将BigDecimal转成字符串为科学计数法的踩坑记录

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costBudgetEntity.getInitTotalAmount().toString()//获取初始预算金额的字符串

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costBudgetEntity.getInitTotalAmount().toString()//金额为12000000输出的结果为1.2E+7这种的字符串

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/**

* Returns a string representation of this {@code BigDecimal}

* without an exponent field.  For values with a positive scale,

* the number of digits to the right of the decimal point is used

* to indicate scale.  For values with a zero or negative scale,

* the resulting string is generated as if the value were

* converted to a numerically equal value with zero scale and as

* if all the trailing zeros of the zero scale value were present

* in the result.

*

* The entire string is prefixed by a minus sign character '-'

* (<tt>'&#92;u002D'</tt>) if the unscaled value is less than

* zero. No sign character is prefixed if the unscaled value is

* zero or positive.

*

* Note that if the result of this method is passed to the

* {@linkplain #BigDecimal(String) string constructor}, only the

* numerical value of this {@code BigDecimal} will necessarily be

* recovered; the representation of the new {@code BigDecimal}

* may have a different scale.  In particular, if this

* {@code BigDecimal} has a negative scale, the string resulting

* from this method will have a scale of zero when processed by

* the string constructor.

*

* (This method behaves analogously to the {@code toString}

* method in 1.4 and earlier releases.)

*

* @return a string representation of this {@code BigDecimal}

* without an exponent field.

* @since 1.5

* @see #toString()

* @see #toEngineeringString()

*/

public String toPlainString() {

    if(scale==0) {

        if(intCompact!=INFLATED) {

            return Long.toString(intCompact);

        } else {

            return intVal.toString();

        }

    }

    if(this.scale<0) { // No decimal point

        if(signum()==0) {

            return "0";

        }

        int tailingZeros = checkScaleNonZero((-(long)scale));

        StringBuilder buf;

        if(intCompact!=INFLATED) {

            buf = new StringBuilder(20+tailingZeros);

            buf.append(intCompact);

        } else {

            String str = intVal.toString();

            buf = new StringBuilder(str.length()+tailingZeros);

            buf.append(str);

        }

        for (int i = 0; i < tailingZeros; i++)

            buf.append('0');

        return buf.toString();

    }

    String str ;

    if(intCompact!=INFLATED) {

        str = Long.toString(Math.abs(intCompact));

    } else {

        str = intVal.abs().toString();

    }

    return getValueString(signum(), str, scale);

}

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costBudgetEntity.getInitTotalAmount().toPlainString() //金额为12000000输出的结果为12000000字符串