jstl display decimal problems, ask. . .

921384

Hello everyone, I use a SQL statement to query a result, and the result is 0.3 on the mysql query browser, but I use jstl <c: out value = ""> to display it is a very long decimal: 0.30000000000000004,

May I ask what is the reason? How to solve?

nbalyt

You didn't use formatting
The introduction of the java.util.Currency class, the currencyCode attribute priority of <fmt:formatNumber> **** exceeds
            currencySymbol property. But for older versions of JDK, the currencySymbol attribute has priority.
            maxIntegerDigits, minIntegerDigits, maxFractionDigits and
            The minFractionDigits attribute is used to control the number of significant digits displayed before and after the decimal point. These attributes require integer values.
            groupingUsed
            The attribute has a boolean value and controls whether to group the numbers before the decimal point. For example, in the English language environment, divide every three digits of the larger number into a group, and each group is delimited by a comma. Other locales use periods or spaces to delimit such groups. The default value of this attribute is
            true.
            Listing 3 shows a simple currency example, which itself is an extension of Listing 1. In this case, don’t specify currencyCode or
            currencySymbol property. The currency is determined by the locale setting.

            Listing 3. Use the <fmt:formatNumber> tag to display currency values

<table>
<fmt:timeZone value="US/Eastern">
<c:forEach items="${entryList}" var="blogEntry"
varStatus="status">
<c:if test="${status.first}">
        <tr><td align="left" class="blogDate">
          <fmt:formatDate value=
              "${blogEntry.created}" dateStyle="full"/>
        </td></tr>
      </c:if>
      <tr><td align="left" class="blogTitle">
        <c:out value="${blogEntry.title}" escapeXml="false"/>
      </td></tr>
    <tr><td align="left" class="blogText">
      <c:out value="${blogEntry.text}" escapeXml="false"/>
      <font class="blogPosted">
        [My <fmt:formatNumber value="0.02" type="currency"/>
         posted at <fmt:formatDate value="${blogEntry.created}"
                                   pattern="h:mm a zz"/>]
      </font>
    </td></tr>
  </c:forEach>
  </fmt:timeZone>
</table>