Struts异常处理机制-优快云博客

struts-config.xml


<global-exceptions>
 <exception key="" type="com.hugui.struts.ErrorCodeException" path="/error.jsp" handler="com.hugui.struts.ErrorCodeExceptionHandler"></exception>
	</global-exceptions>

覆盖ExceptionHandler


package com.hugui.struts;

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 org.apache.struts.util.ModuleException;

/**
 * 个性化异常处理类
 * @author Administrator
 *
 */
public class ErrorCodeExceptionHandler extends ExceptionHandler {

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

		 		if(!(ex instanceof ErrorCodeException)){
		 			return super.execute(ex, ae, mapping, formInstance, request, response);
		 		}

		        ActionForward forward = null;
		        ActionMessage error = null;
		        String property = null;



		        // Build the forward from the exception mapping if it exists
		        // or from the form input
		        if (ae.getPath() != null) {
		            forward = new ActionForward(ae.getPath());
		        } else {
		            forward = mapping.getInputForward();
		        }

		        // Figure out the error
		        if (ex instanceof ModuleException) {
		            error = ((ModuleException) ex).getActionMessage();
		            property = ((ModuleException) ex).getProperty();
		        } else {
//		            error = new ActionMessage(ae.getKey(), ex.getMessage());
		        	ErrorCodeException ece = (ErrorCodeException)ex;
		        	 error = new ActionMessage(ece.getErrorCode(), ece.getArgs());		            property = error.getKey();
		        }

		        this.logException(ex);

		        // Store the exception
		        request.setAttribute(Globals.EXCEPTION_KEY, ex);
		        this.storeException(request, property, error, forward, ae.getScope());

		        return forward;

		    }

}


package com.hugui.struts;

public class AppException extends RuntimeException {

	public AppException() {
		// TODO Auto-generated constructor stub
	}

	public AppException(String message) {
		super(message);
		// TODO Auto-generated constructor stub
	}

	public AppException(Throwable cause) {
		super(cause);
		// TODO Auto-generated constructor stub
	}

	public AppException(String message, Throwable cause) {
		super(message, cause);
		// TODO Auto-generated constructor stub
	}

}


package com.hugui.struts;

public class UserManager {

	public void login(String username, String password){
		if(!"admin".equals(username)){
			throw new ErrorCodeException("login.user.not.found",username);
		}

		if(!"admin".equals(password)){
			throw new ErrorCodeException("login.password.error");
		}
	}

}


<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>

<%@ taglib  uri="http://struts.apache.org/tags-html" prefix="html" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
	<html:errors/>
</body>
</html>