JavaWeb common error: javawebfilter

JavaWeb common error: javawebfilter

1. <a href = "customerServlet? Method = add "> Add </a> here method = add cannot have spaces; otherwise, an error is returned (NULL pointer exception)

1 <% @ page language = "java" contentType = "text/html; charset = ISO-8859-1" 2 pageEncoding = "ISO-8859-1" %> 3 <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" http://www.w3.org/TR/html4/loose.dtd "> 4 2. "/" should not be added before Servlet creation in url-pattern. Otherwise, an error will be reported.