JSP中UTF8编码的XHTML内容 [英] UTF8 encoded XHTML content in JSP
问题描述
我正在尝试在JSP页面中显示XHTML内容.编码为UTF8. jsp页面在java类中调用一个方法，该方法返回xhtml内容.基本上这就是我的jsp页面中的内容
I am trying to display XHTML content in a JSP page. The encoding is UTF8. The jsp page calls a method in a java class and the method returns the xhtml content. Basically this is what I have in my jsp page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd">
<% response.setContentType("application/xhtml+xml"); %>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
</head>
<body>
<% response.setContentType("application/xhtml+xml"); %>
<%=myJavaClass.getXHTML()%>
</body>
</html>
问题是某些字符显示为问号(?). 但是，如果Java类(myJavaClass)将相同的内容写入文件，则当我打开该文件并在文本编辑器中查看该文件时，所有字符都会正确显示. Tomcat的控制台还显示了所有正确字符的xhtml内容，只是在浏览器中我看到了问号.
The problem is that some characters show up as QuestionMarks (?). However, if the java class (myJavaClass) writes the same content to a file, all characters are displayed correctly when I open up the file and view it in a text editor. Tomcat's console also shows the xhtml content with all correct characters, only in the browser I am seeing question marks.
有人能想到发生这种情况的任何原因吗?
Can anyone think of any reason why this is happening?
推荐答案
有很多因素可以发挥作用.在您的特定情况下，您正在使用老式的 scriptlets 将XML字符串写入响应中. <%= foo %>隐式调用response.getWriter().write(foo).您还需要通过将以下内容添加到JSP的 top 中来设置响应编写器的字符编码:
There are lot of factors which can play a role. In your specific case you're using the old fashioned scriptlets to write the XML string to the response. The <%= foo %> implicitly calls response.getWriter().write(foo). You need to set the character encoding of the response writer as well by adding the following to top of your JSP:
<%@ page pageEncoding="UTF-8" %>
这将通过隐式调用response.setCharacterEncoding("UTF-8") 来将响应编码设置为UTF-8，并且还将添加相应的响应头(如果尚未完成的话).
This will set the response encoding to UTF-8 by implicitly calling response.setCharacterEncoding("UTF-8") and it will also add the appropriate response header if not done yet.
您真正需要考虑的所有因素是:
All factors which you really need to take into consideration are:
- 请求编码.对于GET请求，需要在appserver的配置中进行设置.对于POST请求，您需要使用
HttpServletRequest#setCharacterEncoding(). - 响应编码.这已经在这里回答了.
- 数据库编码.在SQL
CREATE中指定编码.
- Request encoding. For GET requests this needs to be set in appserver's configuration. For POST requests you need to use
HttpServletRequest#setCharacterEncoding(). - Response encoding. This is already answered here.
- Database encoding. Specify the encoding during SQL
CREATE.
有关更多背景信息和所有解决方案的详细概述，您可以找到这篇文章有用.
For more background information and an detailed overview of all solutions you may find this article useful.
也就是说，如果您已经在HTML头中设置了<meta http-equiv="content-type">，则行<% response.setContentType("application/xhtml+xml"); %>完全多余.摆脱它们，如果可能的话，也摆脱掉脚本.只需使用EL:
That said, the lines <% response.setContentType("application/xhtml+xml"); %> are completely superfluous if you already have set the <meta http-equiv="content-type"> in HTML head. Get rid of them and if possible also of the scriptlets. Just use EL:
${someBean.somePropertyReturningXmlString}
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