从JSP进行XML声明之前的空白 [英] Whitespace before XML declaration from JSP
问题描述
我正在尝试对JSP输出进行完整的XHTML过渡验证，但是遇到了麻烦.标题的顶部看起来像这样:
I'm trying to achieve full XHTML transitional validation of my JSP output but I've hit a snag. The top of the header looks like this:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
它包含在如下语句中:
<jsp:include>
<jsp:attribute name="page"><owportal:page name="/style/portal/header.jsp" /></jsp:attribute>
</jsp:include>
< owportal:page>标签会检查一些不同的路径，以便在需要时可以使用特定于项目的标头覆盖它.这样做的问题是，必须先声明owportal taglib，然后才能使用它，在XML声明之前插入空白行并引起验证警告.
The <owportal:page> tag checks a few different paths so that we can override it with a project-specific header if need be. The problem with this is the owportal taglib needs to be declared before it can be used, inserting a blank line before the XML declaration and causing a validation warning.
我尝试使用jsp:output来生成XML声明，运气不佳.有人可以告诉我我是否在正确的轨道上吗?
I have tried using jsp:output to generate an XML declaration without much luck. Can anyone let me know if I'm on the right track here?
更新:
目前我正在尝试类似的事情
Currently I'm trying something like this
<%@ taglib uri="/WEB-INF/yadda/yadda" prefix="yadda" %>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns="http://www.w3.org/1999/xhtml" version="2.0">
<jsp:output omit-xml-declaration="false" doctype-root-element="html"
doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"/>
</jsp:root>
<html>...
< jsp:root>上出现错误无效的标准动作".线.不是最有用的错误消息.听起来好像我以某种方式使用了错误的标签.我正在运行Tomcat 6，因此JSP版本应该不会有问题.有人可以看到我在做什么吗?是< jsp:root>打算包裹< html>?
And I am getting an error "Invalid standard action" at the <jsp:root> line. Not the most helpful error message. Sounds like I'm using the tag wrong somehow perhaps. I'm running Tomcat 6 so it shouldn't be a problem with the JSP version. Can anyone see what I'm doing wrong? Is <jsp:root> meant to wrap around <html>?
推荐答案
如果我对您的理解正确，那么您尝试在JSP的最顶部包含这个jsp:include，但是在此过程中，您正在引起JSP会在XML序言之前的顶部输出一些空白.
If I understand you correctly, then you are trying to include this jsp:include at the very top of the JSP, but, in the process, you are causing the JSP to output a few bits of whitespace at the top before the XML preamble.
在这种情况下，我只是要确保JSP那里没有空格:
In cases like this, I have just resorted to making sure the JSP has no whitespace up there:
<jsp:include><jsp:attribute name="page"><owportal:page name="/style/portal/header.jsp" /></jsp:attribute></jsp:include>[your content continues here, not on next line!]...
但是我认为您在问一个不同的问题，即如何告诉JSP输出XML声明.为此，您想从这样的东西开始(假设这里您使用的是最新的JSP规范，例如2.1)...
But I think you are kind of asking a different question, which is how to tell a JSP to output an XML declaration. To do that, you want to start with something like this (assuming here you're using a recent JSP spec like 2.1)...
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" xmlns="http://www.w3.org/1999/xhtml" version="2.1">
<jsp:output
omit-xml-declaration="false" doctype-root-element="html"
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"/>
...
这是处理从JSP(X)文件输出XML的更正确的方法-更明确.
This is the more right way to handle outputting XML from a JSP(X) file -- more explicit.
这篇关于从JSP进行XML声明之前的空白的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
