webutils.java

《j2ee开发全程实录》随书源码

package com.cownew.PIS.framework.web.helper;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;

public class WebUtils
{
	/**
	 * 从pageContext得到部署路径
	 * @param pageContext
	 * @return
	 */
	public static String getContextPath(PageContext pageContext)
	{
		HttpServletRequest request = (HttpServletRequest) pageContext
				.getRequest();

		return request.getContextPath();
	}

	/**
	 * 得到path的相对于部署路径的绝对路径
	 * @param request
	 * @param response
	 * @param path
	 * @return
	 */
	public static String getAbsoluteURL(HttpServletRequest request,
			HttpServletResponse response, String path)
	{
		String contextPath = request.getContextPath();
		if (!path.startsWith("/"))
		{
			path = "/" + path;
		}
		return response.encodeURL(contextPath + path);
	}

	/**
	 * 得到path的相对于部署路径的绝对路径
	 * @param pageContext
	 * @param path
	 * @return
	 */
	public static String getAbsoluteURL(PageContext pageContext, String path)
	{
		HttpServletRequest request = (HttpServletRequest) pageContext
				.getRequest();
		HttpServletResponse reponse = (HttpServletResponse) pageContext
				.getResponse();
		return getAbsoluteURL(request, reponse, path);
	}
}