如何在jstl代码中混合href [英] How to mix href within jstl code

问题描述

当我使用下面的jstl代码

When I use the below jstl code

  <a href="http://mysite.com?id="<c:out value="${myid}"/>/><c:out value="${myid}"/></a> 

输出为:

"1234"

值1234对应于myid的变量值，但所生成的url为 " http://mysite.com?id= "，因此myid的值不会作为href.

The value 1234 corresponds to the variable value of myid but the url being generated is "http://mysite.com?id=" so no value for myid is being generated as part of the href.

如何修改href，以便显示整个href:

How can I amend the href so that entire href is displayed :

" http://mysite.com?id=1234 "

而不是:

" http://mysite.com?id= "

推荐答案

最终，JSP/JSTL生成HTML.您熟悉基本HTML ，对吗?

Ultimately, JSP/JSTL generates HTML. You're familiar with basic HTML, right?

通过右键单击浏览器中的查看源代码，更仔细地查看生成的HTML输出.您会看到:

Look closer at the generated HTML output by rightclick, View Source in browser. You'll see:

<a href="http://mysite.com?id="1234/>1234</a> 

有效 HTML吗?不，您在错误的位置使用"关闭属性值太早，而使用/>则关闭标签太早.看起来，Stack Overflow HTML语法荧光笔也感到困惑.相反，它应该是:

Is that valid HTML? No, you're closing the attribute value too soon with " at wrong place and you're closing the tag too soon with />. Look, the Stack Overflow HTML syntax highlighter also got confused. Instead, it should have been:

<a href="http://mysite.com?id=1234">1234</a> 

相应地修复HTML生成器(即JSP/JSTL代码)，以便生成所需的HTML:

Fix the HTML generator (i.e. the JSP/JSTL code) accordingly so that it generates the desired HTML:

<a href="http://mysite.com?id=<c:out value="${myid}"/>"><c:out value="${myid}"/></a> 

---

与具体问题无关，<c:out>仅有助于防止

---

Unrelated to the concrete problem, the <c:out> is only helpful in preventing XSS attack holes when redisplaying user-controlled input and actually the wrong tool to inline URL parameters. If you can guarantee that ${myid} is always a number (because it's a Long or Integer), you can even just leave it entirely out, making the code prettier to read:

<a href="http://mysite.com?id=${myid}">${myid}</a> 

但是如果不能保证${myid}是数字(因为它是String)，则应该使用<c:url>和<c:param>正确地

If the ${myid} is however not a guaranteed to be a number (because it's a String), then you should use <c:url> and <c:param> to properly URL-encode it:

<c:url value="http://mysite.com" var="myURL">
    <c:param name="id" value="${myid}" />
</c:url>
<a href="${myURL}"><c:out value="${myid}" /></a>

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