Springboot过滤器禁止ip频繁访问功能实现

在开发 Web 项目的时候，经常需要过滤器来处理一些请求，包括字符集转换什么的，记录请求日志什么的等等。在之前的 Web 开发中，我们习惯把过滤器配置到 web.xml 中，但是在 SpringBoot 中，兵没有这个配置文件，该如何操作呢？

1.编写一个过滤器：

import lombok.extern.slf4j.Slf4j; import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.Iterator;import java.util.Set;import java.util.concurrent.ConcurrentHashMap; @Slf4j@WebFilter(urlPatterns='/dyflight/*')public class IpFilter implements Filter{ /** * 默认限制时间（单位：ms）3600000,3600(s), */ private static final long LIMITED_TIME_MILLIS = 10 * 1000; /** * 用户连续访问最高阀值，超过该值则认定为恶意操作的IP，进行限制 */ private static final int LIMIT_NUMBER = 5; /** * 用户访问最小安全时间，在该时间内如果访问次数大于阀值，则记录为恶意IP，否则视为正常访问 */ private static final int MIN_SAFE_TIME = 5000; private FilterConfig config; @Override public void init(FilterConfig filterConfig) throws ServletException { this.config = filterConfig; //设置属性filterConfig } /* (non-Javadoc) * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain) */ @SuppressWarnings('unchecked') @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; ServletContext context = config.getServletContext(); // 获取限制IP存储器：存储被限制的IP信息 //Map<String, Long> limitedIpMap = (Map<String, Long>) context.getAttribute('limitedIpMap'); ConcurrentHashMap<String ,Long> limitedIpMap = (ConcurrentHashMap<String, Long>) context.getAttribute('limitedIpMap'); // 过滤受限的IP filterLimitedIpMap(limitedIpMap); // 获取用户IP String ip = IPUtil.getRemoteIpAddr(request); System.err.println('ip:'+ip); // 判断是否是被限制的IP，如果是则跳到异常页面 if (isLimitedIP(limitedIpMap, ip)) { long limitedTime = limitedIpMap.get(ip) - System.currentTimeMillis(); // 剩余限制时间(用为从毫秒到秒转化的一定会存在些许误差，但基本可以忽略不计) request.setAttribute('remainingTime', ((limitedTime / 1000) + (limitedTime % 1000 > 0 ? 1 : 0))); System.err.println('ip访问过于频繁：'+ip); throw new RuntimeException('ip访问过于频繁'); } // 获取IP存储器 ConcurrentHashMap<String, Long[]> ipMap = (ConcurrentHashMap<String, Long[]>) context.getAttribute('ipMap'); // 判断存储器中是否存在当前IP，如果没有则为初次访问，初始化该ip // 如果存在当前ip，则验证当前ip的访问次数 // 如果大于限制阀值，判断达到阀值的时间，如果不大于[用户访问最小安全时间]则视为恶意访问，跳转到异常页面 if (ipMap.containsKey(ip)) { Long[] ipInfo = ipMap.get(ip); ipInfo[0] = ipInfo[0] + 1; log.debug('当前第[' + (ipInfo[0]) + ']次访问'); if (ipInfo[0] > LIMIT_NUMBER) {Long ipAccessTime = ipInfo[1];Long currentTimeMillis = System.currentTimeMillis(); log.debug('ip访问过于频繁：currentTimeMillis: '+currentTimeMillis+' - ipAccessTime:'+ipAccessTime+' : ' + (currentTimeMillis - ipAccessTime) + '<='+ MIN_SAFE_TIME); if (currentTimeMillis - ipAccessTime <= MIN_SAFE_TIME) { limitedIpMap.put(ip, currentTimeMillis + LIMITED_TIME_MILLIS); request.setAttribute('remainingTime', LIMITED_TIME_MILLIS); log.debug('ip访问过于频繁：LIMITED_TIME_MILLIS:'+LIMITED_TIME_MILLIS); log.debug('ip访问过于频繁：'+ip); throw new RuntimeException('ip访问过于频繁');} else { initIpVisitsNumber(ipMap, ip);} } } else { initIpVisitsNumber(ipMap, ip); System.out.println('您首次访问该网站'); } context.setAttribute('ipMap', ipMap); chain.doFilter(request, response); } @Override public void destroy() { // TODO Auto-generated method stub } /** * @Description 过滤受限的IP，剔除已经到期的限制IP * @param limitedIpMap */ private void filterLimitedIpMap(ConcurrentHashMap<String, Long> limitedIpMap) { if (limitedIpMap == null) { return; } Set<String> keys = limitedIpMap.keySet(); Iterator<String> keyIt = keys.iterator(); long currentTimeMillis = System.currentTimeMillis(); while (keyIt.hasNext()) { long expireTimeMillis = limitedIpMap.get(keyIt.next()); log.debug('expireTimeMillis <= currentTimeMillis:'+ expireTimeMillis+' <='+ currentTimeMillis); if (expireTimeMillis <= currentTimeMillis) {keyIt.remove(); } } } /** * @Description 是否是被限制的IP * @param limitedIpMap * @param ip * @return true : 被限制 | false : 正常 */ private boolean isLimitedIP(ConcurrentHashMap<String, Long> limitedIpMap, String ip) { if (limitedIpMap == null || ip == null) { // 没有被限制 return false; } Set<String> keys = limitedIpMap.keySet(); Iterator<String> keyIt = keys.iterator(); while (keyIt.hasNext()) { String key = keyIt.next(); if (key.equals(ip)) {// 被限制的IPreturn true; } } return false; } /** * 初始化用户访问次数和访问时间 * * @param ipMap * @param ip */ private void initIpVisitsNumber(ConcurrentHashMap<String, Long[]> ipMap, String ip) { Long[] ipInfo = new Long[2]; ipInfo[0] = 0L;// 访问次数 ipInfo[1] = System.currentTimeMillis();// 初次访问时间 ipMap.put(ip, ipInfo); }}

2. 创建一个监听器：需要初始化俩个容器：

import lombok.extern.slf4j.Slf4j; import javax.servlet.ServletContext;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import javax.servlet.annotation.WebListener;import java.util.concurrent.ConcurrentHashMap; @Slf4j@WebListenerpublic class MyApplicationListener implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { log.debug('liting: contextInitialized'); log.debug('MyApplicationListener初始化成功'); ServletContext context = sce.getServletContext(); // IP存储器 ConcurrentHashMap<String, Long[]> ipMap = new ConcurrentHashMap<>(); context.setAttribute('ipMap', ipMap); // 限制IP存储器：存储被限制的IP信息 ConcurrentHashMap<String, Long> limitedIpMap = new ConcurrentHashMap<String, Long>(); context.setAttribute('limitedIpMap', limitedIpMap); log.debug('ipmap：'+ipMap.toString()+';limitedIpMap:'+limitedIpMap.toString()+'初始化成功。。。。。'); } @Override public void contextDestroyed(ServletContextEvent sce) { // TODO Auto-generated method stub }}

3.iputil

import javax.servlet.http.HttpServletRequest;import java.net.InetAddress;import java.net.UnknownHostException; public class IPUtil { public static String getRemoteIpAddr(HttpServletRequest request) { String ip = request.getHeader('x-forwarded-for'); if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('Proxy-Client-IP'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('WL-Proxy-Client-IP'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('HTTP_CLIENT_IP'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getHeader('HTTP_X_FORWARDED_FOR'); } if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); if('127.0.0.1'.equals(ip)||'0:0:0:0:0:0:0:1'.equals(ip)){//根据网卡取本机配置的IPInetAddress inet=null;try { inet = InetAddress.getLocalHost();} catch (UnknownHostException e) { e.printStackTrace();}ip= inet.getHostAddress(); } } return ip; } }

4配置

springboot启动类中添加过滤器和监听器的包扫描

@ServletComponentScan(basePackages='cn.xxx.common')

spring web.xml

过滤器

<filter> <filter-name>ipFilter</filter-name> <filter-class>com.xxxx.common.filter.IpFilter</filter-class> </filter> <filter-mapping> <filter-name>ipFilter</filter-name> <url-pattern>/dyflight/**</url-pattern> </filter-mapping>

监听器：

<listener> <listener-class>com.xxxx.common.Listener.MyApplicationListener</listener-class> </listener>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。