Java获取web绝对路径的问题

ServletActionContext.getServletContext().getRealPath("")

D:\Java\Tomcat\apache-tomcat-6.0.33\webapps\weibo

ServletActionContext
							.getServletContext().getRealPath("")
							+ "/WEB-INF/classes/weibo_url.txt"

"D:\Java\Tomcat\apache-tomcat-6.0.33\webapps\weibo\WEB-INF\classes\weibo_url.txt"

new File("").getAbsolutePath()

D:\Java\Tomcat\apache-tomcat-6.0.33\bin

new File("/").getAbsolutePath()

D:\