SpringBoot自定义Filter

自定义Filter需要两个步骤：

1. 实现Filter【javax.servlet.Filter】接口，实现Filter方法
2. 添加 @Configuration 注解，将自定义Filter加入过滤链

package xatu.zsl.Filter;

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;

import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.IOException;

/** * Created by zsl on 2017/9/3. */@Configurationpublic class ConfigurationFilter {    @Bean    public RemoteIpFilter remoteIpFilter() {        return new RemoteIpFilter();    }

@Bean    public FilterRegistrationBean testFilterRegistration() {        FilterRegistrationBean registration = new FilterRegistrationBean();        registration.setFilter(new MyFilter());//添加过滤器        registration.addUrlPatterns("/*");//设置过滤路径，/*所有路径        registration.addInitParameter("name", "alue");//添加默认参数        registration.setName("MyFilter");//设置优先级        registration.setOrder(1);//设置优先级        return registration;    }

public class MyFilter implements Filter {        @Override        public void destroy() {        }

@Override        public void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain                filterChain)

throws IOException, ServletException {            HttpServletRequest request = (HttpServletRequest) srequest;            //打印请求Url            System.out.println("this is MyFilter,url :" + request.getRequestURI());            filterChain.doFilter(srequest, sresponse);        }

@Override        public void init(FilterConfig arg0) throws ServletException {        }    }}

在Controller中加入如下代码就能获取（刚才【testFilterRegistration()】方法加了注解@Bean，所以Spring容器中会有一个实例， @Autowired就理所应当的注入进来了。）

    @Autowired    FilterRegistrationBean registration;

@GetMapping("/getname")    public Map<String, String> getName() {        Map<String, String> initParameters = registration.getInitParameters();        return initParameters;    }

原文地址：https://www.cnblogs.com/jpfss/p/9070834.html