java無法使FileReader正常工作

Question

根目錄名爲CopyFile，有目錄文件和src。文件具有文本文件loremipsum.txt。 SRC具有COM /示例/ JAVA/Main.java

這是Main.java

package com.example.java; 

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.FileWriter; 

public class Main { 

    public static void main(String[] args) { 

     String sourceFile = "files/loremipsum.txt"; 
     String targetFile = "files/target.txt"; 

     try (FileReader fReader = new FileReader(sourceFile); 
      BufferedReader bReader = new BufferedReader(fReader); 
      FileWriter writer = new FileWriter(targetFile)){ 

      while (true){ 
       String line = bReader.readLine(); 
       if (line == null) { 
        break; 
       } else{ 
        writer.write(line + "\n"); 
       } 
      } 

      System.out.println("File Copied!"); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

下面的代碼是錯誤：

java.io.FileNotFoundException: files/loremipsum.txt (No such file or directory) 
at java.io.FileInputStream.open0(Native Method) 
at java.io.FileInputStream.open(FileInputStream.java:195) 
at java.io.FileInputStream.<init>(FileInputStream.java:138) 
at java.io.FileInputStream.<init>(FileInputStream.java:93) 
at java.io.FileReader.<init>(FileReader.java:58) 
at com.example.java.Main.main(Main.java:15) 
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:497) 
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 

過程，退出代碼完成0

Answer 1

如果您將以上變量定義爲您的文件位置：

File here = new File("."); 
System.out.println(here.getAbsolutePath()); 

您會看到Java正在尋找項目根目錄下的文件，並在src或out內的任何位置找到而不是。

所以，你的項目目錄樹應該是這樣的（假設的IntelliJ）：

ProjectName/ 
    .idea/ 
    files/ 
     loremipsum.txt 
     target.txt 
    out/ 
     production/ 
      ProjectName/ 
       package.name/ 
        Main.class 
    src/ 
     package.name/ 
       Main.java 
    ProjectName.iml