java实现穿透代理获取客户端真实ip .
2014-02-17 14:16
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经过代理或者代理服务器以后,由于在客户端和服务之间增加了中间层,因此服务器无法直接拿到客户端的IP,服务器端应用也无法直接通过转发请求的地址返回 给客户端。但是在转发请求的HTTP头信息中,增加了X-FORWARDED-FOR信息,用以跟踪原有的客户端IP地址和原来客户端请求的服务器地址。 例如,当我们访问http://www.xxx.com/index.jsp/时,其实并不是我们浏览器真正访问到了服务器上的index.jsp文件,而是先由代理服务器去访问http://192.168.1.110:2046/index.jsp,代理服务器再将访问到的结果返回给我们的浏览器,因为是代理服务器去访问index.jsp的,所以index.jsp中通过request.getRemoteAddr()的方法获取的IP实际上是代理服务器的地址,并不是客户端的IP地址。
下面的方法在只有一级代理的情况下,可以保证获得客户端的真实IP地址:
[java]
view plaincopyprint?
public 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; }
可是,如果通过了多级反向代理的话,X-Forwarded-For的值并不止一个,而是一串Ip值,究竟哪个才是真正的用户端的真实IP呢?答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
如:X-Forwarded-For:192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100
用户真实IP为: 192.168.1.110
程序实现如下:
[java]
view plaincopyprint?
// 获取请求主机IP地址,如果通过代理进来,则透过防火墙获取真实IP地址
public String getIpAddr(HttpServletRequest request) {
String strClientIp = request.getHeader("x-forwarded-for");
log.info("All the IP address string is: " + strClientIp);
if(strClientIp == null || strClientIp.length() == 0 ||"unknown".equalsIgnoreCase(strClientIp))
{
strClientIp = request.getRemoteAddr();
}else{
StringList ipList = new StringList();
BusiAcceptAction.SplitsString(strClientIp, ',' , ipList); // 拆分字符串,可直接用String.plit方法
String strIp = new String();
for(int index = 0; index < ipList.size(); index ++)
{
strIp = (String)ipList.get(index);
if(!("unknown".equalsIgnoreCase(strIp)))
{
strClientIp = strIp;
break;
}
}
}
return strClientIp;
}
转载地址:/article/8529639.html
下面的方法在只有一级代理的情况下,可以保证获得客户端的真实IP地址:
[java]
view plaincopyprint?
public 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; }
public 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; }
可是,如果通过了多级反向代理的话,X-Forwarded-For的值并不止一个,而是一串Ip值,究竟哪个才是真正的用户端的真实IP呢?答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
如:X-Forwarded-For:192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100
用户真实IP为: 192.168.1.110
程序实现如下:
[java]
view plaincopyprint?
// 获取请求主机IP地址,如果通过代理进来,则透过防火墙获取真实IP地址
public String getIpAddr(HttpServletRequest request) {
String strClientIp = request.getHeader("x-forwarded-for");
log.info("All the IP address string is: " + strClientIp);
if(strClientIp == null || strClientIp.length() == 0 ||"unknown".equalsIgnoreCase(strClientIp))
{
strClientIp = request.getRemoteAddr();
}else{
StringList ipList = new StringList();
BusiAcceptAction.SplitsString(strClientIp, ',' , ipList); // 拆分字符串,可直接用String.plit方法
String strIp = new String();
for(int index = 0; index < ipList.size(); index ++)
{
strIp = (String)ipList.get(index);
if(!("unknown".equalsIgnoreCase(strIp)))
{
strClientIp = strIp;
break;
}
}
}
return strClientIp;
}
转载地址:/article/8529639.html
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