java类获取web应用的根目录（转载）

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package cn.gyd.util.test;

/**
*

* java类获取web应用的根目录
*

*/
public class PathUtil {

/**
   * @param args
   */
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());
}

public String getWebClassesPath() {
   String path = getClass().getProtectionDomain().getCodeSource()
     .getLocation().getPath();
   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);
   } 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"));
   } else {
    throw new IllegalAccessException("路径获取错误");
   }
   return path;
}
}

或者使用 <%
String path = request.getContextPath();
out.println(path);
%>