Java-获取真实用户ip

import common.util.StringUtil;
import org.springframework.web.bind.annotation.ModelAttribute;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class BaseController {
    protected HttpServletRequest request;
    protected HttpServletResponse response;
    protected HttpSession session;

    @ModelAttribute
    public void setReqAndRes(HttpServletRequest request, HttpServletResponse response) {
        this.request = request;
        this.response = response;
        this.session = request.getSession();
    }
    /**
     * 使用nginx反向代理后获取请求端真实IP
     * @return
     */
    public String getClientIP() {
        String ip = request.getHeader("X-Forwarded-For");
        if(!StringUtil.isBlank(ip) && !"unknown".equalsIgnoreCase(ip)){
            //优先考虑多重代理的情况，应该取第0位的ip值
            System.out.println("ip=>"+ip);
            ip = ip.split(", ")[0];
            System.out.println("ip==>"+ip);

        }
        if (StringUtil.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            //目前没有遇到多重代理，一般在X-Real-IP中就能获得
            ip = request.getHeader("X-Real-IP");
            System.out.println("ip===>"+ip);
        }
        if (StringUtil.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            System.out.println("ip====>"+ip);
        }
        return ip;
    }
}

 需要的业务代码继承此类,再在适当处调用其中方法即可;

PS:

　　1.客户端A调用服务B,服务B调用服务C,若在服务C中以此方法获取真实ip,只能获取服务B的ip,并无法获取客户端A的ip;

　　2.若想服务C中想获取客户端A的真实ip,则需服务B将客户端A的ip在请求服务C的接口中将客户端A的真实ip填入request

　　　的X-Forwarded-For属性中.