两种方法

方法一：

　　正常创建好Filter类，配置完成

package clc.user.filter;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 javax.servlet.annotation.WebFilter;import java.io.IOException;/** * ClassName: FirstFilter
 * Description: 
 * date: 2019/4/1 5:31 PM
 * * @author chengluchao * @since JDK 1.8 */@WebFilter(filterName = "FirstFilter", urlPatterns = {"/FirstFilter", "/FirstServlet"})public class FirstFilter implements Filter {    @Override    public void init(FilterConfig filterConfig) throws ServletException {        System.out.println("init-FirstFilter");    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {        System.out.println("doFilter-FirstFilter");    }    @Override    public void destroy() {        System.out.println("destroy-FirstFilter");    }}

启动类使用注解ServletComponentScan

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

方法二：

写好Filte但不进行配置，在启动类中进行配置

package clc.user.filter;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 javax.servlet.annotation.WebFilter;import java.io.IOException;/** * ClassName: SecondFilter
 * Description: 
 * date: 2019/4/1 5:31 PM
 * * @author chengluchao * @since JDK 1.8 */public class SecondFilter implements Filter {    @Override    public void init(FilterConfig filterConfig) throws ServletException {        System.out.println("init-SecondFilter");    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {        System.out.println("doFilter-SecondFilter");    }    @Override    public void destroy() {        System.out.println("destroy-SecondFilter");    }}

@SpringBootApplicationpublic class UserServiceApplication2 {    @Bean    public ServletRegistrationBean getServletRegistrationBean() {        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());        bean.addUrlMappings("/SecondServlet");        return bean;    }    @Bean    public FilterRegistrationBean getFilterRegistrationBean() {        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());        bean.addUrlPatterns("/SecondServlet","/123");        return bean;    }    public static void main(String[] args) {        SpringApplication.run(UserServiceApplication2.class, args);    }}

 

 

注意，所有的路径必须以"/"开头