Spring boot 自定义过滤器Filter

在web开发中，我们经常用到过滤器Filter，用来对所有web资源：例如Jsp, Servlet, 静态图片文件或静态 html 文件等进行拦截，从而实现一些特殊的功能。这篇文章，我们简要演示一下spring boot自定义Filter
一、自定义过滤器
首先，我们自己写一个过滤器类实现Filter接口
MyFilter.java

package com.example.demo.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * Created by yuxl on 2019/1/24.
 * 自定义过滤器，打印出请求的url
 */
public class MyFilter implements Filter {
   @Override
   public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
      HttpServletRequest request = (HttpServletRequest) servletRequest;
      System.out.println(request.getRequestURL());
      filterChain.doFilter(servletRequest,servletResponse);
   }
}

二、编写配置类，装配过滤器
MyConfiguration.java

package com.example.demo.configruation;

import com.example.demo.filter.MyFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Created by yuxl on 2019/1/24.
 * 配置类 装配过滤器
 */
@Configuration
public class MyConfiguration {
   @Bean
   public FilterRegistrationBean setFilterRegistration(){
      FilterRegistrationBean registration = new FilterRegistrationBean();
      registration.setFilter(new MyFilter());
      registration.addUrlPatterns("/*");
      registration.addInitParameter("paramName", "paramValue");
      registration.setName("MyFilter");
      registration.setOrder(1);
      return registration;
   }
}

三、运行调试
启动项目，浏览器输入访问url，后台拦截器打印出请求url

感谢大家百忙之中抽出宝贵的时间阅读本文，欢迎大家批评指正。微信扫下面二维码添加公众号议码评川，可获取java web、大数据、人工智能等相关学习资料。