在IIS+Weblogic整合系统中，像移动网关一样，iisforward这个ISAPI过滤器也会对request对象进行再包装，附加一些WLS要用的头信息。这种情况下，直接用request.getRemoteAddr()是无法取到真正的客户IP的。

实际的iisforward附加头如下：

WL-Proxy-Client-IP=211.161.1.239
Proxy-Client-IP=211.161.1.239
X-Forwarded-For=211.161.1.239
WL-Proxy-Client-Keysize=
WL-Proxy-Client-Secretkeysize=
X-WebLogic-Request-ClusterInfo=true
X-WebLogic-KeepAliveSecs=30
X-WebLogic-Force-JVMID=-327089098
WL-Proxy-SSL=false

public String getIpAddr(HttpServletRequest request) {
    String ip=request.getHeader("X-Forwarded-For");
    if(ip == null || ip.length() == 0) {
        ip=request.getHeader("Proxy-Client-IP");
    }
    if(ip == null || ip.length() == 0) {
        ip=request.getHeader("WL-Proxy-Client-IP");
    }
    if(ip == null || ip.length() == 0) {
        ip=request.getRemoteAddr();
    }
    return ip;
}