JavaFX：访问资源文件夹中的文本文件时出现问题：不是FXML文件

时间：2018-12-15 18:27:22

标签： java file javafx netbeans resources

我在访问JavaFX项目内资源文件夹中存储的文本文件时遇到问题。我已经搜索过信息/解决方案，但是我一直在获取与使用FxmlLoader类访问fxml文件有关的问题的结果-这不是我的问题。

JavaFX项目结构 

JavaFxResourceLoadingTest
    |____ Source Packages
    |    |____ io.github.rkinson
    |         |____ FileLoader.java
    |         |____ ResourceLoadingTest.java
    |         |____ StandardApplication.java
    |____ Resources
         |____ files
              |____ testFile.txt

StandardApplication.java 是一个简单的标准Java程序，可在JavaFX项目结构中运行。该程序具有与“健全性检查”版本相同的代码（请参见下文），但是该程序失败，并显示以下输出。

ant -f C:\\Users\\admin\\Documents\\Code\\JavaFxResourceLoadingTest jfxsa-run
init:
Deleting: C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813
jfx-project-run:
Executing C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar using platform C:\Program Files\Java\jdk1.8.0_191\jre/bin/java
File 1: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 2: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 3: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 4: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar!\files\testFile.txt
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.nio.file.InvalidPathException: Illegal char <:> at index 4: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813\JavaFxResourceLoadingTest.jar!\files\testFile.txt
    at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
    at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
    at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
    at java.io.File.toPath(File.java:2234)
    at io.github.rkinson.ResourceLoadingTest.start(ResourceLoadingTest.java:46)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
... 1 more
Exception running application io.github.rkinson.ResourceLoadingTest
Java Result: 1
Deleting directory C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run179079813
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)

我知道这是例外；

  

原因：java.nio.file.InvalidPathException：索引4处的非法字符<：>：file：\ C：\ Users \ admin \ Documents \ Code \ JavaFxResourceLoadingTest \ dist \ run179079813 \ JavaFxResourceLoadingTest.jar！\ files \ testFile.txt

是由于文件路径无效引起的。

  

问题＃1 -为什么在JavaFX项目中运行 StandardApplication.java 时会使用此文件路径；

  

file：\ C：\ Users \ admin \ Documents \ Code \ JavaFxResourceLoadingTest \ dist \ run179079813 \ JavaFxResourceLoadingTest.jar！\ files \ testFile.txt

此文件路径时；

  

文件：C：\ Users \ admin \ Documents \ Code \ StandardResourceLoadingTest \ build \ classes \ files \ testFile.txt

当 StandardApplication.java （请参见下文）在其自己的Netbeans项目中作为单独的标准Java应用程序运行时，使用

吗？

ResourceLoadingTest.java 是一个简单的JavaFX应用程序，尝试使用两种略有不同的方法从资源文件夹中加载文件

  • 直接从start（）方法内部。
  • 来自单独的类 FileLoader.java ，因为这是我希望实际程序使用的方法。

ResourceLoadingTest.java 

    @Override
    public void start(Stage primaryStage) {
        Label fileContent = new Label("File load pending...");
        StackPane root = new StackPane();
        root.getChildren().add(fileContent);
        Scene scene = new Scene(root, 300, 250);
        primaryStage.setTitle("Resource Loading Test");
        primaryStage.setScene(scene);
        primaryStage.show();

        File file1 = new File(getClass().getResource("/files/testFile.txt").getFile());
        File file2 = new File(ResourceLoadingTest.class.getResource("/files/testFile.txt").getFile());
        System.out.println("File 1: " + file1.toString());
        System.out.println("File 2: " + file2.toString());

        FileLoader fileLoader = new FileLoader();
        File file3 = fileLoader.loadFileInstance("/files/testFile.txt");
        File file4 = FileLoader.loadFileStatic("/files/testFile.txt");
        System.out.println("File 3: " + file3.toString());
        System.out.println("File 4: " + file4.toString());

        File[] files = {file1, file2, file3, file4};
        for (File file : files) {
            try (BufferedReader reader = Files.newBufferedReader(file.toPath())) {
                String line = null;
                while ((line = reader.readLine()) != null) {
                    System.out.println("Content of file: '" + line + "'");
                }
            } catch (IOException ex) {
                System.err.format("IOException: %s%n", ex);
            }
        }

    }

FileLoader.java 

public File loadFileInstance(String path) {
    File file = new File(getClass().getResource(path).getFile());
    return file;
}

public static File loadFileStatic(String path) {
    File file = new File(FileLoader.class.getResource(path).getFile());
    return file;
}

当我运行 ResourceLoadingTest.java 时，将产生以下输出。

ant -f C:\\Users\\admin\\Documents\\Code\\JavaFxResourceLoadingTest jfxsa-run
init:
Deleting: C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\build\built-jar.properties
deps-jar:
Updating property file: C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\build\built-jar.properties
compile:
Detected JavaFX Ant API version 1.3
jfx-deployment:
jar:
Copying 12 files to C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269
jfx-project-run:
Executing C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar using platform C:\Program Files\Java\jdk1.8.0_191\jre/bin/java
File 1: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 2: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 3: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar!\files\testFile.txt
File 4: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar!\files\testFile.txt
Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.nio.file.InvalidPathException: Illegal char <:> at index 4: file:\C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269\JavaFxResourceLoadingTest.jar!\files\testFile.txt
    at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
    at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
    at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
    at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
    at java.io.File.toPath(File.java:2234)
    at io.github.rkinson.ResourceLoadingTest.start(ResourceLoadingTest.java:46)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
... 1 more
Exception running application io.github.rkinson.ResourceLoadingTest
Java Result: 1
Deleting directory C:\Users\admin\Documents\Code\JavaFxResourceLoadingTest\dist\run174399269
jfxsa-run:
BUILD SUCCESSFUL (total time: 2 seconds)

我知道由于意外的文件路径而引发了相同的异常；

  

file：\ C：\ Users \ admin \ Documents \ Code \ JavaFxResourceLoadingTest \ dist \ run174399269 \ JavaFxResourceLoadingTest.jar！\ files \ testFile.txt

问题＃2 为什么这个JavaFX项目试图使用此“意外”文件路径？

问题＃3 ：如何获取此JavaFX项目以访问存储在其中的文件

ResourceLoadingTest
    |____ Resources
        |____ files
            |____ testFile.txt

作为一个健全性检查，我可以想到最简单的文件访问项目，如下所示。这可以按预期工作：找到，加载，读取文件，并且文件内容显示在输出窗口中。

标准项目结构 

StandardResourceLoadingTest
    |____ Source Packages
    |    |____ io.github.rkinson
    |         |____ StandardResourceLoadingTest.java
    |____ Resources
        |____ files
            |____ testFile.txt

单个类 StandardResourceLoadingTest.java 仅包含以下主要方法。

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    File file = new File(StandardResourceLoadingTest.class.getResource("/files/testFile.txt").getFile());
    System.out.println("File: " + file.toString());
    try (BufferedReader reader = Files.newBufferedReader(file.toPath())) {
        String line = null;
        while ((line = reader.readLine()) != null) {
            System.out.println("Content of file: '" + line + "'");
        }
    } catch (IOException ex) {
        System.err.format("IOException: %s%n", ex);
    }
}

在 Netbeans 中运行时，将产生以下输出。

  

文件：C：\ Users \ admin \ Documents \ Code \ StandardResourceLoadingTest \ build \ classes \ files \ testFile.txt   文件内容：“文件加载成功。”

  

与StackEdit一起写。

0 个答案:

没有答案
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