springboot,实现简单的filter过滤器

短命女 2022-05-10 01:42 211阅读 0赞

# 目的：springboot,实现简单的filter过滤器 #

环境搭建 ： [https://blog.csdn.net/wuyinlei/article/details/79227962][https_blog.csdn.net_wuyinlei_article_details_79227962]

项目整体目录结构：

![70][]

###  filter 方法 ###

package com.xdx97.backstage.filter;
    
    //判断是否登陆的 filter
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import java.io.IOException;
    
    // /* 表示全部拦截
    @WebFilter(filterName = "loginFilter",urlPatterns = "/*")
    public class LoginFilter implements Filter {
        //初始化调用的方法
        //当服务器 被启动的时候，调用
        public void init(FilterConfig filterConfig) throws ServletException {
            System.out.println("哎呀，我被生出来了！！！");
        }
    
        //拦截的方法
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            System.out.println("哈哈 被拦截了吧！！！");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        //销毁时候调用的方法
        public void destroy() {
            System.out.println("哎呀，我要被销毁了！！！");
    
        }
    }

### controller 方法 ###

package com.xdx97.backstage.controller;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class BlogController {
        @RequestMapping("/aaa")
        public String aaa() {
    
            return "aaa";
        }
    
    }

启动方法 App.java

![70 1][]

package com.xdx97.backstage;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    
    @SpringBootApplication
    @MapperScan(basePackages = { "com.xdx97.backstage.dao" })
    @ServletComponentScan(basePackages = {"com.xdx97.backstage.filter"})
    public class App {
    
        public static void main(String[] args) {
            SpringApplication.run(App.class, args);
        }
    }

如果还想要，排除某个 url

[https://blog.csdn.net/amanicspater/article/details/74267444][https_blog.csdn.net_amanicspater_article_details_74267444]

[https_blog.csdn.net_wuyinlei_article_details_79227962]: https://blog.csdn.net/wuyinlei/article/details/79227962
[70]: /images/20220510/e329fc042f1442eb85963d5f9d4dcd86.png
[70 1]: /images/20220510/0a76d237af764305b22d0b30c974913a.png
[https_blog.csdn.net_amanicspater_article_details_74267444]: https://blog.csdn.net/amanicspater/article/details/74267444