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怎么修改java源文件修改日期

我是芄兰 2023-09-06 阅读 61

要修改Java源文件的修改日期,可以使用Java的File类和Calendar类来实现。

  1. 首先,需要创建一个File对象,用于表示要修改的源文件。可以使用File类的构造函数来指定源文件的路径和文件名。例如:

    File file = new File("path/to/your/file.java");
    
  2. 接下来,需要获取当前的日期和时间。可以使用Calendar类来获取当前的年、月、日、小时、分钟和秒数。例如:

    Calendar calendar = Calendar.getInstance();
    int year = calendar.get(Calendar.YEAR);
    int month = calendar.get(Calendar.MONTH) + 1;
    int day = calendar.get(Calendar.DAY_OF_MONTH);
    int hour = calendar.get(Calendar.HOUR_OF_DAY);
    int minute = calendar.get(Calendar.MINUTE);
    int second = calendar.get(Calendar.SECOND);
    
  3. 然后,可以使用Calendar类的set方法来修改File对象的最后修改日期。需要注意的是,Calendar类的月份从0开始,因此需要将获取的月份加1。例如:

    calendar.set(Calendar.YEAR, year);
    calendar.set(Calendar.MONTH, month - 1);
    calendar.set(Calendar.DAY_OF_MONTH, day);
    calendar.set(Calendar.HOUR_OF_DAY, hour);
    calendar.set(Calendar.MINUTE, minute);
    calendar.set(Calendar.SECOND, second);
    long modifiedTime = calendar.getTimeInMillis();
    file.setLastModified(modifiedTime);
    
  4. 最后,使用File类的lastModified方法来验证修改日期是否成功。例如:

    long lastModified = file.lastModified();
    calendar.setTimeInMillis(lastModified);
    int modifiedYear = calendar.get(Calendar.YEAR);
    int modifiedMonth = calendar.get(Calendar.MONTH) + 1;
    int modifiedDay = calendar.get(Calendar.DAY_OF_MONTH);
    int modifiedHour = calendar.get(Calendar.HOUR_OF_DAY);
    int modifiedMinute = calendar.get(Calendar.MINUTE);
    int modifiedSecond = calendar.get(Calendar.SECOND);
    

    可以通过打印输出来检查修改日期是否与当前日期一致。例如:

    System.out.println("Modified date: " + modifiedYear + "-" + modifiedMonth + "-" + modifiedDay + " " + modifiedHour + ":" + modifiedMinute + ":" + modifiedSecond);
    

以下是完整的示例代码:

import java.io.File;
import java.util.Calendar;

public class ModifyFileDate {
    public static void main(String[] args) {
        File file = new File("path/to/your/file.java");

        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);
        int second = calendar.get(Calendar.SECOND);

        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month - 1);
        calendar.set(Calendar.DAY_OF_MONTH, day);
        calendar.set(Calendar.HOUR_OF_DAY, hour);
        calendar.set(Calendar.MINUTE, minute);
        calendar.set(Calendar.SECOND, second);
        long modifiedTime = calendar.getTimeInMillis();
        file.setLastModified(modifiedTime);

        long lastModified = file.lastModified();
        calendar.setTimeInMillis(lastModified);
        int modifiedYear = calendar.get(Calendar.YEAR);
        int modifiedMonth = calendar.get(Calendar.MONTH) + 1;
        int modifiedDay = calendar.get(Calendar.DAY_OF_MONTH);
        int modifiedHour = calendar.get(Calendar.HOUR_OF_DAY);
        int modifiedMinute = calendar.get(Calendar.MINUTE);
        int modifiedSecond = calendar.get(Calendar.SECOND);

        System.out.println("Modified date: " + modifiedYear + "-" + modifiedMonth + "-" + modifiedDay + " " + modifiedHour + ":" + modifiedMinute + ":" + modifiedSecond);
    }
}

通过运行上述代码,可以修改Java源文件的修改日期,并验证修改日期是否成功。

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