获取FileNotFoundException，即使文件存在且拼写正确[重复]

Question

public class GradeStats {
public static void main(String[] args){
    ListCreator lc = new ListCreator(); //create ListCreator object
    lc.getGrades(); //start the grade listing process
    try{
        File gradeList = new File("C:/Users/Casi/IdeaProjects/GradeStats/GradeList");
        FileReader fr = new FileReader(gradeList); 

        BufferedReader bf = new BufferedReader(fr);       

        String line;

        while ((line = bf.readLine()) != null){
            System.out.println(line);
        }
        bf.close();
    }catch(Exception ex){
        ex.printStackTrace();


    }
}

java.io.FileNotFoundException: GradeList.txt (The system cannot find the file specified)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileReader.<init>(FileReader.java:72)
    at ListCreator.getGrades(ListCreator.java:17)
    at GradeStats.main(GradeStats.java:11)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Answer 1

添加：

String curDir = System.getProperty("user.dir");

把这个打印出来。它将告诉您当前的工作目录是什么。然后您应该能够看到为什么它找不到文件。

如果找不到文件，您可以检查以允许自己执行某些操作，而不是允许您的代码抛出：

File GradeList = new File("GradeList.txt");
if(!GradeList.exists()) {
    System.out.println("Failed to find file");
   //do something
}

String curDir = System.getProperty("user.dir");
File GradeList = new File("GradeList.txt");
System.out.println("Current sys dir: " + curDir);
System.out.println("Current abs dir: " + GradeList.getAbsolutePath());