用 Java 命名文件以包含日期和时间戳 [英] Name a file in Java to include date and time stamp

问题描述

我正在使用 NetBeans 将数据导出到 Java 应用程序中的文件中.该文件将具有我在代码中指定的硬编码名称.请在代码下方找到.

I am exporting data into a file in a Java application using NetBeans. The file will have a hard coded name given by me in the code. Please find below the code.

private static String FILE = "D:\Report.pdf";

我想将日期和时间戳附加到生成的文件名，以便创建的每个文件都是唯一的文件.如何实现这一目标?

I want to append date and time stamp to the file name generated so that each file created is a unique file. How to achieve this?

推荐答案

使用 SimpleDateFormat 并拆分以保留文件扩展名:

Use SimpleDateFormat and split to keep file extension:

private static String FILE = "D:Report.pdf";
DateFormat df = new SimpleDateFormat("yyyyMMddhhmmss"); // add S if you need milliseconds
String filename = FILE.split(".")[0] + df.format(new Date()) + FILE.split(".")[1];
// filename = "D:Report20150915152301.pdf"

更新:
如果你能够修改FILE变量，我的建议是:

private static String FILE_PATH = "D:Report";
private static String FILE_EXTENSION = ".pdf";
DateFormat df = new SimpleDateFormat("yyyyMMddhhmmss"); // add S if you need milliseconds
String filename = FILE_PATH + df.format(new Date()) + "." + FILE_EXTENSION;
// filename = "D:Report20150915152301.pdf"

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