SpringBoot自動添加了OrderedCharacterEncodingFilter和HiddenHttpMethodFilter，當然我們可以自定
義Filter。

自定義Filter需要兩個步驟：

1. 實現Filter【javax.servlet.Filter】介面，實現Filter方法
2. 新增 @Configuration 註解，將自定義Filter加入過濾鏈

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.
 */
 

@Configuration
public class ConfigurationFilter {
    @Bean
    public RemoteIpFilter remoteIpFilter() {
        return new RemoteIpFilter();
    }

    @Bean
    public FilterRegistrationBean testFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new
 
 MyFilter());//新增過濾器
        registration.addUrlPatterns("/*");//設定過濾路徑，/*所有路徑
        registration.addInitParameter("name", "alue");//新增預設引數
        registration.setName("MyFilter");//設定優先順序
        registration.setOrder(1);//設定優先順序
        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;
            //列印請求Url
            System.out.println("this is MyFilter,url :" + request.getRequestURI());
            filterChain.doFilter(srequest, sresponse);
        }

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

在Controller中獲取剛才ConfigurationFilter中【registration.addInitParameter(“name”, “alue”);//新增預設引數】這個設定的引數。

在Controller中加入如下程式碼就能獲取（剛才【testFilterRegistration()】方法加了註解@Bean，所以Spring容器中會有一個例項， @Autowired就理所應當的注入進來了。）

    @Autowired
    FilterRegistrationBean registration;

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