Spring Boot 之自定义Filter

Filter即过滤器，可以用来记录请求的日志，校验登录权限等功能。 Spring Boot 自动添加了 OrderedCharacterEncodingFilter 和 HiddenHttpMethodFilter，我们也可以自定义 Filter。
自定义Filter步骤

1.自定义Filter类,实现javax.servlet.Filter接口;
2.将自定义的Filter加入过滤链

自定义Filter

public class MyFilter implements Filter{
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        System.out.println("*** MyFilter url :" + request.getRequestURI()+"***");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }

将自定义Filter加入过滤链

import org.apache.catalina.filters.RemoteIpFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author : Aslan
 * @version : v1.0
 * @time : 2018-06-25 13:54
 * @desc : 用于配置filter
 */
@Configuration
public class WebConfiguration {
    @Bean
    public RemoteIpFilter remoteIpFilter() {
        return new RemoteIpFilter();
    }
    @Bean
    public FilterRegistrationBean testFilterRegistration() {

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());
        //设置过滤路径
        registration.addUrlPatterns("/*");
        //添加默认参数
        registration.addInitParameter("name", "hand");
        //过滤器名字
        registration.setName("MyFilter");
        //设置优先级
        registration.setOrder(1);
        return registration;
    }
}

设置完成以后，启动项目，访问任意url都会被拦截，并打印，如下：