Struts 2 - 如何将 Exception 类型的异常重定向到特定页面,但不处理特定异常? [英] Struts 2 - How to redirect exceptions of type Exception to a particular page, but not handle a particular exception?
问题描述
我希望将所有 Exception
类型的错误重定向到结果error".为此,我这样做了:
I wish to redirect all errors of type Exception
to the result "error". For that, I did this :
<global-exception-mappings>
<exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
</global-exception-mappings>
但我不想处理特定的异常,特别是应该允许进一步传播的 org.springframework.security.access.AccessDeniedException
.我怎样才能做到这一点?
But I don't want to handle a particular exception, specifically the org.springframework.security.access.AccessDeniedException
which should be allowed to propagate further. How can I achieve that ?
推荐答案
使用 instanceof
运算符并从异常处理程序中重新抛出所需的异常.
Use instanceof
operator and rethrow desired exception from exception handler.
我用拦截器管理它(这是我曾经尝试过的):
I managed it with an interceptor (here is what I used to try it out):
package com.kenmcwilliams.interceptor;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Rethrower implements Interceptor{
@Override
public void destroy() {
}
@Override
public void init() {
}
@Override
public String intercept(ActionInvocation invocation){
System.out.println("Start rethrower!");
String result = "success";
try {
result = invocation.invoke();
} catch (Exception ex) {
Logger.getLogger(Rethrower.class.getName()).log(Level.SEVERE, null, ex);
}
Object exception = ActionContext.getContext().getValueStack().findValue("exception");
if (exception instanceof RuntimeException){
System.out.println("DOING RETHROW!");
RuntimeException e = (RuntimeException)exception;
throw e;
}
System.out.println("After rethrower!");
return result;
}
}
这里是struts.xml(为了节省查找struts dtd的时间):
Here is the struts.xml (to save time looking up struts dtd):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<constant name="struts.ui.theme" value="simple" />
<package name="kenmcwilliams" namespace="/" extends="struts-default">
<interceptors>
<interceptor name="rethrower" class="com.kenmcwilliams.interceptor.Rethrower"/>
<interceptor-stack name="rethrow-stack">
<interceptor-ref name="rethrower"/>
<interceptor-ref name="defaultStack"/>
</interceptor-stack>
</interceptors>
<global-results>
<result name="error" >/WEB-INF/content/error.jsp</result>
</global-results>
<global-exception-mappings>
<exception-mapping exception="java.lang.Exception" result="error"/>
</global-exception-mappings>
<action name="mybomb" class="com.kenmcwilliams.kensocketchat.action.Bomb">
<interceptor-ref name="rethrow-stack"/>
<result>/WEB-INF/content/bomb.jsp</result>
</action>
</package>
</struts>
最后是动作(它只是抛出一个运行时异常):
Finally the action (it just throws a runtime exception):
package com.kenmcwilliams.kensocketchat.action;
import com.opensymphony.xwork2.ActionSupport;
public class Bomb extends ActionSupport{
@Override
public String execute() throws Exception{
throw new RuntimeException();
}
}
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