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springboot过滤器禁止ip频繁访问

2020-09-29 13:05:50 作者：互联网

.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IP
            return 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);
}

}
　　

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
@WebListener
public 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IP
            InetAddress 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

ipFilter

com.xxxx.common.filter.IpFilter

ipFilter

/dyflight/**

监听器：

com.xxxx.common.Listener.MyApplicationListener

标签：66VX,http,springboot,ip,ERGD,148.122,dict,过滤器,com
来源： https://www.cnblogs.com/56uu/p/13749065.html