自动在"System.out.println()"语句中显示日期 [英] Show date in 'System.out.println()' statement automatically

问题描述

我知道您打印的每一行都有可能用日期标记(也可以另存为日志文件).

I know that it is possible that every line you print can be tagged with date (and also saved as a log file).

例如在《我的世界》中:

For example in Minecraft:

[16:21:43 INFO]: Minecraft Launcher 1.3.9 (through bootstrap 5) started on windows...

我该怎么做? Maybee和Logger?还是需要外部库?

How do I do that? Maybee with Logger? Or are external librarys required?

推荐答案

可以通过调用System.out.println

1. 创建您的自定义PrintStream类
2. 覆盖println方法以为字符串加上日期前缀
3. 使用自定义PrintStream
设置System.setOut

1. Create your custom PrintStream class
2. Override println method to prefix the String with the date
3. Set System.setOut with your custom PrintStream

自定义流:

public class MyPrintStream extends PrintStream {

    public MyPrintStream(OutputStream out) {
        super(out);
    }

    @Override
    public void println(String string) {
        Date date = new Date();
        super.println("[" + date.toString() + "] " + string);
    }
}

测试类别:

 public static void main(String[] args) {
            System.setOut(new MyPrintStream(System.out));
            System.out.println("Hello World!");
                System.out.println("Yellow World!");
        }

输出:

[Mon Feb 10 21:10:14 IST 2014] Hello World!
[Mon Feb 10 21:10:14 IST 2014] Yellow World!

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