JSP 获取用户的真实IP两种实现方法详解

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

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; 
　　}