nginx代理tomcat系统不能获取真实ip解决办法

出自：http://rguess.iteye.com/blog/2079618

nginx代理tomcat的时候，tomcat获取的客户端不是客户端传过来的ip，出现这种情况的原因很明显，nginx作为代理服务器先拦截客户端发来的请求，它再以localhost的身份转发给tomcat去处理。解决办法在nginx配置中的location节点中加入以下： 
        proxy_set_header Host $host; 
        proxy_set_header X-Real-IP $remote_addr; 
        proxy_set_header REMOTE-HOST $remote_addr; 
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 

java可以这样获取远程ip 

public static String getIpAddr(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.getRemoteAddr();
        }
        return ip;
}