stringutil.java

一个网上购书系统

package com.bookstore.util;

import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import java.util.StringTokenizer;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 
 * @author zhanghong
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 * MSN:
 */
public class StringUtil
{
	/**
	 * @param srcDate
	 * @return
	 * @deprecated 只用于日期为dd/MM/yyyy的日期转换
	 */
	public static String ConvertDate(String srcDate)
	{
		String[] date = GetTokens(srcDate, "/");
		return new String(date[2] + "-" + date[1] + "-" + date[0]);
	}

	public static String Base64Encoder(String str)
	{
		if (str != null && !str.equals(""))
		{
			str = new BASE64Encoder().encode(str.getBytes());
			return str;
		}
		else
			return str;
	}

	public static String Base64Decoder(String str)
	{
		if (str == null || str.equals(""))
			return str;
		try
		{
			return new String(new BASE64Decoder().decodeBuffer(str));
		}
		catch (Exception e)
		{
			return null;
		}
	}

	public static boolean isSameDate(String strSrcDate, String strDesDate)
	{
		String[] srcDate = GetTokens(strSrcDate, "-");
		String[] desDate = GetTokens(strDesDate, "-");
		if (srcDate[0].equals(desDate[0]) && srcDate[1].equals(desDate[1]) && srcDate[2].equals(desDate[2]))
			return true;
		return false;
	}

	public static String[] GetTokens(String str, String token)
	{
		StringTokenizer st = new StringTokenizer(str, token);
		String subStr[] = new String[st.countTokens()];
		for (int i = 0; i < subStr.length; i++)
			subStr[i] = st.nextToken();

		return subStr;
	}

	public static String SetTokens(String[] str, String token)
	{
		String subStr = "";

		for (int i = 0; i < str.length; i++)
		{
			subStr += str[i];
			if (i != str.length - 1)
				subStr += token;
		}
		return subStr;
	}

	public static String getDateString(long lDateTime, String fmt)
	{
		SimpleDateFormat ft = new SimpleDateFormat(fmt);
		if (fmt == null || fmt.equals(""))
			fmt = new String("yyyy-MM-dd hh:mm:ss");
		Date date;
		if (lDateTime == 0)
			date = new Date(System.currentTimeMillis());
		else
			date = new Date(lDateTime);
		String dateStr = ft.format(date);
		return dateStr;
	}

	public static String getDateString(Date DateTime, String fmt)
	{
		if (fmt == null || fmt.equals(""))
			fmt = new String("yyyy-MM-dd hh:mm:ss");
		SimpleDateFormat ft = new SimpleDateFormat(fmt);
		String dateStr = ft.format(DateTime);
		return dateStr;
	}

	public static String genDateString()
	{
		return genDateString("yyyy-MM-dd");
	}

	public static String genDateTimeString()
	{
		return genDateString("yyyy-MM-dd HH:mm:ss");
	}
	
	public static String genDateString(String fmt)
	{
		SimpleDateFormat ft = new SimpleDateFormat(fmt);
		Date now = new Date(System.currentTimeMillis());
		String dateStr = ft.format(now);
		return dateStr;
	}

	public static String ToEncoding(String l_S_Source, String encoding) throws UnsupportedEncodingException
	{
		String l_S_Desc = "";
		if (l_S_Source != null && !l_S_Source.trim().equals(""))
		{
			byte l_b_Proc[] = l_S_Source.getBytes(encoding);
			l_S_Desc = new String(l_b_Proc);
		}
		return l_S_Desc;
	}

	public static String RandomNumber()
	{
		Random rdm = new Random(System.currentTimeMillis());
		return Long.toString(Math.abs(rdm.nextLong()));
	}

	public static String replaceAll(String s, String oldToken, String newToken)
	{
		String result = s;
		StringBuffer sb = new StringBuffer(result);
		int pos, start = 0;
		while ((pos = result.indexOf(oldToken, start)) != -1)
		{
			sb.replace(pos, pos + oldToken.length(), newToken);
			start = pos + newToken.length();
			result = sb.toString();
		}
		return result;
	}

	public static String toISO8859_1(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes(), "ISO8859_1");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toGB2312(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes(), "gb2312");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toGBISO(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes("gb2312"), "iso8859_1");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toISOGB(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes("iso8859_1"), "gb2312");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toUTF8(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes(), "UTF-8");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toGBUTF8(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes("gb2312"), "UTF-8");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	public static String toUTF8GB(String src)
	{
		String s = "";
		try
		{
			s = new String(src.getBytes("UTF-8"), "gb2312");
		}
		catch (Exception e)
		{
		}

		return s;
	}

	/*public static String getRandCode(int i)
	{
		String ret = "";
		Random rand = new Random();
		ret = String.valueOf(rand.nextInt(i));

		return ret;
	}
*/
	public static String getRandCode(int i)
	{
	    String ret = "";
	    for(int k=0;k<i;k++)
	    {
	        Random rand = new Random();
	        ret += String.valueOf(rand.nextInt(9));
	    }
	
	    return ret;
	}
	public String firstToUpperCase(String str)
	{
		String s1 = str.substring(0, 1);
		String s2 = str.substring(1);

		return s1.toUpperCase() + s2;
	}
	//MD5加密
	public static String md5Encrypt(String input) 
	{
		return org.apache.commons.codec.digest.DigestUtils.md5Hex(input);
	}
}