java - 读/写文件不会写入输出

Question

我正在编写一个程序，该程序从一个文件读取输入，然后该程序将格式化数据并将其写入另一个文件。

输入文件:

Christopher kardaras,10 N Brainard,Naperville,IL,60566 George Washington,30 W Jackson,Chicago,IL,60060

输出文件:

Christopher kardaras 10 N Brainard Naperville, IL 60566

George Washington 30 W Jackson Chicago, IL 60060

当我运行代码时，输​​出未显示在输出文件中，以下是我的代码。

    //open input, output files
    FileReader freader = new FileReader("AddressData.txt");
    BufferedReader inFile = new BufferedReader(freader);

    FileWriter fwriter=new FileWriter("FormattedData.text");
    PrintWriter outFile= new PrintWriter (fwriter);

    //process data - get a line, separate into fields, then print
    //address label to the output file

    line= inFile.readLine();
    while (line != null)
    {
        //Create a new scanner, use comma as field separator
        Scanner s = new Scanner(line).useDelimiter(",");

        // SOME CODE OMITTED HERE FOR BREVITY
        out.printf(...);

        //get the next line. read failure (EOF) will exit the loop
        line = inFile.readLine();
    }

    //clean up
    inFile.close();
    outFile.close();

Answer 1

尝试flushing关闭之前的 outFile。

outFile.flush();

您还可以使用alternative PrintWriter constructor它会为您解决这个问题:

public PrintWriter(OutputStream out, boolean autoFlush)