在Filter中注入service

     private static ApplicationContext ctx = new ClassPathXmlApplicationContext(
            new String[] {"classpath:/spring/applicationContext.xml"});
    //获取Service
    UserService userService= (UserService) ctx.getBean("userService");

package com.fyz.filter;

import com.fyz.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

@WebFilter(filterName = "fireWallFilter", urlPatterns = "/*")
public class FireWallFilter implements Filter {

    //在Filter中注入service
    private static ApplicationContext ctx = new ClassPathXmlApplicationContext(
            new String[] {"classpath:/spring/applicationContext.xml"});
    //获取Service
    UserService userService= (UserService) ctx.getBean("userService");

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;

        // req.getRequestURI();
        String urlPath = req.getRequestURI();
        Pattern p = Pattern.compile(".jsp");
        Matcher m = p.matcher(urlPath);
        // 判断访问页面是否被禁止
        if (!m.find()) {
            chain.doFilter(request, response);
        } else {

            response.setContentType("text/html;charset=gb2312");
            PrintWriter out = response.getWriter();
            out.println("<script language='javascript' type='text/javascript'>");
            out.println("alert('本系统不允许直接访问jsp文件！');window.history.go(-1);");
            out.println("</script>");
            out.flush();
            out.close();
            return;

        }

    }

    @Override
    public void destroy() {
    }

}