生成随机字符串

/**
 * @Author : lilong
 * @Description :根据生成随机数算法等到随机数---长度为10位的随机字符串
 * @Date : 10:12 2018/5/4
 **/
public static final String allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

public static String getNonce() {
    StringBuffer sb = new StringBuffer();
    Random random = new Random();
    for (int i = 0; i < 10; i++) {
        sb.append(allChar.charAt(random.nextInt(allChar.length())));
    }
    System.err.println(sb.toString());
    return sb.toString();
}