于scala和sbt的项目。我尝试从资源中获取文件。

  val filename = getClass.getResource("/emptyClickReports.csv").getFile
  log.debug("get empty report {} from resource folder {} ", filePath, filename)
  val file = new File(filename)
  log.debug("file exists: {}", file.exists())
  log.debug("file getAbsolutePath: {}", file.getAbsolutePath())
  log.debug("file getCanonicalPath: {}", file.getCanonicalPath())
  log.debug("file getPath: {}", file.getPath())

  file

当我用sbt run启动项目时 - 没关系，文件存在

[DEBUG] - 2017-12-07 14:25:09,469 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - get empty report /emptyClickReports.csv from resource folder /home/slava/projects/ds-selenium/target/scala-2.11/classes/emptyClickReports.csv 
[DEBUG] - 2017-12-07 14:25:09,470 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file exists: true
[DEBUG] - 2017-12-07 14:25:09,470 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getAbsolutePath: /home/slava/projects/ds-selenium/target/scala-2.11/classes/emptyClickReports.csv
[DEBUG] - 2017-12-07 14:25:09,470 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getCanonicalPath: /home/slava/projects/ds-selenium/target/scala-2.11/classes/emptyClickReports.csv
[DEBUG] - 2017-12-07 14:25:09,470 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getPath: /home/slava/projects/ds-selenium/target/scala-2.11/classes/emptyClickReports.csv
[INFO ] - 2017-12-07 14:25:09,471 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.scenarios.controllers.ScenarioController - file downloaded /home/slava/projects/ds-selenium/target/scala-2.11/classes/emptyClickReports.csv, file length: 97

但是当我做sbt阶段，然后使用bin文件运行时我接下来：

[DEBUG] - 2017-12-07 14:58:50,085 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file exists: false
[DEBUG] - 2017-12-07 14:58:50,085 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getAbsolutePath: /home/slava/projects/ds-selenium/file:/home/slava/projects/ds-selenium/target/universal/stage/lib/ds-selenium.ds-selenium-0.1.5.jar!/emptyClickReports.csv
[DEBUG] - 2017-12-07 14:58:50,085 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getCanonicalPath: /home/slava/projects/ds-selenium/file:/home/slava/projects/ds-selenium/target/universal/stage/lib/ds-selenium.ds-selenium-0.1.5.jar!/emptyClickReports.csv
[DEBUG] - 2017-12-07 14:58:50,085 - ds-selenium - 9d0ca610-0291-4ae0-8fd9-18229ca0641e - c.dsources.selenium.common.services.FileManipulationsService - file getPath: file:/home/slava/projects/ds-selenium/target/universal/stage/lib/ds-selenium.ds-selenium-0.1.5.jar!/emptyClickReports.csv
[

文件不存在，路径是：

file:/home/slava/projects/ds-selenium/target/universal/stage/lib/ds-selenium.ds-selenium-0.1.5.jar!/emptyClickReports.csv

当我使用bin文件运行项目时，如何从资源获取文件？

答案

从文件中读取资源时，与从jar中读取资源时相比，需要使用不同的咒语。如你所知，stage任务构建了一个jar。很多人问过similar questions on StackOverflow。

我在这里重复这个答案，但是链接到Java 8运行时库，因为Scala目前支持它：

总结一下，你应该使用java.lang.Class.getResourceAsStream(String)，参见https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html#getResourceAsStream-java.lang.String-

This是这个问题的另一个好答案。