将时间戳添加到文件 JAVA

Question

在控制台中，在 eclipse 中，弹出当前时间戳，我可以在它旁边键入我想要放入文件中的任何内容。

如何让时间戳也打印在文件中！？！？

    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.util.Scanner;
    import java.sql.Timestamp;
    import java.util.Date;
    public class bufferedwriter {    
    public static void main(String[] args) {

        Scanner myScanner = new Scanner(System.in);
        String lineToPrint = "";
        String fileName = "/Users/josephbosco/fileName.txt";

        do{
            java.util.Date date= new java.util.Date();
            System.out.print(new Timestamp(date.getTime()));

             lineToPrint = myScanner.nextLine();                 
            printToFile (fileName, lineToPrint);                

        } while (!lineToPrint.equalsIgnoreCase("q") );          

    }

    public static void printToFile (String myfileName, String message) {        

        try {
            File outfile = new File(myfileName);

            //if file doesn't exist, then create it

            if (!outfile.exists()) {
                System.out.println("No file exists...writing a new file");
                outfile.createNewFile();

            }
            FileWriter fw = new FileWriter(outfile.getAbsoluteFile(), true);
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write(message);

            bw.flush(); 
            bw.close();

            System.out.println("Done");

            } catch (IOException e) {
                e.printStackTrace();                    
        }    
    }    
}

Answer 1

每次调用 bw.write(message); 只需添加以下内容：

bw.write(new Timestamp(new java.util.Date().getTime()).toString());

Answer 2

您的代码当前正在 print 语句中实例化一个新的 Timestamp 对象。问题是您没有将该时间戳存储到变量中，以便在尝试将其写入文件时可以再次引用它。

do{
    java.util.Date date= new java.util.Date();
    System.out.print(new Timestamp(date.getTime()));


    lineToPrint = myScanner.nextLine();

    printToFile (fileName, lineToPrint);


} while (!lineToPrint.equalsIgnoreCase("q") );

将 Timestamp 对象存储到变量中允许您在打印语句中引用该变量；这也使得 timestamp 变量和 lineToPrint 变量的连接更容易编码。下面修改后的代码显示了这些更改。

do{
    java.util.Date date= new java.util.Date();

    // Initialize variable and store new Timestamp object
    Timestamp timestamp = new Timestamp(date.getTime()));

    System.out.print(timestamp)
    lineToPrint = myScanner.nextLine();

    // Concatenate the two variables
    printToFile (fileName, timestamp + " " + lineToPrint);


} while (!lineToPrint.equalsIgnoreCase("q") );

将时间戳添加到文件 JAVA

Add Timestamp to file JAVA

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timestamp