http请求获取客户端IP

iteye_9829

于 2014-08-04 16:48:57 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/iteye_9829/article/details/82601852

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本文提供了一个Java函数，用于从HttpServletRequest中获取客户端IP地址。该函数首先尝试从x-forwarded-for头中获取IP，然后是http_client_ip、Proxy-Client-IP等头，最后如果所有方式都失败，则使用远程地址。

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public String getIpAddr(HttpServletRequest request) {  
 String ip = request.getHeader("x-forwarded-for");  
 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.getRemoteAddr();  
 }  
 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_X_FORWARDED_FOR");  
 }  
 // 如果是多级代理，那么取第一个ip为客户ip   
 if (ip != null && ip.indexOf(",") != -1) {  
  ip = ip.substring(ip.lastIndexOf(",") + 1, ip.length()).trim();  
 }  
 return ip;  
}