java - 无法写入文件扫描仪 try/catch Java

Question

当我运行这个程序时，它意味着写入文本文件，该文本文件位于与我的项目文件夹相同的目录中。

try
{                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Scanner inFile = new Scanner(new File ("details.txt"));
while(inFile.hasNext())
{
String line = inFile.nextLine(); //reads the line of text
Scanner del = new Scanner(line).useDelimiter("#"); //scanner class to delimit
String name = del.next();
String gender = del.next();
int age = del.nextInt();
double amount = del.nextDouble();
txaDisplay.append(name+"\t"+gender+"\t"+age+"\t"+amount+"\n");
del.close();
}
inFile.close();//end try
}
catch(FileNotFoundException f)
    {
    txaDisplay.append("File Not Found");
    System.exit(0);}
}                                        


public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new yest().setVisible(true);
        }
    });}

Answer 1

您需要实际写入文件。这是我为刚接触文件输出的人提供的一个示例。这使用 FileWriter 输出流。注意这里的Data是一个ArrayList。

public static void WriteFile(File file)
{
    System.out.println("Writing to file");
    //Use a FileWriter to output to file
    FileWriter oFile = null;
    try
    {
        oFile = new FileWriter(file, false); //Set to true if you don't want to overwrite existing contents in file

        // Begin writing to file... line by line
        for (String line : Data)
            oFile.write(line + System.getProperty("line.separator")); //Since notepad doesn't display newline characters (\n) use this
                                                                      //If using another text document viewer then just use + "\n"
        //Flush and close output stream
        oFile.flush();
        oFile.close();
    } catch (IOException e)
    {
        // Handle it!
        e.printStackTrace();
    }
}