package com.example.demo.filter1;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.stereotype.Component;

/**
 * Springboot實(shí)現(xiàn)filter的方式一：
 * 實(shí)現(xiàn)Filter接口，并使用@Component注解
 * 需要注意的是：這個(gè)方式注冊(cè)的filter的執(zhí)行順序優(yōu)先級(jí)較低
 * @author Administrator
 *
 */
@Component
public class FilterSample1 implements Filter {

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
    System.out.println("這里是"+this.getClass().getName()+"的init");
    
  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      throws IOException, ServletException {
    System.out.println("這里是"+this.getClass().getName()+"的doFilter");
    chain.doFilter(request,response);
  }

  @Override
  public void destroy() {
    System.out.println("這里是"+this.getClass().getName()+"的doFilter");
    
  }
}

package com.example.demo.filter2;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class FilterSample2 implements Filter{

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
      throws IOException, ServletException {
    System.out.println("這里是"+this.getClass().getName()+"的doFilter");
    chain.doFilter(request,response);
    
  }
}

package com.example.demo.filter2;

import java.util.ArrayList;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Springboot注冊(cè)filter方法二：
 * 同樣要實(shí)現(xiàn)filter接口，但filter注冊(cè)使用@Bean的方式進(jìn)行注冊(cè)，可以設(shè)置filter順序
 * @author Administrator
 *
 */
@Configuration
public class WebConfig {
  @Bean
  public FilterRegistrationBean<FilterSample2> filterSample2() {
    FilterRegistrationBean<FilterSample2> registrationBean = new FilterRegistrationBean<FilterSample2>();
    FilterSample2 myFilter = new FilterSample2();
    registrationBean.setFilter(myFilter);
    ArrayList<String> urls = new ArrayList<>();
    urls.add("/*");//配置過(guò)濾規(guī)則
    registrationBean.setUrlPatterns(urls);
    registrationBean.setOrder(3);
    return registrationBean;
  }
}

#application.yml
debug: true