java生成随机编码的方法（新）。

 

import java.util.Calendar;


/** 
* @author : suyuyuan
* @date ：2016年6月3日 下午4:50:42 
* @version 1.0 
*/
public class CodeUtil {




public static String passWord(String id) {
String result = "";
int[] b = new int[id.length()];
for (int i = 0; i < id.length(); i++) {
char q = id.charAt(i);
b[i] = (int) (q - '0');// 字符数字-字符0就是实际的数字值，赋值给数字数组
}
int[] w = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
int[] c = { 1, 0, 9, 8, 7, 6, 5, 4, 3, 2 };
int sum = 0;
for (int j = 0; j < id.length(); j++) {
sum = sum + b[j] * w[j];
}
int r = sum % 10;
int res = c[r];
// if (res == 120) {
// result = "x";
// } else {
// result = String.valueOf(res);
// }
// if (res == 120) {
// result = "9";
// } else {
// result = String.valueOf(res);
// }
return result;
}


public static String createRandom(int ws) {
String cs = "0";
for (int i = 0; i < ws-1; i++ ) {
cs = cs + "0";
}
cs = "1" + cs;
int stochastic = new Double(Math.random() * Integer.valueOf(cs)).intValue();
 
String temp = "%0" + ws + "d";
String stocha = String.format(temp, stochastic);
return stocha;
}


public static String createBarCode(){

StringBuffer sBuffer = new StringBuffer();
//时分秒
Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
int second = cal.get(Calendar.SECOND);
int mm = cal.get(Calendar.MILLISECOND);

sBuffer.append(hour).append(minute).append(second).append(mm);

// 随机数7位
String random = createRandom(8);
// System.out.println(random);
sBuffer.append(random);


// 校验码
String check = CodeUtil.passWord(random);
// System.out.println(check);
sBuffer.append(check);

String str = sBuffer.toString();
return str;

}


public static void main(String[] args) {
for(int i=0;i<100;i++){
String str=CodeUtil.createBarCode();
System.out.println(str);
System.out.println(str.length());
}



}




}