Filter在springboot中的使用方法详解

public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 对request或 response 进行处理
        // 调用filter链中的下一个filter
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

public class MyFilter extends OncePerRequestFilter {
    /**此处不能@override doFilter方法
     *  因为OncePerRequestFilter中 doFilter方法已经是final
     *
     */
    //自定义处理方法
    public void interrupt(HttpServletResponse response, ErrorCode code){
        //此处对response进行处理
    }
    //重载OnecePerRequestFilter方法
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain){
    //调用自定义处理方法
    interrupt(response,code);
    //对request 、response进行处理
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
@Configuration
public class MyFilterConfig {
   @Bean
    public FilterRegistrationBean myFilterBean(MyFilter filter) {
        FilterRegistrationBean<Filter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(filter);//设置为自定义的过滤器MyFilter
        filterRegistrationBean.addUrlPatterns("/*");//拦截所有请求
        filterRegistrationBean.setOrder(1);//优先级为1
        return filterRegistrationBean;
    }
    //可注册多个自定义的过滤器
}

<filter>
    <filter-name>myFilter</filter-name>
    <filter-class>com.text.filter.myFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>myFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>