将一个字符串写入文件

Question

我有上面的代码.我想做的是在txt文件中写一个字符串.

     import java.io.*;
    import java.util.*;

    public void writeAsfalizomenos(asfalizomenos myObj) throws IOException {

    Scanner scanner = new Scanner(System.in);
    System.out.print("Surname: ");
    String username = scanner.nextLine();
    System.out.println(username);


    FileWriter outFile = new FileWriter("asdf.txt", true);
    PrintWriter out1 = new PrintWriter(outFile);

    out1.append(username);
    out1.println();
    out1.append("adfdas");



    //
    // Read string input for username
    //



}

public static void main(String [] args) throws IOException{


    asfalizomenos a = new asfalizomenos();
    a.writeAsfalizomenos(a);
}

上面的代码创建了一个txt文件,但它不会将字符串写入它.关于我的bug的任何想法？

Answer 1

你没有关闭或冲洗PrinterWriter或FileWriter.所以基本上它是缓冲的,所以没有任何东西被写入文件.

你应该在finally块中关闭它们:

FileWriter outFile = new FileWriter("asdf.txt", true);
try {
    PrintWriter out1 = new PrintWriter(outFile);
    try {
        out1.append(username);
        out1.println();
        out1.append("adfdas");
    } finally {
       out1.close();
    }
} finally {
   outFile.close();
}

关闭将自动刷新.

(我不记得了 - 关闭PrintWriter意志很可能会关闭FileWriter.不管怎么说,我个人喜欢明确它.)