package com.xz.springsecuritydemo.filter;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import java.io.IOException;
import java.util.Date;
@Component//添加該注解使過濾器啟作用，如果不使用@Component注解需要寫配置類，例lz寫的WebConfig進行注冊
public class TimeFilter implements Filter {
    //在控制器方法（即controller類中的方法）調用之前調用
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("Time Filter init");
    }
    //在控制器方法（即controller類中的方法）調用之后調用
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("Time Filter start");
        long startTime = new Date().getTime();
        chain.doFilter(request,response);
        long endTime = new Date().getTime();
        System.out.println("Filter耗時："+(endTime-startTime));
        System.out.println("Time Filter end");
    }
    //在控制器方法（即controller類中的方法）調用之后調用
    @Override
    public void destroy() {
        System.out.println("Time Filter destroy");
    }
}

package com.xz.springsecuritydemo.filter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.ArrayList;
@Configuration
public class WebFilterConfig {
    @Bean
    public FilterRegistrationBean timeFilter(){
        FilterRegistrationBean filterRegistrationBean=new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new TimeFilter());
        ArrayList<String> list = new ArrayList<>();
        list.add("/*");//過濾所有路徑
        filterRegistrationBean.setUrlPatterns(list);
        return filterRegistrationBean;
    }
}

@RestController//表示此Controller提供RestAPI
public class SysQueryController {
   /**
     * @RequestMapping  映射http請求url到java方法
     * @RequestParam    映射請求參數(shù)到java方法的參數(shù)
     */
    @RequestMapping(value = "/user1",method = RequestMethod.GET)
    public void query1(@RequestParam String username){
        System.out.println("query1====="+username);
    }
 }

//輸出內容
Time Filter start
query1=====xz
Filter耗時：128
Time Filter end