Use steps:
1. Establish the Filter class. Achieve Filter interface
@WebFilter(filterName = "test", urlPatterns = "/success/*")
public class UrlFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("----------------------->过滤器被创建");
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) servletRequest;
String requestURI = req.getRequestURI();
System.out.println("--------------------->过滤器:请求地址"+requestURI);
if(!requestURI.contains("info")){
servletRequest.getRequestDispatcher("/failed").forward(servletRequest, servletResponse);
}else{
filterChain.doFilter(servletRequest, servletResponse);
}
}
@Override
public void destroy() {
System.out.println("----------------------->过滤器被销毁");
}
}
2. Filter annotated.
3. Based on the main scanning plus package.