拦截方式配置：资源被访问的方式

1. 注解配置：
   设置dispatcherTypes属性
   1. REQUEST：默认值。浏览器直接请求资源
   2. FORWARD：转发访问资源
   3. INCLUDE：包含访问资源
   4. ERROR：错误跳转资源
   5. ASYNC：异步访问资源
2. web.xml配置
   设置标签即可

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

//拦截方式配置
@WebFilter(value = "/index.jsp", dispatcherTypes = {DispatcherType.REQUEST,DispatcherType.FORWARD})
public class FilterDemo5 implements Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        System.out.println("拦截请求或者转发到index.jsp的资源");
        chain.doFilter(req, resp);
    }

    public void init(FilterConfig config) throws ServletException {

    }

}