方法一

1.新建一個TimeFilter類，

public class TimeFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("TimeFilter init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("TimeFilter start");

        filterChain.doFilter(servletRequest,servletResponse);

        System.out.println("TimeFilter finish");
    }

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

2.新建一個配置類，將TimeFilter注入

@Configuration
public class WebConfig{
    @Bean
    public FilterRegistrationBean timeFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        TimeFilter timeFilter = new TimeFilter();
        filterRegistrationBean.setFilter(timeFilter);
        List<String> urls = new ArrayList<>();
        urls.add("/users/*");
        filterRegistrationBean.setUrlPatterns(urls);//配置過濾規則
        return filterRegistrationBean;
    }
}
 

3.啟動專案，在瀏覽器輸入localhost:8080/users/save，在控制檯可看到如下輸出

TimeFilter start
TimeFilter finish

方法二

1.新建一個TimeFilter類，

@Order(1)
@WebFilter(urlPatterns = "/users/*",filterName = "TimeFilter")
public class TimeFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("TimeFilter init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("TimeFilter start");

        filterChain.doFilter(servletRequest,servletResponse);

        System.out.println("TimeFilter finish");
    }

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

@SpringBootApplication
@ServletComponentScan
public class SpringbootLearningApplication {
	public static void main(String[] args) {
		SpringApplication.run(SpringbootLearningApplication.class, args);
	}
}