下面显示的是结果，我用的是idea,和老师讲的一样的代码，但是输出却是重复的?why？
FirstFilter Filter{
destroy() {
System..println();
}
doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) IOException, ServletException
{
System..println();
filterChain.doFilter(servletRequest,servletResponse);
System..println();
}
init(FilterConfig filterConfig) ServletException {System..println();
}
}这是FirstFilter
SecondFilter Filter {
destroy() {
System..println();
}
doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) IOException, ServletException {
System..println();
filterChain.doFilter(servletRequest,servletResponse);
System..println();
}
init(FilterConfig filterConfig) ServletException {
System..println();
}
}
