Spring Boot之FilterRegistrationBean-自定义Filter详解

package com.zoo.lion.modules.test.test; 
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;
 
/**
 * @Author: xf
 * @Date: 2019/7/16 13:39
 * @Version 1.0
 */
@Configuration
public class WebConfiguration {
 
    @Bean
    public RemoteIpFilter remoteIpFilter() {
        return new RemoteIpFilter();
    }
 
    @Bean
    public FilterRegistrationBean<MyFilter> testFilterRegistration() {
        FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>();
        registration.setFilter(new MyFilter());
        //过滤应用程序中所有资源,当前应用程序根下的所有文件包括多级子目录下的所有文件，注意这里*前有“/”
        registration.addUrlPatterns("/*");
        //过滤指定的类型文件资源, 当前应用程序根目录下的所有html文件，注意：*.html前没有“/”,否则错误
        registration.addUrlPatterns(".html");
        //过滤指定的目录下的所有文件,当前应用程序根目录下的folder_name子目录（可以是多级子目录）下所有文件
        registration.addUrlPatterns("/folder_name/*");
        //过滤指定文件
        registration.addUrlPatterns("/index.html");
 
        registration.addInitParameter("paramName", "paramValue");
        registration.setName("MyFilter");
        registration.setOrder(1);
        return registration;
    } 
 
    public class MyFilter implements Filter { 
        @Override
        public void init(FilterConfig filterConfig) {
 
        }
 
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
            HttpServletRequest request2 = (HttpServletRequest) request;
            System.out.println(request2.getRequestURI());
            chain.doFilter(request, response);
        }
 
        @Override
        public void destroy() { 
        }
    }
}

package com.dbzhang;
/**
 * @author zdb
 * @description @Configuration和@Bean注解配置使用，就相当于在配置文件中配置bean的注解式用法
 */
import java.io.IOException;
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.http.HttpServletRequest;
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;
 
@Configuration
public class WebConfiguration {
	@Bean
	public RemoteIpFilter remoteIpFilter(){
		return new RemoteIpFilter();
	}
	/***
	 * 这个FilterRegistrationBean类可以使用setOrder()方法实现对filter的排序，然后在进行注册
	 * https://blog.csdn.net/doctor_who2004/article/details/56055505
	 */
	public FilterRegistrationBean testFilterRegistration(){
		FilterRegistrationBean registration = new FilterRegistrationBean();
		registration.setFilter(new MyFilter());
		registration.addUrlPatterns("/*");
		registration.addInitParameter("paramName", "paramValue");
		registration.setName("MyFilter");
		registration.setOrder(1);
		return registration;
	}
	/**
	 * 
	 * @author zdb
	 * @description 这个是用来实现Filter
	 *
	 */
	public class MyFilter implements Filter{ 
		@Override
		public void destroy() {			
		}
 
		@Override
		public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
				throws IOException, ServletException {
			HttpServletRequest request = (HttpServletRequest)servletRequest;
			System.out.println("this is MyFilter,url:"+request.getRequestURI());
			filterChain.doFilter(servletRequest, servletResponse);
		}
 
		@Override
		public void init(FilterConfig arg0) throws ServletException {			
		}		
	}
}