eventhandlerbase.java

MVC结构开发简单例子 非常实用的..有学习MVC的可以看看.

package com.mvc.event.baseEvent;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public abstract class EventHandlerBase {
  protected abstract String getURL();

  public void process( HttpServletRequest request, HttpServletResponse response )
    throws IOException,
           ServletException{
  }

  public void forward( HttpServletRequest request, HttpServletResponse response )
    throws IOException,
           ServletException{
    try{
      _dispatch( request, response );
    }catch( IOException i ){
      throw i;
    }catch( ServletException s ){
      throw s;
    }
  }

  protected void _dispatch( HttpServletRequest request, HttpServletResponse response )
    throws IOException,
           ServletException{
    RequestDispatcher rd = request.getRequestDispatcher( getURL() );

    if( rd == null ){
      throw new ServletException("resource RequestDispatcher apply failed");
    }

    rd.forward( request, response );
  }
}