/**/ /*  错误：  */
String realPath  =   " http:// "   +  request.getServerName()  +   " : "   +  request.getServerPort()  +  request.getContextPath();
String realPath  =   " http:// "   +  request.getServerName()  +   " : "   +  request.getServerPort()  +  request.getServletPath();
/**/ /*  正确：  */
String realPath  =   " http:// "   +  request.getServerName()  +   " : "   +  request.getServerPort()  +  request.getContextPath() + request.getServletPath().substring( 0 ,request.getServletPath().lastIndexOf( " / " ) + 1 );