java开发常用方法：获取客户端请求ip地址

public static String getRealIp(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;

}

获取请求ip地址的工具类，但安卓与苹果的系统的ip地址获取有伪链接，即多个ip地址，所以需要以下方法来进行ip地址的截取：

String ip = getRealIp(request);
if(ip.indexOf(",")!=-1){  
ip = ip.substring(0, ip.lastIndexOf(","));
}