java生成client_id和生成随机数字和字母组合client_secret

package util;

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

import tea.service.SMS;

/** 
 * @author zcq
 * @version 创建时间：2015-5-5 上午11:39:21 
 * 根据随机数和时间戳生成唯一id
 */
public class RandTimeUid {

	public static String getUid(){
		StringBuffer sb = new StringBuffer();
		
		long id=(long)((Math.random()*9+1)*100000);
		String num = String.format("%06d", id);
		sb.append(num);
		SimpleDateFormat df = new SimpleDateFormat("yyMMddHHmm");
		sb.append(df.format(new Date()));
		Random random = new Random();
		sb.append(random.nextInt(100)+10);
		return sb.toString();
	}
	
	public static String getKey(String uid){
		String key = SMS.md5(uid);
		return key;
	}
	
	public static String getCharAndNumr(int length)     
	{     
	    String val = "";     
	             
	    Random random = new Random();     
	    for(int i = 0; i < length; i++)     
	    {     
	        String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num"; // 输出字母还是数字     
	                 
	        if("char".equalsIgnoreCase(charOrNum)) // 字符串     
	        {     
	            int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; //取得大写字母还是小写字母     
	            val += (char) (choice + random.nextInt(26));     
	        }     
	        else if("num".equalsIgnoreCase(charOrNum)) // 数字     
	        {     
	            val += String.valueOf(random.nextInt(10));     
	        }     
	    }     
	             
	    return val;     
	}
	
	public static void main(String[] args) {
		/*String uid = RandTimeUid.getUid();
		System.out.println(uid);*/
		String secret = getCharAndNumr(32);
		System.out.println(secret);
	}
	
}