java获取客户端的ip地址

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eg:

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; 
 }