如何读取文本文件并使用JoptionPane显示它？

Question

我试图在用户输入并将其存储在文本文件中，我能够接受输入并存储它，但现在我试图在JOptionPane窗口中显示该输入。有人可以帮帮我吗。我是stackflow的新手，这是我的第一篇文章。

/*Here i am taking in user input and storing it in a file called "dictionary.txt".*/ 
public static String addNewWord()throws IOException 
{ 
    String newWord = ""; 

    newWord = JOptionPane.showInputDialog(null, "Enter the word you want to add to your dictionary."); 

    FileWriter aDictionary = new FileWriter("dictionary.txt", true); 
    PrintWriter out = new PrintWriter(aDictionary); 
    out.println(newWord); 
    out.close(); 
    aDictionary.close(); 

    return newWord; 
} 
/* Now i am trying to read "dictionary.txt" and display it using JOptionPane*/ 
public static String listDictionary()throws IOException 
{ 
    FileReader aDictionary = new FileReader("dictionary.txt"); 
    String aLineFromFile = FileReader; 
    JOptionPane.showMessageDialog(null, aLineFromFile); 
    aDictionary.close(); 

    return aLineFromFile; 
} 

Answer 1

您应该使用BufferedReader读取数据回从文件：

public static void listDictionary()throws IOException 
{ 
    BufferedReader br = new BufferedReader(new FileReader("dictionary.txt")); 
    String aLineFromFile = null; 
    while ((aLineFromFile = br.readLine()) != null){ 
      JOptionPane.showMessageDialog(null, aLineFromFile); 
    }   
    br.close(); 
    return; 
}