package com.tenpay.util;

import java.text.SimpleDateFormat;
import java.util.Date;

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

public class TenpayUtil {
	
	/**
	 * 把对象转换成字符串
	 * @param obj
	 * @return String 转换成字符串,若对象为null,则返回空字符串.
	 */
	public static String toString(Object obj) {
		if(obj == null)
			return "";
		
		return obj.toString();
	}
	
	/**
	 * 把对象转换为int数值.
	 * 
	 * @param obj
	 *            包含数字的对象.
	 * @return int 转换后的数值,对不能转换的对象返回0。
	 */
	public static int toInt(Object obj) {
		int a = 0;
		try {
			if (obj != null)
				a = Integer.parseInt(obj.toString());
		} catch (Exception e) {

		}
		return a;
	}
	
	/**
	 * 获取当前时间 yyyyMMddHHmmss
	 * @return String
	 */ 
	public static String getCurrTime() {
		Date now = new Date();
		SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
		String s = outFormat.format(now);
		return s;
	}
	
	/**
	 * 获取当前日期 yyyyMMdd
	 * @param date
	 * @return String
	 */
	public static String formatDate(Date date) {
		SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
		String strDate = formatter.format(date);
		return strDate;
	}
	
	/**
	 * 取出一个指定长度大小的随机正整数.
	 * 
	 * @param length
	 *            int 设定所取出随机数的长度。length小于11
	 * @return int 返回生成的随机数。
	 */
	public static int buildRandom(int length) {
		int num = 1;
		double random = Math.random();
		if (random < 0.1) {
			random = random + 0.1;
		}
		for (int i = 0; i < length; i++) {
			num = num * 10;
		}
		return (int) ((random * num));
	}
	
	/**
	 * 获取编码字符集
	 * @param request
	 * @param response
	 * @return String
	 */
	public static String getCharacterEncoding(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;
	}
	
	/**
	 * 获取unix时间，从1970-01-01 00:00:00开始的秒数
	 * @param date
	 * @return long
	 */
	public static long getUnixTime(Date date) {
		if( null == date ) {
			return 0;
		}
		
		return date.getTime()/1000;
	}
		
}
