获取真实的ip地址

方法一：

public String getRemortIP(HttpServletRequest request) { 
    if (request.getHeader("x-forwarded-for") == null) { 
        return request.getRemoteAddr(); 
    } 
    return request.getHeader("x-forwarded-for"); 
}  

方法二：
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; 
}