struts中利用ExceptionHandler处理异常-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_16130/article/details/82448324

本文介绍了一个用于Struts框架的自定义异常处理器SystemExceptionHandler，该处理器能够处理特定类型的异常，并根据异常类型显示不同的错误信息。文章还展示了如何在struts-config.xml中配置全局异常处理器。

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package com.ex;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.Globals;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ExceptionHandler;
import org.apache.struts.config.ExceptionConfig;

import com.ex.SystemException;

public class SystemExceptionHandler extends ExceptionHandler {

@Override
public ActionForward execute(Exception ex, ExceptionConfig ae,
    ActionMapping mapping, ActionForm formInstance,
    HttpServletRequest request, HttpServletResponse response)
    throws ServletException {

        ActionForward forward = null;
        ActionMessage error = null;
        String property = null;
        if (ae.getPath() != null) {//配置文件中的path
            forward = new ActionForward(ae.getPath());
        } else {
            forward = mapping.getInputForward();//如果没有找到path，转到input配置的路径
        }

        this.logException(ex);

  //处理自定义的异常类SystemException
   if(ex instanceof SystemException){
    SystemException se = (SystemException)ex;
   //如果只有message，而没有key
    if(se.getKey() == null){
     error = new ActionMessage(ae.getKey(), ex.getMessage());
     property = ae.getKey();
    }else{ //SystemException中有key值
     error = new ActionMessage(se.getKey(),se.getValues());
     property = se.getKey();
    }
         request.setAttribute(Globals.EXCEPTION_KEY, ex);
         this.storeException(request, property, error, forward, ae.getScope());

         return forward;
   }

   return super.execute(ex, ae, mapping, formInstance, request, response);
}

}
struts-config.xml中配置：

    <global-exceptions>
   <exception
    type="java.lang.Exception"
    handler="com.ex.SystemExceptionHandler"
    path="/pub_exception.jsp"
    scope="request"
   >
   </exception>
</global-exceptions>