Jar无法访问txt文件 [英] Jar can't access txt files

问题描述

我是Java的新手，我遇到了一个无法找到解决方案的问题。
我编写了一个读取和写入txt文件的程序。当我在NetBeans中运行它似乎工作正常，但是当我尝试运行JAR文件时，似乎程序无法访问txt文件。

<我使用以下代码创建了该文件：

 文件数据=新文件（src / data.txt）; 
  

可能之所以无法创建文件？如果不是它可能是什么？

编辑：
文本文件正在被修改为程序前进，如果我使用输入流我将无法要写入或更改txt文件，我应该更改我管理数据的方式吗？ （txt文件）或jar有没有办法访问Txt文件？

解决方案

方法1：在创建jar并运行程序的地方，jar目录下没有名为src的文件夹。您应该在jar位置的同一目录中创建一个名为src的文件夹。这将允许文件写入操作。

方法2：如果你想将txt文件保存在jar中，那么你可以使用：

  InputStream in = this.getClass（）。getClassLoader（）
 .getResourceAsStream（your package path / data.txt ）; 
  

一个完整的例子：

  package com.file.loader; 
 
公共类Main {
 public static void main（String [] args）抛出IOException {
 InputStream in = Main.class.getClassLoader（）。getResourceAsStream（
 COM /文件/装载器/ data.txt中）; 
} 
} 
  

I'm pretty new to Java and I'm facing a problem that I can't find a solution for. I have written a program that reads and writes to a txt file. When I run it in NetBeans it seems to be working fine, but when I try to run the JAR file, it seems as if the program can't access the txt file.

I created the file using the following code :

File data = new File("src/data.txt");

Could the reason why it won't work be in the creation of the file? And if not what could it be?

EDIT: The text file is being modified as program advances, if I use the inputstream I won't be able to write to or change the txt file, should I change the way on which I'm managing my data? ( txt files) or is there a way for the jar to still have access to the Txt file?

解决方案

Method 1: Where you are creating jar and running the program there is no such folder called "src" under the jar directory. You should create a folder called "src" in same directory of jar location. This will allow file write operation.

Method 2: If you want to keep the txt file inside the jar then you can use:

InputStream in = this.getClass().getClassLoader()
                            .getResourceAsStream("your package path/data.txt");

A complete example:

package com.file.loader;

public class Main {
    public static void main(String[] args) throws IOException {
    InputStream in = Main.class.getClassLoader().getResourceAsStream(
            "com/file/loader/data.txt");
    }
}

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