JAXB使用fractionDigits对BigDecimal进行编组 [英] JAXB marshalling for BigDecimal using fractionDigits

问题描述

所以这是我的问题。我给了一个XSD，我生成的XML文件应符合这个XSD。使用 org.apache.cxf.cxf-xjc-plugin maven插件和外部绑定文件生成源代码。但是当我在尝试编组我的对象时，生成的XML不符合我的要求。

我的XSD包含以下内容：

 < xsd：element maxOccurs =1minOccurs =0name =amount> ; 
< xsd：simpleType> 
< xsd：restriction base =xsd：decimal> 
< xsd：totalDigits value =13/> 
< xsd：fractionDigits value =2/> 
< / xsd：restriction> 
< / xsd：simpleType> 
< / xsd：element> 
 ... 
< xsd：element maxOccurs =1minOccurs =0name =rate> 
< xsd：simpleType> 
< xsd：restriction base =xsd：decimal> 
< xsd：totalDigits value =8/> 
< xsd：fractionDigits value =5/> 
< / xsd：restriction> 
< / xsd：simpleType> 
< / xsd：element> 
  

生成的XML片段如下所示：

 < amount> 109.5< / amount> 
 ... 
< rate> 10.25< / rate> 
  

虽然我原以为：

< pre class =lang-xml prettyprint-override> < amount> 109.50< / amount>
...
< rate> 10.25000< / rate>


有没有办法以干净的方式解决这个问题？

我不想为每一个 totalDigits ， fractionDigits 组合写几个适配器。由于XSD可能会发生变化，我想保持生成的源代码不变。

解决方案

你对于此用例，将需要使用 XmlAdapter 。下面是一个示例绑定文件，可帮助您生成它们。逻辑将包含在 DecimalFormatter 类中，该类包含所有不同格式的方法。

 < jxb：bindings xmlns：xs =http://www.w3.org/2001/XMLSchema
 xmlns：jxb =http：// java.sun.com/xml/ns/jaxbversion =2.1> 
< jxb：bindings schemaLocation =schema.xsd> 
< jxb：bindings node =// xs：element [@ name ='amount']> 
< jxb：property> 
< jxb：baseType> 
< jxb：javaType name =java.math.BigDecimal
 parseMethod =org.example.DecimalFormatter.parseDecimal
 printMethod =org.example.DecimalFormatter.printDecimal_2Places/> ; 
< / jxb：baseType> 
< / jxb：property> 
< / jxb：bindings> 
< jxb：bindings node =// xs：element [@ name ='rate']> 
< jxb：property> 
< jxb：baseType> 
< jxb：javaType name =java.math.BigDecimal
 parseMethod =org.example.DecimalFormatter.parseDecimal
 printMethod =org.example.DecimalFormatter.printDecimal_5Places/> ; 
< / jxb：baseType> 
< / jxb：property> 
< / jxb：bindings> 
< / jxb：bindings> 
< / jxb：bindings> 
  

更多信息

• http： //blog.bdoughan.com/2011/08/xml-schema-to-java-generating.html

So here's my problem. I'm given an XSD to which my generated XML file should comply. Using the org.apache.cxf.cxf-xjc-plugin maven plugin and an external binding file I generate the source code. But when I'm trying marshall my object the generated XML doesn't meet my requirements.

My XSD contains the following:

<xsd:element maxOccurs="1" minOccurs="0" name="amount">
  <xsd:simpleType>
    <xsd:restriction base="xsd:decimal">
      <xsd:totalDigits value="13" />
      <xsd:fractionDigits value="2" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:element>
...
<xsd:element maxOccurs="1" minOccurs="0" name="rate">
  <xsd:simpleType>
    <xsd:restriction base="xsd:decimal">
      <xsd:totalDigits value="8" />
      <xsd:fractionDigits value="5" />
    </xsd:restriction>
  </xsd:simpleType>
</xsd:element>

And the generated piece of XML looks like this:

<amount>109.5</amount>
...
<rate>10.25</rate>

While I was expecting it to be:

<amount>109.50</amount>
...
<rate>10.25000</rate>

Is there a way to solve this problem in a clean way?

I would prefer not writing several adapters for every single totalDigits, fractionDigits combination. And as the XSD is subject to change I'd like to leave the generated source code untouched.

解决方案

You will need to use XmlAdapter for this use case. Below is a sample binding file that will help you generate them. The logic would be contained in a DecimalFormatter class that contained methods for all the different required formats.

<jxb:bindings xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:jxb="http://java.sun.com/xml/ns/jaxb" version="2.1">
    <jxb:bindings schemaLocation="schema.xsd">
        <jxb:bindings node="//xs:element[@name='amount']">
            <jxb:property>
                <jxb:baseType>
                    <jxb:javaType name="java.math.BigDecimal"
                        parseMethod="org.example.DecimalFormatter.parseDecimal"
                        printMethod="org.example.DecimalFormatter.printDecimal_2Places" />
                </jxb:baseType>
            </jxb:property>
        </jxb:bindings>
        <jxb:bindings node="//xs:element[@name='rate']">
            <jxb:property>
                <jxb:baseType>
                    <jxb:javaType name="java.math.BigDecimal"
                        parseMethod="org.example.DecimalFormatter.parseDecimal"
                        printMethod="org.example.DecimalFormatter.printDecimal_5Places" />
                </jxb:baseType>
            </jxb:property>
        </jxb:bindings>
    </jxb:bindings>
</jxb:bindings>

For More Information

• http://blog.bdoughan.com/2011/08/xml-schema-to-java-generating.html

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