自定义NutFilter

这一小节,我们需要继承一下NutFilter,加点小判断

新建一个类, 叫NutzBookNutFilter,包名是net.wendal.nutzbook.mvc,超类是org.nutz.mvc.NutFilter

整个类的代码如下

package net.wendal.nutzbook.mvc;

import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.nutz.mvc.NutFilter;

public class NutzBookNutFilter extends NutFilter {

    protected Set<String> prefixs = new HashSet<String>();


    public void init(FilterConfig conf) throws ServletException {
        super.init(conf);
        prefixs.add(conf.getServletContext().getContextPath() + "/druid/");
        prefixs.add(conf.getServletContext().getContextPath() + "/rs/");
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        if (req instanceof HttpServletRequest) {
            String uri = ((HttpServletRequest) req).getRequestURI();
            for (String prefix : prefixs) {
                if (uri.startsWith(prefix)) {
                    chain.doFilter(req, resp);
                    return;
                }
            }
        }
        super.doFilter(req, resp, chain);
    }
}

含义是, 如果访问/druid或/rs下的路径,就无条件跳过NutFilter

然后,打开web.xml, 将其中的org.nutz.mvc.NutFilter改成net.wendal.nutzbook.mvc.NutzBookNutFilter

    <filter>
        <filter-name>nutz</filter-name>
        <filter-class>net.wendal.nutzbook.mvc.NutzBookNutFilter</filter-class>
        <init-param>
            <param-name>modules</param-name>
            <param-value>net.wendal.nutzbook.MainModule</param-value>
        </init-param>
    </filter>

启动tomcat, 应无异常.