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二话不说，直接上代码

package cn.sigangjun.util;/** * 
Title: Get Path Util 
 * 
Description: this class can getWebClassesPath,getWebInfPath and getWebRoot
 * @since 2013-8-12 下午4:09:00  * @version 1.0 * @author sigangjun */public class PathUtil {	public String getWebClassesPath() {		String path = getClass().getProtectionDomain().getCodeSource()				.getLocation().getPath();		path = trim(path);		return path;	}	public String getWebInfPath() throws IllegalAccessException {		String path = getWebClassesPath();		if (path.indexOf("WEB-INF") > 0) {			path = path.substring(0, path.indexOf("WEB-INF") + 8);			path = trim(path);		} else {			throw new IllegalAccessException("路径获取错误");		}		return path;	}	public String getWebRoot() throws IllegalAccessException {		String path = getWebClassesPath();		if (path.indexOf("WEB-INF") > 0) {			path = path.substring(0, path.indexOf("WEB-INF/classes"));			path = trim(path);		} else {			throw new IllegalAccessException("路径获取错误");		}		return path;	}		private String trim(String s){		if(s.startsWith("/")||s.startsWith("\\")){			s = s.substring(1);			trim(s);		}		return s;	};		public static void main(String[] args) throws Exception {		PathUtil p = new PathUtil();		System.out.println(p.getWebClassesPath());		System.out.println(p.getWebInfPath());		System.out.println(p.getWebRoot());	}	}