如何讀取位於項目文件夾中的文件java

Question

使用eclipse，我的項目文件夾中標題爲bad_words.txt的文件名爲HackGSU。我想找到該文件並閱讀該文件的內容。我看到這個答案how to read text file relative path，我想這：

private static String words[][] = new String[3][]; 
private static int ok = 17 + 2; //Add two for comment & empty line in text file 
private static int med = 26 + 2; //Add two for comment & empty line in text file 
private static int bad = 430 + 1; //Add one for comment in text file 
private static String p = new File("").getAbsolutePath(); 

public static String[][] openFile() { 

    p.concat("/HackGSU/bad_words.txt"); 

    //Set the a limit for the amount of words in each row 
    words[0] = new String[getOk()]; 
    words[1] = new String[getMed()]; 
    words[2] = new String[getBad()]; 

    //Read the text file to add bad words to an array 
    try { 
     FileReader fr = new FileReader(p); 
     //Wrap file 
     BufferedReader br = new BufferedReader(fr); 

     //Add each line of file into the words array 
     for(int i = 0; i < words.length; i++) {    

      for(int j = 0; j < words[i].length; j++) { 
       try { 
        words[i][j] = br.readLine(); 
       } 
       catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     } 

    } 
    catch (FileNotFoundException e1) { 
     e1.printStackTrace(); 
    } 

    return words; 
} 

但我收到此回溯：

java.io.FileNotFoundException: C:\Users\nbrow_000\workspaceProjects\HackGSU (Access is denied) 
at java.io.FileInputStream.open0(Native Method) 
at java.io.FileInputStream.open(Unknown Source) 
at java.io.FileInputStream.<init>(Unknown Source) 
at java.io.FileInputStream.<init>(Unknown Source) 
at java.io.FileReader.<init>(Unknown Source) 
at gsu.hack.harassment.BadWords.openFile(BadWords.java:28) 
at gsu.hack.harassment.HarassFilter.<clinit>(HarassFilter.java:10) 
at gsu.hack.harassment.CheckPercentage.main(CheckPercentage.java:20) 

Exception in thread "main" java.lang.NullPointerException 
at gsu.hack.harassment.HarassFilter.checkHarass(HarassFilter.java:23) 
at gsu.hack.harassment.CheckPercentage.main(CheckPercentage.java:20) 

我也因此這個答案How to read a text file directly from Internet using Java?，但我曾與URL構造一個問題。

如果我把本地文件路徑（C：//.../bad_words.txt）它工作得很好，但我怎樣才能讓程序讀取文件，如果我打包軟件它仍然會找到適當的文件路徑。

Answer 1

望着誤差不看像你正在得到完整的路徑。取而代之的

p.concat("/HackGSU/bad_words.txt"); 

嘗試

p = p.concat("/HackGSU/bad_words.txt"); 

Answer 2

看看這個問題的答案，它可能是你在找什麼！

How to read file from relative path in Java project? java.io.File cannot find the path specified

Answer 3

你或許應該用反斜槓代替斜槓：

p.concat("\HackGSU\bad_words.txt"); 

您也可以嘗試鍵入雙反斜線：

p.concat("\\HackGSU\\bad_words.txt"); 

Answer 4

如果你的資源是已經在classpath中，你不需要使用相對路徑與File類。

java.net.URL url = getClass().getResource("bad_words.txt"); 
File file = new File(url.getPath()); 

甚至直接的InputStream：您可以輕鬆地像classpath中獲得它

InputStream in = getClass().getResourceAsStream("bad_words.txt"); 

既然你有一個static方法使用：

InputStream in = YourClass.class.getResourceAsStream("bad_words.txt"); 

此外，正如我提到它已經在我的評論中：

p.concat("/HackGSU/bad_words.txt"); 

不會連接到p，但會返回一個新的連接字符串，因爲字符串是不可變的。 簡單使用：p+="/HackGSU/bad_words.txt"改爲