顯示日期差異在jsp

我有一個數據庫中的日期字段存儲沒有時間的日期。現在我想知道當前日期和我的日期字段在jsp頁面中顯示的天數差異。顯示日期差異在jsp

所以我應該有一個像

databaseDate(2012-11-30) - currentDate(2012-11-27) = 3 days

來源

2012-11-27 user965884

注意，今天是11月27日，而不是11月30日。 – BalusC

感謝您糾正我BalusC。我修改了我的問題 – user965884

有沒有像在標準JSTL。自定義EL功能將是您最好的選擇。

首先實現執行工作的一些靜態方法：

public final class Functions { 

    private Functions() {} 

    public static int daysBetween(Date before, Date after) { 
     // ... 
    } 

    public static int daysUntilToday(Date date) { 
     // ... 
    } 

}

如果您在/WEB-INF/functions.tld如下注冊它：

<?xml version="1.0" encoding="UTF-8" ?> 
<taglib 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" 
    version="2.1"> 

    <tlib-version>1.0</tlib-version> 
    <short-name>Custom_Functions</short-name> 
    <uri>http://example.com/functions</uri> 

    <function> 
     <name>daysBetween</name> 
     <function-class>com.example.Functions</function-class> 
     <function-signature>boolean daysBetween(java.util.Date, java.util.Date)</function-signature> 
    </function> 
    <function> 
     <name>daysUntilToday</name> 
     <function-class>com.example.Functions</function-class> 
     <function-signature>boolean daysUntilToday(java.util.Date)</function-signature> 
    </function> 
</taglib>

，那麼你就可以按如下方式使用它，只要該#{bean.date}返回一個完整的java.util.Date：

<%@taglib uri="http://example.com/functions" prefix="f" %> 

${f:daysUntilToday(bean.date)} days

該實施是自由選擇。我個人比較喜歡Joda Time：

public static int daysBetween(Date before, Date after) { 
    return Days.daysBetween(new DateTime(before.getTime()), new DateTime(after.getTime())).getDays(); 
} 

public static int daysUntilToday(Date date) { 
    return Days.daysBetween(new DateTime(date.getTime()), new DateTime()).getDays(); 
}

或者如果你僅限於標準的Java API，回落到衆所周知的Calendar樣板（不幸的是，JSR-310並沒有使它成爲Java 7中，我們」已經到wait對Java 8）：

public static int daysBetween(Date before, Date after) { 
    Calendar c1 = createCalendarWithoutTime(before); 
    Calendar c2 = createCalendarWithoutTime(after); 
    int days = 0; 

    for (;c1.before(c2); days++) { 
     c1.add(Calendar.DATE, 1); 
    } 

    return days; 
} 

public static int daysUntilToday(Date date) { 
    return daysBetween(date, new Date()); 
} 

private static Calendar createCalendarWithoutTime(Date date) { 
    Calendar calendar = Calendar.getInstance(); 
    calendar.setTime(date); 
    calendar.set(Calendar.HOUR_OF_DAY, 0); 
    calendar.set(Calendar.MINUTE, 0); 
    calendar.set(Calendar.SECOND, 0); 
    calendar.set(Calendar.MILLISECOND, 0); 
    return calendar; 
}

來源

2012-11-29 20:23:02 BalusC

你可以嘗試這樣的事情： -

<html> 
<head> 
<script> 
function dateDiff(dateform) { 
date1 = new Date(); 
date2 = new Date(); 

date1temp = new Date(dateform.firstdate.value); 
date1.setTime(date1temp.getTime()); 

date2temp = new Date(dateform.seconddate.value); 
date2.setTime(date2temp.getTime()); 

timediff = Math.abs(date1.getTime() - date2.getTime()); 
days = Math.floor(timediff/(1000 * 60 * 60 * 24)); 
dateform.difference.value = days; 
return false; 
} 
</script> 
</head>

來源

2012-11-27 16:24:00

「diff」對象究竟在這裏有用麼？ – BalusC

我很抱歉，但使用它是錯誤的？它只是觸動了我的腦海。如果我錯了，PLZ糾正我！ –

它沒有給出錯誤的結果，但在這裏完全沒有用處。你只是在同一時間設置/獲取。只要完全省略'diff'並直接將'Math.abs（）'的結果賦給'timediff'即可。另外請注意，這個語法是JavaScript，而OP則要求如何在JSP中執行它（這是基於Java的）。 – BalusC

Calendar calendar1 = Calendar.getInstance(); 
    Calendar calendar2 = Calendar.getInstance(); 
    calendar1.set(2007, 01, 10); 
    calendar2.set(2007, 07, 01); 

    long milliseconds1 = calendar1.getTimeInMillis(); 
    long milliseconds2 = calendar2.getTimeInMillis(); 
    long diff = milliseconds2 - milliseconds1; 
    long diffSeconds = diff/1000; 
    long diffMinutes = diff/(60 * 1000); 
    long diffHours = diff/(60 * 60 * 1000); 
    long diffDays = diff/(24 * 60 * 60 * 1000); 

    System.out.println("\nThe Date Different Example"); 
    System.out.println("Time in milliseconds: " + diff + " milliseconds."); 
    System.out.println("Time in seconds: " + diffSeconds + " seconds."); 
    System.out.println("Time in minutes: " + diffMinutes + " minutes."); 
    System.out.println("Time in hours: " + diffHours + " hours."); 
    System.out.println("Time in days: " + diffDays + " days.");

來源

2012-12-06 06:34:32 jayesh

顯示日期差異在jsp

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