helper.java

这是我自己开发的一个MVC框架

package dark.web.frame;

import java.io.InputStream;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * <p>Title:            </p>
 * <p>Description:      </p>
 * <p>Copyright:        Copyright (c) 2004</p>
 * <p>Company:          DIS</p>
 * <p>Create Time:      2005-3-4 2:06:32</p>
 * @author             <a href="mailto:[e-mail]">darkhe</a>
 * @version            1.0
 */
public class Helper
{
	public static void saveMessage(Message m, HttpSession session)
	{
		session.setAttribute(Definition.MESSAGE_KEY, m);
	}

	public static void saveValue(Value v, HttpSession session)
	{
		session.setAttribute(Definition.VALUE_KEY, v);
	}

	public static void saveMessage(Message m, HttpServletRequest request)
	{
		request.setAttribute(Definition.MESSAGE_KEY, m);
	}

	public static void saveValue(Value v, HttpServletRequest request)
	{
		request.setAttribute(Definition.VALUE_KEY, v);
	}

	public static Message loadMessage(HttpServletRequest request)
	{
		Message message =
			(Message) request.getAttribute(Definition.MESSAGE_KEY);

		if (message != null)
		{
			return message;
		}
		else
		{
			return new Message();
		}
	}

	public static Message loadMessage(HttpSession session)
	{
		Message message =
			(Message) session.getAttribute(Definition.MESSAGE_KEY);

		if (message != null)
		{
			return message;
		}
		else
		{
			return new Message();
		}
	}

	public static Value loadValue(HttpServletRequest request)
	{
		Value v = (Value) request.getAttribute(Definition.VALUE_KEY);

		if (v != null)
		{
			return v;
		}
		else
		{
			return new Value();
		}
	}

	public static Value loadValue(HttpSession session)
	{
		Value v = (Value) session.getAttribute(Definition.VALUE_KEY);

		if (v != null)
		{
			return v;
		}
		else
		{
			return new Value();
		}
	}

	public static String getRealPath(
		ServletContext servletContext,
		String file)
	{
		// little fix up
		if (!file.startsWith("/"))
		{
			file = "/" + file;
		}

		// get config file pathname
		String pathname = servletContext.getRealPath(file);

		return pathname;
	}

	public static InputStream getInputStream(
		ServletContext servletContext,
		String path)
	{
		InputStream is = servletContext.getResourceAsStream(path);
		return is;
	}
}