blocks|key|2963238|text|在JSP语言中，您通常希望使用JSTL+来实现这一点。当然，您也可以使用SimpleDateFormat添加一个scriptlet，但是scriptlet从2003年就开始使用strongly+discouraged了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2963239|假设${bean.date}返回java.util.Date，下面介绍如何使用它：|2963240|<%25@+taglib+prefix="fmt"+uri="http://java.sun.com/jsp/jstl/fmt"+%25>
...
<fmt:formatDate+value="${bean.date}"+pattern="yyyy-MM-dd+HH:mm:ss"+/>|code-block|syntax|javascript|2963241|如果您实际使用的是java.util.Calendar，那么可以调用它的getTime()方法来获取<fmt:formatDate>可以接受的java.util.Date：|2963242|<fmt:formatDate+value="${bean.calendar.time}"+pattern="yyyy-MM-dd+HH:mm:ss"+/>|2963243|或者，如果你实际上将日期保存在java.lang.String中(这表明模型中存在一个严重的设计错误；你真的应该修复你的模型，将日期存储为java.util.Date而不是java.lang.String!)，以下是如何在JSTL+的帮助下从一种日期字符串格式(如MM/dd/yyyy+)转换为另一种日期字符串格式(如yyyy-MM-dd+)。|2963244|<fmt:parseDate+pattern="MM/dd/yyyy"+value="${bean.dateString}"+var="parsedDate"+/>
<fmt:formatDate+value="${parsedDate}"+pattern="yyyy-MM-dd"+/>|2963245|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/tags/jstl/info|1|https://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files^0|10|G|F|4|0|2G|K|1|0|2|C|G|E|0|0|9|I|10|9|1E|G|1Z|E|0|0|F|G|1X|E|2E|G|3O|A|4F|A|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|F|3|G|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1I|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1S|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1T|8|@$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]|$9|1Y|A|1Z|B|C]|$9|20|A|21|B|C]|$9|22|A|23|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|24|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|25|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]]]

In JSP, you'd normally like to use <a href="https://stackoverflow.com/tags/jstl/info">JSTL</a> <a href="http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fmt/formatDate.html" rel="noreferrer"><code>&lt;fmt:formatDate&gt;</code></a> for this. You can of course also throw in a scriptlet with <code>SimpleDateFormat</code>, but scriptlets are <a href="https://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files">strongly discouraged</a> since 2003.

Assuming that <code>${bean.date}</code> returns <code>java.util.Date</code>, here's how you can use it:

<pre class="lang-xml prettyprint-override"><code>&lt;%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %&gt;
...
&lt;fmt:formatDate value="${bean.date}" pattern="yyyy-MM-dd HH:mm:ss" /&gt;
</code></pre>

If you're actually using a <code>java.util.Calendar</code>, then you can invoke its <code>getTime()</code> method to get a <code>java.util.Date</code> out of it that <code>&lt;fmt:formatDate&gt;</code> accepts:

<pre class="lang-xml prettyprint-override"><code>&lt;fmt:formatDate value="${bean.calendar.time}" pattern="yyyy-MM-dd HH:mm:ss" /&gt;
</code></pre>

Or, if you're actually holding the date in a <code>java.lang.String</code> (this indicates a serious design mistake in the model; you should really fix your model to store dates as <code>java.util.Date</code> instead of as <code>java.lang.String</code>!), here's how you can convert from one date string format e.g. <code>MM/dd/yyyy</code> to another date string format e.g. <code>yyyy-MM-dd</code> with help of JSTL <a href="http://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/fmt/parseDate.html" rel="noreferrer"><code>&lt;fmt:parseDate&gt;</code></a>.

<pre class="lang-xml prettyprint-override"><code>&lt;fmt:parseDate pattern="MM/dd/yyyy" value="${bean.dateString}" var="parsedDate" /&gt;
&lt;fmt:formatDate value="${parsedDate}" pattern="yyyy-MM-dd" /&gt;
</code></pre>

blocks|key|270351|text|您可以使用SimpleDateFormat类来完成此操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|270352|SimpleDateFormat+formatter=new+SimpleDateFormat("yyyy-MM-dd+HH:mm:ss");

String+dates=formatter.format(mydate);
//mydate+is+your+date+object|code-block|syntax|javascript|270353|entityMap^0|5|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can do that using the <code>SimpleDateFormat</code> class.

<pre><code>SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String dates=formatter.format(mydate);
//mydate is your date object
</code></pre>

blocks|key|3177042|text|上面的示例使用...sun.com/jsp/jstl/format显示导入是不正确的(这意味着它不适用于我)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3177043|请尝试下面的-this+import语句是否有效|3177044|<%25@+taglib+uri="http://java.sun.com/jstl/core"+prefix="c"+%25><%25@+taglib+uri="http://java.sun.com/jstl/core-rt"+prefix="c-rt"+%25><%25@+taglib+uri="http://java.sun.com/jstl/fmt"+prefix="fmt"+%25>
<html>
++<head>
++++<title>Format+Date</title>
++</head>

++<body>
++++<c-rt:set+var="now"+value="<%25=new+java.util.Date()%25>"+/>

++++<table+border="1"+cellpadding="0"+cellspacing="0"
++++style="border-collapse:+collapse"+bordercolor="#111111"
++++width="63%25"+id="AutoNumber2">
++++++<tr>
++++++++<td+width="100%25"+colspan="2"+bgcolor="#0000FF">
++++++++++<p+align="center">
++++++++++++
++++++++++++++<font+color="#FFFFFF"+size="4">Formatting:+
++++++++++++++<fmt:formatDate+value="${now}"+type="both"
++++++++++++++timeStyle="long"+dateStyle="long"+/>
++++++++++++++
++++++++++++
++++++++++
++++++++</td>
++++++</tr>|code-block|syntax|javascript|3177045|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The example above showing the import with ...sun.com/jsp/jstl/format is incorrect (meaning it didn't work for me).

Instead try the below -this import statement is valid

<pre><code>&lt;%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %&gt;&lt;%@ taglib uri="http://java.sun.com/jstl/core-rt" prefix="c-rt" %&gt;&lt;%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt" %&gt;
&lt;html&gt;
 &lt;head&gt;
 &lt;title&gt;Format Date&lt;/title&gt;
 &lt;/head&gt;

 &lt;body&gt;
 &lt;c-rt:set var="now" value="&lt;%=new java.util.Date()%&gt;" /&gt;

 &lt;table border="1" cellpadding="0" cellspacing="0"
 style="border-collapse: collapse" bordercolor="#111111"
 width="63%" id="AutoNumber2"&gt;
 &lt;tr&gt;
 &lt;td width="100%" colspan="2" bgcolor="#0000FF"&gt;
 &lt;p align="center"&gt;
 &lt;b&gt;
 &lt;font color="#FFFFFF" size="4"&gt;Formatting: 
 &lt;fmt:formatDate value="${now}" type="both"
 timeStyle="long" dateStyle="long" /&gt;
 &lt;/font&gt;
 &lt;/b&gt;
 &lt;/p&gt;
 &lt;/td&gt;
 &lt;/tr&gt;
</code></pre>

blocks|key|2963323|text|<%25@+page+language="java"+contentType="text/html;+charset=UTF-8"
+pageEncoding="UTF-8"%25>
+<!DOCTYPE+html>
+<html+dir="ltr"+lang="en-US">
+<head>
+<meta+charset="UTF-8"+/>
++<title>JSP+with+the+current+date</title>
++</head>
+<body>
+<%25java.text.DateFormat+df+=+new+java.text.SimpleDateFormat("dd/MM/yyyy");+%25>
<h1>Current+Date:+<%25=+df.format(new+java.util.Date())+%25>+</h1>
</body>
</html>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2963324|输出:当前日期:+10/03/2010|unstyled|2963325|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>&lt;%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%&gt;
 &lt;!DOCTYPE html&gt;
 &lt;html dir="ltr" lang="en-US"&gt;
 &lt;head&gt;
 &lt;meta charset="UTF-8" /&gt;
 &lt;title&gt;JSP with the current date&lt;/title&gt;
 &lt;/head&gt;
 &lt;body&gt;
 &lt;%java.text.DateFormat df = new java.text.SimpleDateFormat("dd/MM/yyyy"); %&gt;
&lt;h1&gt;Current Date: &lt;%= df.format(new java.util.Date()) %&gt; &lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

Output: Current Date: 10/03/2010

blocks|key|2963327|text|Date+td+=+new+Date();
String+b+=+new+String("");
SimpleDateFormat+format+=+new+SimpleDateFormat("YYYY/MM/dd");
b+=+format.format(td);
out.println(b);+++++++++++|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2963328|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Date td = new Date();
String b = new String("");
SimpleDateFormat format = new SimpleDateFormat("YYYY/MM/dd");
b = format.format(td);
out.println(b); 
</code></pre>

blocks|key|264866|text|<%25@page+import="java.text.SimpleDateFormat"%25>
<%25@page+import="java.util.Date"%25>
<%25@page+import="java.util.Locale"%25>

<html>
<head>
<title>Date+Format</title>
</head>
<body>
<%25
String+stringDate+=+"Fri+May+13+2011+19:59:09+GMT+0530";
Date+stringDate1+=+new+SimpleDateFormat("EEE+MMM+dd+yyyy+HH:mm:ss+Z",+Locale.ENGLISH).parse(stringDate);
String+stringDate2+=+new+SimpleDateFormat("yyyy-MM-dd+HH:mm:ss").format(stringDate1);

out.println(stringDate2);
%25>
</body>
</html>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|264867|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;%@page import="java.text.SimpleDateFormat"%&gt;
&lt;%@page import="java.util.Date"%&gt;
&lt;%@page import="java.util.Locale"%&gt;

&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Date Format&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;%
String stringDate = "Fri May 13 2011 19:59:09 GMT 0530";
Date stringDate1 = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss Z", Locale.ENGLISH).parse(stringDate);
String stringDate2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(stringDate1);

out.println(stringDate2);
%&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

From my JSP Page, I am getting <code>Date</code> in this format.

<blockquote>
 Fri May 13 2011 19:59:09 GMT 0530 (India Standard Time) 
</blockquote>

How can I convert this to the pattern <code>yyyy-MM-dd HH:mm:ss</code>?

Convert and format a Date in JSP

从我的JSP Page中，我得到了这种格式的Date。2011年5月13日星期五格林尼治时间0530 (印度标准时间) 19:59:09  如何将其转换为模式yyyy-MM-dd HH:mm:ss

问在JSP中转换和格式化日期
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