如何从包中读取文件 - 类似于Java中的资源包

问题描述

我有一个word.txt文件，我已经放在一个特定的java包，并需要从同一个位置读取它。我不控制部署，所以我不知道软件包将在哪里部署。

示例位置：com / example / files / words.txt。 p>

我知道如何使用ResourceBundle类从包层次结构中读取属性文件，而不是相对/绝对路径。像 ResourceBundle.getBundle（com.example.files.words）有一些类似的常规文件，以便我可以从包层次结构读取它，而不是一些绝对/相对路径？

解决方案

可以使用 getResourceAsStream（）方法（在类中定义 Class ）从类路径中检索资源。如果class WordReader 位于包 com.example 中，则资源文件的路径应为 files / words.txt

  package com.example; 
 
 public class WordReader {
 
 public void readWords（）{
 InputStream is = getClass（）。getResourceAsStream（files / words.txt）; 
 StringBuilder sb = new StringBuilder（）; 
 for（Scanner sc = new Scanner（is）; sc.hasNext（）;）
 sb.append（sc.nextLine（））。append（'\\\
'）; 
 
 String content = sb.toString（）; 
} 
} 
  

I have a words.txt file that I have put in a particular java package and would need to read it from that same location. I do not control the deployment, so I don't know where the packages will be deployed.

Example location: com/example/files/words.txt .

I know how to use the ResourceBundle class to read properties file from the package hierarchy rather than a relative/absolute path. like ResourceBundle.getBundle(com.example.files.words) Is there something similar for general files so that I can read it from the package hierarchy rather than some absolute/relative path?

解决方案

You can use the getResourceAsStream() method (defined at class Class) to retrieve resources from the class-path. If class WordReader is located in package com.example then the path to the resource file should be files/words.txt

package com.example;

public class WordReader {

   public void readWords() {
     InputStream is = getClass().getResourceAsStream("files/words.txt");
     StringBuilder sb = new StringBuilder();
     for(Scanner sc = new Scanner(is); sc.hasNext(); )
         sb.append(sc.nextLine()).append('\n');

     String content = sb.toString();
   }
}

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