package com.jepsoninfo.util;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class NetUtils {
	public static String getClientIp() {
		printHttpHeader(((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest());
		if (((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest()
				.getHeader("x-forwarded-for") == null) {
			return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest()
					.getRemoteAddr();
		}

		return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest()
				.getHeader("x-forwarded-for");
	}

	public static String getUserAgent() {
		return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest()
				.getHeader("user-agent");
	}

	/**
	 * 获取编码字符集
	 * 
	 * @param request
	 * @param response
	 * @return String
	 */

	public static String getCharEncoding(HttpServletRequest request, HttpServletResponse response) {

		if (null == request || null == response) {
			return "gbk";
		}

		String enc = request.getCharacterEncoding();
		if (null == enc || "".equals(enc)) {
			enc = response.getCharacterEncoding();
		}

		if (null == enc || "".equals(enc)) {
			enc = "gbk";
		}

		return enc;
	}
	
	public static void printHttpHeader(HttpServletRequest request) {
        Enumeration<String> headerNames = request.getHeaderNames();
        while(headerNames.hasMoreElements()) {//判断是否还有下一个元素
            String nextElement = headerNames.nextElement();//获取headerNames集合中的请求头
            String header2 = request.getHeader(nextElement);//通过请求头得到请求内容
        }
    }
}