Place the below sample code in your application to receive the user agent values for browsers like safari, chrome ,IE , Mozilla

public String getUserAgentValue() {
FacesContext facesCtx = FacesContext.getCurrentInstance().getCurrentInstance();
ExternalContext externalctx = facesCtx.getExternalContext();
HttpServletRequest request = (HttpServletRequest)externalctx.getRequest();
String userAgentVal = null;
userAgentVal=request.getHeader(“User-Agent”);
userAgentVal=userAgentVal.toLowerCase();

if (userAgentVal != null && userAgentVal.indexOf(“iphone”) > -1) {
userAgentVal = “iPhone”;
}

else if (userAgentVal != null && userAgentVal.indexOf(“android”) > -1) {
if (userAgentVal.indexOf(“mobile”) > -1)
userAgentVal = “Android Phone”;
else
userAgentVal = “Android Tablet”;
}

else if (userAgentVal != null && userAgentVal.indexOf(“ipad”) > -1) {
userAgentVal = “iPad”;
}

else if (userAgentVal != null && userAgentVal.indexOf(“macintosh”) > -1) {
userAgentVal = “Macbook”;
}

else if (userAgentVal != null && userAgentVal.indexOf(“windows”) > -1) {
userAgentVal = “Windows”;
}

else
{
userAgentVal=”Could not identify…”;
}

return userAgentVal;
}