需要在Java中获取当前时间戳 [英] Need to get current timestamp in Java

问题描述

我需要获取Java中的当前时间戳，格式为 MM / DD / YYYY h：mm：ss AM / PM ，

I need to get the current timestamp in Java, with the format of MM/DD/YYYY h:mm:ss AM/PM,

例如： 06/01/2000 10:01:50 AM

我需要它是Threadsafe。

I need it to be Threadsafe as well.

我可以使用这样的东西吗？

Can I utilize something like this?

java.util.Date date = new java.util.Date();
System.out.println(new Timestamp(date.getTime()));

或链接这里。

推荐答案

SimpleDateFormat 不应该是一个问题，如果你只是创建它在与使用它相同的方法块。换句话说，您不是将其分配为类的静态或实例变量，并以一种或多种可由多个线程调用的方法重用它。只有这样才能暴露出 SimpleDateFormat 的线程安全。但是，您可以在与当前线程访问的方法块相同的方法块中安全地重复使用相同的 SimpleDateFormat 实例。

The threadunsafety of SimpleDateFormat should not be an issue if you just create it inside the very same method block as you use it. In other words, you are not assigning it as static or instance variable of a class and reusing it in one or more methods which can be invoked by multiple threads. Only this way the threadunsafety of SimpleDateFormat will be exposed. You can however safely reuse the same SimpleDateFormat instance within the very same method block as it would be accessed by the current thread only.

此外，您在此使用的 java.sql.Timestamp 类不应该被滥用，因为它是特定于JDBC API的，以便能够存储或在SQL数据库中检索 TIMESTAMP / DATETIME 列类型，并将其从/转换为 java.util.Date 。

Also, the java.sql.Timestamp class which you're using there should not be abused as it's specific to the JDBC API in order to be able to store or retrieve a TIMESTAMP/DATETIME column type in a SQL database and convert it from/to java.util.Date.

所以，这应该是：

Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy h:mm:ss a");
String formattedDate = sdf.format(date);
System.out.println(formattedDate); // 12/01/2011 4:48:16 PM

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