java XJC限制将双精度转换为字符串

Question

我通过从XSD生成带有javax.xml.bind注释的类来读取XML

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="xsd:double" />
</xsd:complexType>

因此，我的类生成为：

public Double getBar(){....}

好的，为了确保双属性为正，我使用xsd:restriction

<xsd:simpleType name="DoublePositive">
  <xsd:restriction base="xsd:double">
    <xsd:minExclusive value="0" />
  </xsd:restriction>
</xsd:simpleType>

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="DoublePositive" />
</xsd:complexType>

太糟糕了，xjc生成了一个字符串而不是一个双精度字符串

public String getBar(){....}

我可以强制使用Double而不是String吗

解决方案：

我的问题错了。我有xsi:type="DoublePositive"而不是type="DoublePositive"

Answer 1

这是我的配置，我用它来生成类

1. 测试。xsd-您的xsd文件

    <?xml version="1.0" encoding="utf-8"?>
    <xsd:schema elementFormDefault="qualified" targetNamespace=""
                xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   
      <xsd:simpleType name="DoublePositive">
        <xsd:restriction base="xsd:double">
          <xsd:minExclusive value="0"/>
        </xsd:restriction>
      </xsd:simpleType>
   
      <xsd:complexType name="foo">
        <xsd:attribute name="bar" type="DoublePositive"/>
      </xsd:complexType>
    </xsd:schema>
   

2. 文本。xml-具有全局绑定的文件

   <jaxb:bindings version="2.1"
                   xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
                   xmlns:xs="http://www.w3.org/2001/XMLSchema">
   
      <jaxb:globalBindings generateElementProperty="false">
        <jaxb:javaType name="java.util.Double" xmlType="DoublePositive"
                       parseMethod="Converter.fromString"
                       printMethod="Converter.toString"/>
      </jaxb:globalBindings> 
    </jaxb:bindings>
   

3. 转换器。带有转换函数的java类

   public class Converter {
     public static Double fromString(String str){
       return Double.parseDouble(str);
     }
   
     public static String toString(Double value){
       return String.valueOf(value);
     }
   }
   

就这些。使用命令调用xjc

xjc -b test.xml -classpath . test.xsd

$ xjc -version
xjc version "JAXB 2.1.10" 
JavaTM Architecture for XML Binding(JAXB) Reference Implementation, (build JAXB 2.1.10)
$ xjc -b test.xml -classpath . test.xsd 
parsing a schema... 
[WARNING] EmptyTargetNamespace: In schema document 'file:/pwd/test.xsd', the
value of the 'targetNamespace' attribute cannot be an empty string.  
line 3 of file:/pwd/test.xsd

compiling a schema... 
generated/Adapter1.java
generated/Foo.java
generated/ObjectFactory.java 

和生成的文件内容：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "foo")
public class Foo {

    @XmlAttribute
    @XmlJavaTypeAdapter(Adapter1 .class)
    protected Double bar;

    /**
     * Gets the value of the bar property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public Double getBar() {
        return bar;
    }

    /**
     * Sets the value of the bar property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setBar(Double value) {
        this.bar = value;
    }

}

和适配器类

package generated;

import java.util.Double;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class Adapter1
    extends XmlAdapter<String, Double>
{


    public Double unmarshal(String value) {
        return (Converter.fromString(value));
    }

    public String marshal(Double value) {
        return (Converter.toString(value));
    }

}

因此，正如您所看到的，xjc正确地生成了类。如果您仍然得到一个String，那么可能您忘记了在配置中添加一些内容。但是如果没有关于配置的详细信息，就不可能说出代码的错误