spring boot 配置Filter過濾器的兩種方式

springboot 配置 自定的 過濾器需要將自定義的過濾配實現 javax.servlet.Filter接口

 demo1：在自定義過濾器上添加組件注解

package com.dayu.filter;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import java.io.IOException;
import java.util.Date;

/**
 * @author 大宇
 * Description 過濾器處理所有請求
 * 這里寫兩種配置方式：一種在myFilter類上加上@Component注解，
 * 另一種不添加這個注解，在config包下創建一個配置類config.WebConfig，通過配置Bean
 */
@Component
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("MyFilter.init");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("time filter start");
        long start = new Date().getTime();
        filterChain.doFilter(request,response);
        System.out.println(new Date().getTime()-start);
        System.out.println("time filter end");
    }

    @Override
    public void destroy() {
        System.out.println("MyFilter.destroy");
    }
}

 

第二種就是講上面的注解去掉，在自定義config中用配置Bean的方式裝配

package com.dayu.config;

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

import java.util.ArrayList;

/**
 * @author 大宇
　Configuration注解配置很重要
 */
@Configuration
public class WebConfig  {
    @Bean
    public FilterRegistrationBean timeFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        MyFilter myFilter = new MyFilter();
        registrationBean.setFilter(myFilter);
        ArrayList<String> urls = new ArrayList<>();
        urls.add("/*");//配置過濾規則
        registrationBean.setUrlPatterns(urls);
        return registrationBean;
    }
}