[Java] 获取客户端ip地址

在做日志模块的时候，需要知道访问客户端的ip地址。起初用了

request.getRemoteAddr();

当时是在本地测试，取到的地址都是127.0.0.1或者是0:0:0:0:0:0:0:1。都是本机地址，一个是ipv4一个是ipv6，没在意。后来部署到阿里云之后发现也是同样的问题。开始怀疑是不是方法写的有问题。于是又百度到了新的方法。

/**** 获取客户端IP地址;这里通过了Nginx获取;X-Real-IP,* @param request* @return*/public static String getClientIP(HttpServletRequest request) {String fromSource = "X-Real-IP";String ip = request.getHeader("X-Real-IP");if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("X-Forwarded-For");fromSource = "X-Forwarded-For";}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("Proxy-Client-IP");fromSource = "Proxy-Client-IP";}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getHeader("WL-Proxy-Client-IP");fromSource = "WL-Proxy-Client-IP";}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getRemoteAddr();fromSource = "request.getRemoteAddr";}appLog.info("App Client IP: "+ip+", fromSource: "+fromSource);return ip;}

还是同样的结果。后来想到服务器配的是nginx + tomcat。nginx又是方向代理。监听80端口，映射本机tomcat的8080端口。在tomcat看来都是本地的80端口访问的，所以ip是localhost。于是在网上查找到了结果。nginx也需要配置几行，才能得到真实的ip地址。

location / {proxy_pass http://127.0.0.1:8080/myweb/;proxy_redirect    off;proxy_set_header  Host             $host;proxy_set_header  X-Real-IP        $remote_addr;proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;}

参考链接：

http://greatwqs.iteye.com/blog/1946982