如何輸出保存到一個txt文件

Question

快速Q

我有一個循環，發現在一個目錄下的所有文件，我想要做的就是添加一行代碼到它會寫這些結果成txt文件，如何將我最好做到這一點

當前代碼：

public String FilesInFolder() { 
     // Will list all files in the directory, want to create a feature on the page that can display this to the user 

     String path = NewDestination; 
     System.out.println("Starting searching files in directory"); // making sure it is called 
     String files; 
     File folder = new File(path); 
     File[] listOfFiles = folder.listFiles(); 

     for (int i = 0; i < listOfFiles.length; i++) { 

      if (listOfFiles[i].isFile()) { 
       files = listOfFiles[i].getName(); 
       System.out.println(files); 
      } 
     } 
     return ""; 
    } 

Answer 1

您可以一起使用FileWriter和StringWriter。

public String FilesInFolder() throws IOException { 
    FileWriter fw = new FileWriter("file.txt"); 
    StringWriter sw = new StringWriter(); 

    // Will list all files in the directory, want to create a feature on the page that can display this to the user 

    String path = NewDestination; 
    System.out.println("Starting searching files in directory"); // making sure it is called 
    String files; 
    File folder = new File(path); 
    File[] listOfFiles = folder.listFiles(); 

    for (int i = 0; i < listOfFiles.length; i++) { 

     if (listOfFiles[i].isFile()) { 
      files = listOfFiles[i].getName(); 
      sw.write(files); 
      System.out.println(files); 
     } 
    } 
    fw.write(sw.toString()); 
    fw.close(); 
    return ""; 
} 

Answer 2

隨着FileWritter和BufferedWriter：

public String FilesInFolder() { 
    // Will list all files in the directory, want to create a feature on the page that can display this to the user 

    String path = NewDestination; 
    System.out.println("Starting searching files in directory"); // making sure it is called 
    String files; 
    File folder = new File(path); 
    File[] listOfFiles = folder.listFiles(); 


    File file = new File("output.txt"); 

    // if file doesnt exists, then create it 
    if (!file.exists()) { 
     file.createNewFile(); 
    } 
    FileWriter fw = new FileWriter(file.getAbsoluteFile()); 
    BufferedWriter bw = new BufferedWriter(fw); 

    for (int i = 0; i < listOfFiles.length; i++) { 

     if (listOfFiles[i].isFile()) { 
      files = listOfFiles[i].getName(); 
      System.out.println(files); 
      bw.write(files); 
     } 
    } 

    bw.close(); 
    return ""; 
}