SpringBoot使用Filter过滤器注解配置方法

2023-01-14 20:57:47 by 极墨笔记 in SpringBoot

创建filter目录放置过滤器类，在该目录下创建一个TestFilter过滤器

package com.zeromemos.filter;

import com.google.common.collect.Lists;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.IOException;
import java.util.List;

@Order(1) //数值越低优先级越高
@Component
@WebFilter(filterName = "testFilter" , urlPatterns = "/*") //对所有链接/*进行过滤
public class TestFilter implements Filter {

    //过滤白名单
    public static List<String> WHITE_PATH = Lists.newArrayList("/index","/favicon.ico");

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("过滤器初始化");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("进入过滤器");
        //获取请求链接
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        String requestURI = request.getRequestURI();
        System.out.println("当前请求路径是 " + requestURI);

        //如果是白名单里的链接，直接进入到下一个过滤器处理
        if (WHITE_PATH.contains(requestURI)){
            System.out.println("判断是白名单里的方法");
            filterChain.doFilter(servletRequest, servletResponse);
            return;
        }

        //这里执行拦截的方法，比如跳转到指定的页面
        System.out.println("判断不是白名单里的方法");
        System.out.println("跳转到指定页面/index");
        HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper((HttpServletResponse)servletResponse);
        wrapper.sendRedirect("/index");
    }

    //过滤器销毁方法
    @Override
    public void destroy() {

    }
}

过滤器init()方法在项目启动时执行

请求http://localhost:9001/article/getAll路径测试，会被过滤跳转到http://localhost:9001/index