WebFilter过滤器，返回指定信息

import java.io.IOException;
import java.util.HashSet;

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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;

@ConditionalOnProperty(prefix="test.ip.filter",name="ip",havingValue="true",matchIfMissing=false)
@WebFilter(filterName = "IpFilter", urlPatterns = {"/api/","/api2/"})
public class IPFilter implements Filter {

@Value("${query.filter.ipadress:}")
private String ips;

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

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
        throws IOException, ServletException {
    boolean needFilter = false;

    String paramNames = ((HttpServletRequest) servletRequest).getParameter("paramNames");
    String[] targetNames = new String[]{"","",""}for(String t:targetNames){
       if(t.equals(name)){
                needFilter = true;
                break;
            }
        }
    }
    if(!needFilter){
        filterChain.doFilter(servletRequest, servletResponse);
    }else{
        
        String ip = getIpAddress((HttpServletRequest) servletRequest);
        HashSet<String> ipSet = getIpList(ips);
        logger.debug("配置的过滤ip列表为：{},请求ip为：{},是否包含：{}",ips,ip,ipSet.contains(ip));
        if(ipSet.contains(ip)) {
            logger.warn("来自ip={}的请求任务，返回空值",ip);
            sendSometing("",servletResponse);
            return;
        }else {
            filterChain.doFilter(servletRequest, servletResponse);
        }
        
    }
}

@Override
public void destroy() {

}

public HashSet<String> getIpList(String ips){
    HashSet<String> set = new HashSet<>();
    String[] ipaddres = ips.split(",");
    for (String ipaddr : ipaddres) {
        if(ipaddr.contains("-")) {
            String[] ipt = ipaddr.split("-");
            int start = Integer.valueOf(ipt[0].substring(ipt[0].lastIndexOf(".") + 1));
            int end = Integer.valueOf(ipt[1]);
            for (int i = start; i <= end; i++) {
                set.add(ipt[0].substring(0,ipt[0].lastIndexOf(".") + 1)+ i);
            }
        }else {
            set.add(ipaddr);
        }
    }
    return set;
}

public void sendSometing(String reason, ServletResponse servletResponse) throws IOException {
    HttpServletResponse response = (HttpServletResponse) servletResponse;
    response.setStatus(HttpServletResponse.SC_OK);
    response.setContentType("text/plain; charset=UTF-8");
    response.getWriter().write(reason);
}

// 获取ip
public static String getIpAddress(HttpServletRequest request) {
    String ip = null;
    // X-Forwarded-For：Squid 服务代理
    String ipAddresses = request.getHeader("X-Forwarded-For");
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // Proxy-Client-IP：apache 服务代理
        ipAddresses = request.getHeader("Proxy-Client-IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // WL-Proxy-Client-IP：weblogic 服务代理
        ipAddresses = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // HTTP_CLIENT_IP：有些代理服务器
        ipAddresses = request.getHeader("HTTP_CLIENT_IP");
    }
    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        // X-Real-IP：nginx服务代理
        ipAddresses = request.getHeader("X-Real-IP");
    }
    // 有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号(,)分割开来，并且第一个ip为客户端的真实IP
    if (ipAddresses != null && ipAddresses.length() != 0) {
        ip = ipAddresses.split(",")[0];
    }
    // 还是不能获取到，最后再通过request.getRemoteAddr();获取
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
        ip = request.getRemoteAddr();
    }
    return ip;
}





public static void main(String[] args) {
    String ips = "172.10.1.210,172.10.10.220-225";
    HashSet<String> set = new HashSet<>();
    String[] ipaddres = ips.split(",");
    System.out.println(ipaddres[0]+"="+ipaddres[1]);
    for (String ipaddr : ipaddres) {
        if(ipaddr.contains("-")) {
            String[] ipt = ipaddr.split("-");
            int start = Integer.valueOf(ipt[0].substring(ipt[0].lastIndexOf(".") + 1));
            int end = Integer.valueOf(ipt[1]);
            for (int i = start; i <= end; i++) {
                set.add(ipt[0].substring(0,ipt[0].lastIndexOf(".") + 1)+ i);
            }
        }else {
            set.add(ipaddr);
        }
    }
    System.out.println(set.toString());
}

}