Java无法识别JAR中的文件 [英] Java won't recognize file in JAR

问题描述

我的Java程序的JAR文件中有一个.csv数据库文件.在打包之前，该程序可以在NetBeans IDE中正常运行，但是一旦这样做，它就不会相信文件在其中，即使我已将其打印出查找的路径并解压缩JAR以确保我告诉了它.找对地方.我如何让Java看到这一点?

I have a .csv database file inside my java program's JAR file. The program works fine in NetBeans IDE before I package it, but once I do, it refuses to believe the file is in it, even though I had it print out the path where it was looking and unzipped the JAR to be sure I told it to look in the right place. How do I make Java see this?

  try
  {
    String path = Main.class.getResource("/items.csv").getPath();
    db = new java.io.File(path);
    loadValues(db);
  }
  catch (java.io.FileNotFoundException ex1)
  {
    System.out.println("Could not find database file (" + ui.db + ").");
  }

推荐答案

不要为资源创建File对象，因为可能没有File. File表示文件系统上仅 个真实"文件.就操作系统而言，.jar文件中的文件"只是一些字节.

Don't create a File object for the resource, as there may be no File. A File represents only "real" files on the filesystem. As far as the OS is concerned a "file" inside a .jar file is just some bytes.

您需要使用 getResourceAsStream() 来获取InputStream并从中读取.

You'll need to use getResourceAsStream() to get an InputStream and read from that.

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