baseaction.java

一个用JSP写的网络购物系统

package cn.edu.dlnu.frame.actions;

import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.ResourceBundle;

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 BaseAction {
 protected String url="";
  public static HashMap<String, String> urls=new HashMap<String, String>();
	 static {
		ResourceBundle bundle = ResourceBundle.getBundle("urls");
		Enumeration<String> e = bundle.getKeys();
	      while (e.hasMoreElements()) {
	        String key = (String) e.nextElement();
	        String value = bundle.getString(key);
	        urls.put(key, value);
	        }
	}
	  protected abstract String getURL();
	    
	    public abstract void process (ServletContext sc, 
	            HttpServletRequest request, HttpServletResponse response)
	    	throws IOException, ServletException;

	    public void forward (HttpServletRequest request, HttpServletResponse response) 
	      throws IOException, ServletException {
	      _dispatch (request, response);
	    }

	    private void _dispatch (HttpServletRequest request, HttpServletResponse response) 
	      throws IOException, ServletException {
	    	String context=request.getContextPath();
	    	System.out.println(context);
            RequestDispatcher rd  = request.getRequestDispatcher(getURL());
	      if (rd == null) {
	        System.err.print(this+"forward Error");
	      }
	      rd.forward (request, response);
	    }
}