获得客户端真实ip

alvinchen1010

于 2010-12-09 11:02:10 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/alvinchen1010/article/details/83776734

本文介绍了一种从HTTP请求中获取客户端真实IP地址的方法。通过检查不同的HTTP头部信息（如x-forwarded-for、Proxy-Client-IP 和 WL-Proxy-Client-IP），如果这些头部不存在或者值为'unknown'，则使用request.getRemoteAddr()来获取IP。

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/**

     * 获得客户端真实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();    
        }