使用过滤器预加载数据

核心用法

引入其它页面

<jsp:include page="head.jsp"></jsp:include>

过滤器处理数据

package filter;

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


@WebFilter(value = "/head.jsp", dispatcherTypes = DispatcherType.INCLUDE)
public class AFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("in2");
        servletRequest.setAttribute("db", "jsp-include");
        filterChain.doFilter(servletRequest, servletResponse);
        System.out.println("out2");
    }

    @Override
    public void destroy() {

    }
}