java文件在那里时找不到

Question

出于某种原因（Java新手），当我试图从我的资源文件夹中读取Excel文件时，它会显示它在那里，但当我使用FileInputStream读取它时，会出现FileNotFound异常。有什么想法吗

代码：

public static void openExcelSheet() throws IOException {
    FileInputStream fileInputStream = null;
    if(applicationSettings.class.getResourceAsStream("/files/Employees.xlsx") != null) {
        System.out.println("File Found");
        fileInputStream = new FileInputStream("/files/Employees.xlsx");
    }else {
        System.out.println("File Not Found");
    }

    XSSFWorkbook workbook = new XSSFWorkbook(fileInputStream);

    //int numberOfSheets = workbook.getNumberOfSheets();
    System.out.println(workbook.getAllNames());

    workbook.close();
}

以下是我收到的输出：

File Found Exception in Application start method java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473) at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941) Caused by: java.lang.RuntimeException: Exception in Application start method at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198) at java.base/java.lang.Thread.run(Thread.java:844) Caused by: java.io.FileNotFoundException: /files/Employees.xlsx (No such file or directory) at java.base/java.io.FileInputStream.open0(Native Method) at java.base/java.io.FileInputStream.open(FileInputStream.java:220) at java.base/java.io.FileInputStream.<init>(FileInputStream.java:158) at java.base/java.io.FileInputStream.<init>(FileInputStream.java:113) at applicationSettings.openExcelSheet(applicationSettings.java:32) at loginScreen.start(loginScreen.java:70) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418) at java.base/java.security.AccessController.doPrivileged(Native Method) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417) at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) Exception running application loginScreen