如何使用 JSTL 对表示 URL 路径的字符串进行编码? [英] How to encode a String representing URL path with JSTL?

问题描述

使用 JSTL 对表示 URL 路径(不是请求参数)的字符串进行 URL 编码的最佳方法是什么?

What is the best way to URL-encode a String representing URL path (not request parameter) with JSTL?

<c:url value="/user/${user.name}"/>

根据我找到的任何文档，这应该照顾它.但事实并非如此.它对参数进行了精美的编码 (<c:url value="/user/${user.name}"><c:param name="section" value="employment 4u so good"/><<;/c:url>) 但我没有传递任何参数.如何安全地编码一个简单的 URL，就像上面一样，而不用担心 ${user.name} 可能是什么?

According to any documentation I find, this should take care of it. But it does not. It encodes parameters beautifully (<c:url value="/user/${user.name}"><c:param name="section" value="employment 4u so good"/></c:url>) but I'm not passing any parameters. How can I safely encode a simple URL, like above, without fear of what ${user.name} could be?

推荐答案

<c:url> 不会按照其值中指定的方式对 URI 进行编码，而只是对指定的 URL 请求参数进行编码通过嵌套的 .您链接的 IBM 文章也没有说明.我认为您将它与URL 重写"混淆了(本质上只不过是在必要时附加 jsessionid). 确实在禁用 cookie 时也能做到这一点.

The <c:url> does not encode the URI as specified in its value, but just URL request parameters which are specified by a nested <c:param>. The IBM article which you linked also doesn't tell otherwise. I think that you confused it with "URL rewriting" (which is in essence nothing more than appending the jsessionid whenever necessary). The <c:url> indeed does that as well when cookies are disabled.

为了实现您的要求，对路径参数进行 URI 编码，最好是创建一个自定义的 EL 函数，该函数委托给 URLEncoder#encode() 并改变结果符合 URI 规则.

To achieve your requirement, of URI-encoding the path parameters, best is to create a custom EL function which delegates to URLEncoder#encode() and alters the outcome conform URI rules.

<a href="/user/${util:encodeURI(user.name)}">view profile</a>

与

public static String encodeURI(String value) throws UnsupportedEncodingException {
    return URLEncoder.encode(value, "UTF-8")
        .replace("+", "%20")
        .replace("%21", "!")
        .replace("%27", "'")
        .replace("%28", "(")
        .replace("%29", ")")
        .replace("%7E", "~");
}

在 这个答案的第二部分 您可以找到一个基本的启动示例，说明如何声明和注册自定义 EL 函数.

In the 2nd part of this answer you can find a basic kickoff example how to declare and register custom EL functions.

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