struts global-exception-mappings解析

最新推荐文章于 2021-09-15 13:36:14 发布

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本文详细介绍了如何在Struts框架中使用全局异常映射捕获特定异常并重定向到错误页面，同时定义全局结果用于渲染错误页面。

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struts global-exception-mappings

1. In struts.xml, use global-exception-mappings to define mappings that
catch-all exceptions of interest.

<global-exception-mappings>
<exception-mapping exception="java.lang.NoSuchMethodException"
result="methodNotSupported"/>
<exception-mapping exception="java.lang.IllegalArgumentException"
result="methodNotSupported"/>
<exception-mapping exception="java.lang.Throwable" result="error"/>
</global-exception-mappings>

2. In struts.xml, define global-results that are referenced by the
global-exception-mappings. These are standard struts2 results that can
render your error page.
Here's an example:

<global-results>
<result name="methodNotSupported" type="httpheader">
<param name="error">405</param>
<param name="errorMessage">The requested method is
unsupported</param>
</result>
<result name="error" type="redirect">/error.jsp</result>
</global-results>

3. The interceptor cannot catch exceptions that occur outside the action
invocation. As you've already discovered, you have to use the
container's error handling for these.
If you're using Apache in front of tomcat you'll also need to repeat the
information a third time there (eg. error page if tomcat is down).