royalhotelInfo/src/util/Info.java

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package util;



import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.Set;

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

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;


public class Info {
	
	public static String generalFileName(String srcFileName) {
		try{
		   int index=srcFileName.lastIndexOf(".");
		   return StrUtil.generalSrid()+srcFileName.substring(index).toLowerCase();
		}catch(Exception e){
			return StrUtil.generalSrid();
		}
	}

	public synchronized static String getID() {
		Random random = new Random();
		StringBuffer ret = new StringBuffer(20);
		String rand = String.valueOf(Math.abs(random.nextInt()));
		ret.append(getDateStr());
		ret.append(rand.substring(0,6));
		
		return ret.toString();
	} 
	
	public synchronized static String subStr(String source,int length) {
		if(source.length()>length)
		{
			source=source.substring(0,length)+"...";