java - 使用 SSH2 和 URLrewrite 并出现 stackoverflow 错误

Question

我使用的是 urlrewritefilter 4.0.3，我总是遇到 stackoverflow 错误。这是我的配置:

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext*.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
    <init-param>
        <param-name>statusEnabled</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/annotation/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
</filter-mapping>


<filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
</filter-mapping>

这是我的网址重写模式:

<rule>
    <note>
        Redirect find annotation by object id.
    </note>
    <from>/annotation/([a-z0-9]+)</from>
    <to type="forward">/annotation/getAnnotationByObjectID.action?oid=$1</to>
</rule>

一旦我运行它，我总是得到:

javax.servlet.ServletException: Filter execution threw an exception
org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
    org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
    org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
...
root cause

java.lang.StackOverflowError
    javax.servlet.ServletRequestWrapper.isAsyncStarted(ServletRequestWrapper.java:403)
    javax.servlet.ServletRequestWrapper.isAsyncStarted(ServletRequestWrapper.java:403)
    javax.servlet.ServletRequestWrapper.isAsyncStarted(ServletRequestWrapper.java:403)
    javax.servlet.ServletRequestWrapper.isAsyncStarted(ServletRequestWrapper.java:403)

我对此很生气。如果您知道是怎么回事，请帮助我。多谢。

Answer 1

<from> 中的正则表达式规则没有锚定。显然，规则正在寻找 URL 内的任何匹配项，因此如果它们未锚定(开头有 ^，结尾有 $)，它们将匹配 URL 内的任何内容。

因此，您的目标网址 /annotation/getAnnotationByObjectID.action?oid=$1实际上与您的 from 匹配规则(/annotation/get 部分执行)。因此它会在无限循环中一遍又一遍地运行相同的规则。

解决方案应该是锚定规则:

<from>^/annotation/([a-z0-9]+)$</from>