Google App Engine上的Catch-all URL重写（Java） [英] Catch-all URL rewrite on Google App Engine (Java)

问题描述

我正在尝试为GAE应用创建一个简短的网址，因此我使用了 UrlRewriteFilter ，但我无法正确设置它。基本上，用户得到这个：

I'm trying to create a short URL for a GAE app, so I used UrlRewriteFilter, but I can't get it set up correctly. Basically, the user is given this:

• test.com/012a-bc

以及应该重定向到的页面是

and the page that they should be redirected to is

• test.com/vote.jsp？ id = 012a-bc

目前正在使用 urlrewrite.xml 这样的文件：

At the moment it's working with the urlrewrite.xml file like this:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 4.0//EN" "http://www.tuckey.org/res/dtds/urlrewrite4.0.dtd">
<urlrewrite>

    <rule>
        <from>/([0-z]+)</from>
        <to last="true">/vote.jsp?id=$1</to>
    </rule>

</urlrewrite>

问题是所有网址现在都重定向到此，例如

The problem is that all URLs now redirect to this, so for example

• test.com/thankyou.jsp?id=0123

仍然在vote.jsp上运行页面。只有在找不到URL时，我该怎么做才能让它重定向？

still runs the page at vote.jsp. What should I do to get it to redirect only when the URL isn't found?

推荐答案

以下规则怎么办： / p>

What about the following rule:

<rule>
   <from>^/([\w-]+)$</from>
   <to last="true">/vote.jsp?id=$1</to>
</rule>

其中 [\w - ] + 至少有一个单词字符（字母，数字，下划线），包括 - （短划线字符）。您使用 ^ 和 $ 来锚定选中文本的开头和结尾。

Where [\w-]+ is at least one any word character (letter, number, underscore) including - (dash character). You use ^ and $ to anchor beginning and end of checked text.

UrlRewriteFilter 文档说

执行规则时，过滤器将（非常简化）遍历所有
规则和每个做类似这样的伪代码：

When executing a rule the filter will (very simplified) loop over all rules and for each do something like this psuedo code:

Pattern.compile(<from> element); pattern.matcher(request url);
matcher.replaceAll(<to> element); 
if ( <condition> elements match && matcher.find() ) {
    handle <set> elements (if any)
    execute <run> elements (if any)
    perform <to> element (if any) 
}

这就是你必须使用开头的原因（ ^ ）和结束（ $ ）字符串正则表达式锚点

That's why you have to use beginning (^) and end ($) string regular expression anchors

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