JSP trimDirectiveWhitespaces [英] JSP trimDirectiveWhitespaces
问题描述
我正在测试几种改善和减少响应大小，网络流量和加载时间的方法. 我想使用的一件事是trimDirectiveWhitespaces元素. 我将其放在page指令中:
I am testing several ways to improve and reduce my response size, network traffic, and load time. One of the things I thought of using is the trimDirectiveWhitespaces element. I placed it in the page directive:
<%@ page contentType="text/html;charset=UTF-8" language="java" trimDirectiveWhitespaces="true"%>
我添加了一些空的新行，但在响应中没有看到任何变化，或者当我查看文档源时，那里有新行.
I added some empty new lines and didn't see any change in my response or when i view source of the document, new lines were there.
此方法的正确用法是什么?我在做什么错了?
What is the correct usage of this and what am I doing wrong?
推荐答案
trimDirectiveWhitespaces 仅删除JSP标记周围的空行，并保留其他空行.
trimDirectiveWhitespaces only removes empty lines around JSP tags and leaves other empty lines as they are.
示例:
<% page pageEncoding="UTF-8"%>X
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>X
<html>
<head>
它将变为:
X
X
<html>
<head>
(请注意，在此示例中，我添加了X来标记行尾，因此更明显，并且stackoverflow不会将其修剪掉)
(note I added X to mark end-of-line for this example, so it is more obvious and stackoverflow wont trim them out)
如果在page指令中添加了trimDirectiveWhitespaces="true"，则输出将变为:
If trimDirectiveWhitespaces="true" is added to the page directive, the output becomes:
<html>
<head>
删除了前两行，但保留了后两行(在html和head标记之间).
The first two empty lines are removed, but the next two (between the html and head tags) are preserved.
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