在java中找到两次的区别 [英] Find the difference between two times in java

问题描述

我有一个搜索按钮，当用户点击搜索按钮时，search（）方法被调用。我需要计算在Google搜索中看到的结果向用户显示的时间。

I have a search button, when the user clicks the search button the search() method is get called. I need to calculate the how much time it took to display the result to the user as we see in the google search.

这是我的代码。

        SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String strDate;
def startTime() { 
    Calendar cal = Calendar.getInstance();
    System.out.println("Current milliseconds since 13 Oct, 2008 are :"
    + cal.getTimeInMillis());
    long startTime=cal.getTimeInMillis();
    /*Date startNow = new Date();
    strDate = sdfDate.format(startNow);
    Date startTime=sdfDate.parse(strDate);
    print "startTime"+startTime*/
    return  startTime;

}
def endTime(){
    Calendar cal = Calendar.getInstance();
    System.out.println("Current milliseconds  :"
    + cal.getTimeInMillis());
    long endTime=cal.getTimeInMillis();
    /*Date endNow = new Date();
    print "endNow"+endNow
    strDate = sdfDate.format(endNow);
    Date endTime=sdfDate.parse(strDate);
    print "endTime"+endTime*/
    return endTime;
}

def differenceTime(long startTime,long endTime){
    print "requestEndTime"+endTime
    print "requestStartTime"+startTime
    long timeDifference = endTime - startTime;
    return timeDifference;
}

这里我试图获得开始时间和结束时间，并尝试计算差额。我知道我的方式是否正确？请通常告诉我如何计算时差。

Here I am trying to get the starttime and endtime and trying to calculate the difference. I do know whether the way I implemented is right? Please tell me usually how the time difference is being calculated.

推荐答案

而不是使用日历它更容易使用 System.currentTimeMillis（）：

Instead of using Calendar it's easier to use System.currentTimeMillis():

def startTime() { 
    long startTime=System.currentTimeMillis();
    return  startTime;
}

基于System.currentTimeMillis（）计算时差在Java中非常常见，你会做正确的（我的意思是 endTime - startTime ）

Calculating time difference based on System.currentTimeMillis() is very common in Java, and you'll doing it right (I mean endTime - startTime)

所以，你的代码可能看起来像：

So, your code could looks like:

long startTime = System.currentTimeMillis();
// .....
// processing request
// .....
long endTime = System.currentTimeMillis();
long differenceTime = endTime - startTime;
log.debug("Request time: " + differenceTime);
//or
log.debug("Request time: " + TimeUnit.MILLISECONDS.toSeconds(differenceTime) + " sec");

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