运行时如何在Jar文件中修改文本文件？ [英] How can I modify a text file inside a Jar file while runtime?

问题描述

好吧，正如问题所说，那怎么可能？
此文件是我的proyect结构（我正在使用eclipse）。

Well as the question says, How is that possible? This file is my proyect structure (I'm using eclipse).

当导出为Jar时，我可以使用以下代码通过控制台访问和打印 root.ini内容，但是，如何在运行时写入该文件？

When exported as Jar, I can access and print the "root.ini" content through console with the code below but, How can I write to that file while runtime?

此方法从'Main.java'中调用

private void readRoot(){
    InputStream is = getClass().getResourceAsStream("/img/root.ini");
    BufferedReader br = null;

    br = new BufferedReader(new InputStreamReader(is));
    String path = "";

    try {
        path = br.readLine();
    } catch (IOException e) {
        e.printStackTrace();
    }
    System.out.println(path);
}

我实际上想做的是从JTextField获取一些文本，并将其保存到 root.ini文件中。

What I'm actually trying to do is get some text from a JTextField, and save it to "root.ini" file.

因此，当我尝试像这样写该文件时

So when I try to write to that file like this

private void writeRoot() {
    URL u = getClass().getResource("/img/root.ini");
    File f = null;
    try {
        f = new File(u.toURI());
        FileWriter fw = new FileWriter(f.getAbsolutePath());
        BufferedWriter bw = new BufferedWriter(fw);

        bw.write("Sample text"); //This String is obtained from a TextField.getText();

        bw.close();
        fw.close();
    } catch (URISyntaxException | IOException e) {
        e.printStackTrace();
    }
}

并抛出此错误

C：\Users\Francisco\Desktop\tds> java -jar TDS.jar
线程 AWT-EventQueue-0中的异常 java.lang.IllegalArgumentException：URI不是java.io.File处的分层
。（未知源）main处的$ b $b。Configuracion.writeRoot（Configuracion.java:99）主要处的
。 Configuracion.access $ 1（Configuracion.java:95）

C:\Users\Francisco\Desktop\tds>java -jar TDS.jar Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: URI is not hierarchical at java.io.File.(Unknown Source) at main.Configuracion.writeRoot(Configuracion.java:99) at main.Configuracion.access$1(Configuracion.java:95)

推荐答案

您不能更改任何jvm当前使用的jar的内容。该文件被操作系统锁定，因此无法更改。

You can't change any content of a jar which is currently used by a jvm. This file is considered locked by the operating system and therefore can't be changed.

我建议将此文件写入jar文件之外。例如相对于当前工作目录的 / conf 目录中。

I suggest to write this file outside your jar file. e.g. in a /conf directory relative to the current working dir.

这篇关于运行时如何在Jar文件中修改文本文件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！