Java 如何读取文本文件并使用JoptionPane显示它?
我尝试接收用户输入并将其存储在文本文件中,我能够接收输入并将其存储,但现在我尝试在Java 如何读取文本文件并使用JoptionPane显示它?,java,swing,ioexception,java-io,Java,Swing,Ioexception,Java Io,我尝试接收用户输入并将其存储在文本文件中,我能够接收输入并将其存储,但现在我尝试在JOptionPane窗口中显示该输入。谁能帮帮我吗。我是stackflow的新手,这是我的第一篇帖子 /*Here i am taking in user input and storing it in a file called "dictionary.txt".*/ public static String addNewWord()throws IOException { String newWord
JOptionPane
窗口中显示该输入。谁能帮帮我吗。我是stackflow的新手,这是我的第一篇帖子
/*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;
}
您应该使用
BufferedReader
从文件中读回数据:
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;
}
谢谢,如果是多行,我该怎么做?目前它只读取文本文件的一行。我已经更新了代码以反映读取多行,顺便说一句,我认为您不想从这个函数返回字符串。我也把它去掉了