import java.math.BigDecimal;

import org.apache.commons.lang.RandomStringUtils;

public class NumberUtil {

private static final int DEF_DIV_SCALE = 2;

/**

* 判断字符串是否为数字

* @param num

* @return

*/

public static boolean isNumberic(String num){

return (null == num || num.length() <= 0 || num.matches("\\d{1,}")) ? true : false;

}

/**

* @return 返回12位随机数

*/

public static String randomNumber()

{

return RandomStringUtils.randomNumeric(12);

}

/**

* @param parm

* @return 返回指定位数随机数

*/

public static String randomNumber(int parm)

{

return RandomStringUtils.randomNumeric(parm);

}

/**

* @return 返回纯数字和字母的GUID

*/

public static String randomUUID()

{

return GuidUtil.randomGuidUtil().toString().replaceAll("-","");

}

/**

* @param parm

* @return 返回指定位数的GUID

*/

public static String randomUUID(int parm)

{

return GuidUtil.randomGuidUtil().toString().replaceAll("-","").substring(0,parm);

}

/**

* * 两个Double数相加 *

*

* @param v1 *

* @param v2 *

* @return Double

*/

public static Double add(Double v1, Double v2) {

BigDecimal b1 = new BigDecimal(v1.toString());

BigDecimal b2 = new BigDecimal(v2.toString());

return new Double(b1.add(b2).doubleValue());

}

/**

* * 两个Double数相减 *

*

* @param v1 *

* @param v2 *

* @return Double

*/

public static Double sub(Double v1, Double v2) {

BigDecimal b1 = new BigDecimal(v1.toString());

BigDecimal b2 = new BigDecimal(v2.toString());

return new Double(b1.subtract(b2).doubleValue());

}

/**

* * 两个Double数相乘 *

*

* @param v1 *

* @param v2 *

* @return Double

*/

public static Double mul(Double v1, Double v2) {

BigDecimal b1 = new BigDecimal(v1.toString());

BigDecimal b2 = new BigDecimal(v2.toString());

return new Double(b1.multiply(b2).doubleValue());

}

/**

* * 两个Double数相除 *

*

* @param v1 *

* @param v2 *

* @return Double

*/

public static Double div(Double v1, Double v2) {

BigDecimal b1 = new BigDecimal(v1.toString());

BigDecimal b2 = new BigDecimal(v2.toString());

return new Double(b1

.divide(b2, DEF_DIV_SCALE, BigDecimal.ROUND_HALF_UP)

.doubleValue());

}

/**

* * 两个Double数相除，并保留scale位小数 *

*

* @param v1 *

* @param v2 *

* @param scale *

* @return Double

*/

public static Double div(Double v1, Double v2, int scale) {

if (scale < 0) {

throw new IllegalArgumentException(

"The scale must be a positive integer or zero");

}

BigDecimal b1 = new BigDecimal(v1.toString());

BigDecimal b2 = new BigDecimal(v2.toString());

return new Double(b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP)

.doubleValue());

}

/**

* @param v1

* @return 返回指定Double的负数

*/

public static Double neg(Double v1) {

return sub(new Double(0),v1);

}

}