Java生成随机字符串

/**
 * 描述: Java 随机生成字符串
 */
public class CreateRandomStr {

    public static String createRandomStr1(int length){

        String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

        Random random = new Random();

        StringBuffer stringBuffer = new StringBuffer();

        for (int i = 0; i < length; i++) {

            int number = random.nextInt(62);

            stringBuffer.append(str.charAt(number));

        }

        return stringBuffer.toString();

    }
}