在jsf中以2点十进制格式显示数字 [英] Displaying a number in 2 point decimal format in jsf

问题描述

我使用的是 JSF 2 和 RichFaces 3.在下图中，数字显示为数据库中的数字.

I am using JSF 2 and RichFaces 3. Here in the picture shown below, numbers are being displayed as what they are in the database.

但我想将它们显示为 6749395.20 如果有小数部分和 5095138.00 如果没有小数部分.

But I want to display them as 6749395.20 if fraction part is there and 5095138.00 if no fraction part is there.

到目前为止，我已经尝试过这样的事情.

As of now I have tried something like this.

 <rich:column>
    <f:facet name="header">
        <h:outputText value="Total Amount"/>
    </f:facet>
    <h:outputText value="#{rr[2]}">
        <f:convertNumber type="number" groupingUsed="true" minFractionDigits="2" pattern="#0.00"/>
    </h:outputText>
 </rich:column>

实际上我将它们全部展示在一起，但我已经尝试将它们作为所有可能的组合使用 type、groupingUsed、minFractionDigits 和 pattern.

Actually I am showing all of them together, but I have tried with all of them as all possible combinations with type, groupingUsed, minFractionDigits and pattern.

为什么不起作用?这是怎么引起的，我该如何解决?

Why does it not work? How is this caused and how can I solve it?

推荐答案

如果值不是 Number，例如 String.然后，您基本上对它所代表的数据使用了错误的类型.要在 Java 中表示货币，您应该使用 BigDecimal.另外，请确保数据库表中的类型正确，即它不应是 varchar，而是小数.

That can happen if the value is not a Number at all, for example a String. You're then basically using the wrong type for the data it represents. To represent currencies in Java, you should be using BigDecimal. Also, make sure that the type in the database table is right, i.e. it should not be a varchar, but a decimal.

一旦您修复了数据类型，<f:convertNumber> 就会按照您的要求工作.请注意，pattern 属性将覆盖 groupingUsed 和 minFractionDigits.您应该使用 pattern 或 其他的.此外，type="number" 已经是默认值，因此可以将其删除.

Once you've fixed the data type, then the <f:convertNumber> will work as you told it to do. Note that the pattern attribute will override the groupingUsed and minFractionDigits. You should use either the pattern or the others. Also, type="number" is already the default, so it can be removed.

所以，要么使用

<f:convertNumber pattern="#0.00" />

或

<f:convertNumber groupingUsed="true" minFractionDigits="2" />

请注意，它们生成不同的格式.您可能希望将分组设置为 false.

Note that they generate different formats. You probably want to set grouping to false.

您也可以使用 type="currency"，然后它会根据 UIViewRoot#getLocale() 自动应用正确的模式:

You can also use type="currency", it will then automatically apply the right pattern as per the UIViewRoot#getLocale():

<f:convertNumber type="currency" />

另见标签库文档和DecimalFormat javadoc.

See also the tag library documentation and the DecimalFormat javadoc.

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