Spring Boot之FilterRegistrationBean-自定义Filter详解

时间:2021-11-15 01:30:54

Spring Boot之FilterRegistrationBean-自定义Filter

项目老的用spring写的,新的升级到了springboot,原代码中有在web.xml中定义过滤器,在boot中,自然没法这样用了,因而看了看boot如何使用自定义过滤器。

在springboot 中,主要是靠FilterRegistrationBean 这个类来提供这样的功能。

自定义 Filter

我们常常在项目中会使用 filters 用于录调用日志、排除有 XSS 威胁的字符、执行权限验证等等。Spring Boot 自动添加了 OrderedCharacterEncodingFilter 和 HiddenHttpMethodFilter,并且我们可以自定义 Filter。

两个步骤:

  • 1、实现 Filter 接口,实现 Filter 方法
  • 2、添加 @Configuration 注解,将自定义Filter加入过滤链

好吧,直接上代码

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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() {
        }
    }
}

SpringBoot FilterRegistrationBean对象支持web的filter的排序

1.FilterRegistrationBean对象可以实现对web Filter的排序,使用setOrder(int i)方法

具体代码如下:

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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 {          
        }      
    }
}

以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/qq_36850813/article/details/96130013