java 获取请求的ip地址

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import java.net.UnknownHostException;  
import javax.annotation.Resource;  
import javax.servlet.http.HttpServletRequest;  
import javax.xml.ws.WebServiceContext;  
import javax.xml.ws.handler.MessageContext;  
  
@Resource  
private WebServiceContext wsContext;    
/** 
* 获取请求来的ips  
* @param request 
* @return 
*/  
public String getIpAddr() {  
String ipAddress = null;  
MessageContext mc = wsContext.getMessageContext();  
HttpServletRequest request = (HttpServletRequest) (mc  
        .get(mc.SERVLET_REQUEST));  
ipAddress = request.getHeader("x-forwarded-for");  
if (ipAddress == null || ipAddress.length() == 0  
        || "unknown".equalsIgnoreCase(ipAddress)) {  
    ipAddress = request.getHeader("Proxy-Client-IP");  
}  
if (ipAddress == null || ipAddress.length() == 0  
        || "unknown".equalsIgnoreCase(ipAddress)) {  
    ipAddress = request.getHeader("WL-Proxy-Client-IP");  
}  
if (ipAddress == null || ipAddress.length() == 0  
        || "unknown".equalsIgnoreCase(ipAddress)) {  
    ipAddress = request.getRemoteAddr();  
          
    //这里主要是获取本机的ip,可有可无  
    if (ipAddress.equals("127.0.0.1")  
            || ipAddress.endsWith("0:0:0:0:0:0:1")) {  
        // 根据网卡取本机配置的IP  
        InetAddress inet = null;  
        try {  
            inet = InetAddress.getLocalHost();  
        } catch (UnknownHostException e) {  
            e.printStackTrace();  
        }  
        ipAddress = inet.getHostAddress();  
    }  
  
}  
  
// 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()  
                                                    // = 15  
    if (ipAddress.indexOf(",") > 0) {  
        ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));  
    }  
}  
 //或者这样也行,对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割    
//return ipAddress!=null&&!"".equals(ipAddress)?ipAddress.split(",")[0]:null;         
return ipAddress;  
}