XmlAttribute (Java EE 5)

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.xml.bind.annotation Annotation Type XmlAttribute

@Retention(value=RUNTIME) @Target(value={FIELD,METHOD}) public @interface XmlAttribute

Implements: Annotation

@Retention(value=RUNTIME)
@Target(value={FIELD, METHOD})

将 JavaBean 属性映射到 XML 属性。

用法

@XmlAttribute 注释能够与下列程序元素一起使用：

JavaBean 属性
字段

一个 static final 字段将被映射到 XML fixed 属性。

有关其他公共信息，请参阅 javax.xml.bind.package javadoc 中的“包规范”。

用法受到以下约束的限制：

如果字段或属性的类型是集合类型，则必须将集合项类型必须映射到简单模式类型。

     // Examples
     @XmlAttribute List<Integer> items; //legal
     @XmlAttribute List<Bar> foo; // illegal if Bar does not map to a schema simple type

如果字段或属性的类型是非集合类型，则必须将属性或字段的类型映射到简单模式类型。

     // Examples
     @XmlAttribute int foo; // legal
     @XmlAttribute Foo foo; // illegal if Foo does not map to a schema simple type

此注释可与以下注释一起使用：XmlID、XmlIDREF、XmlList、XmlSchemaType、XmlValue、XmlAttachmentRef、XmlMimeType、XmlInlineBinaryData 和 javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter。

示例 1：将 JavaBean 属性映射到 XML 属性。

     //Example: Code fragment
     public class USPrice { 
         @XmlAttribute
         public java.math.BigDecimal getPrice() {...} ;
         public void setPrice(java.math.BigDecimal ) {...};
     }

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="USPrice">
       <xs:sequence>
       </xs:sequence>
       <xs:attribute name="price" type="xs:decimal"/>
     </xs:complexType>

示例 2：将 JavaBean 属性映射到带有匿名类型的 XML 属性。

请参阅 @XmlType 中的示例 7。

示例 3：将 JavaBean 集合属性映射到 XML 属性。

     // Example: Code fragment
     class Foo {
         ...
         @XmlAttribute List<Integer> items;
     } 

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="foo">
     	 ...
       <xs:attribute name="items">
         <xs:simpleType>
           <xs:list itemType="xs:int"/>
         </xs:simpleType>
     </xs:complexType>

version

$Revision: 1.14 $

since

JAXB2.0

See also

javax.xml.bind.annotation.XmlType

英文文档：

Maps a JavaBean property to a XML attribute.

Usage

The @XmlAttribute annotation can be used with the following program elements:

JavaBean property
field

A static final field is mapped to a XML fixed attribute.

See "Package Specification" in javax.xml.bind.package javadoc for additional common information.

The usage is subject to the following constraints:

If type of the field or the property is a collection type, then the collection item type must be mapped to schema simple type.

     // Examples
     @XmlAttribute List<Integer> items; //legal
     @XmlAttribute List<Bar> foo; // illegal if Bar does not map to a schema simple type

If the type of the field or the property is a non collection type, then the type of the property or field must map to a simple schema type.
```
     // Examples
     @XmlAttribute int foo; // legal
     @XmlAttribute Foo foo; // illegal if Foo does not map to a schema simple type
 
```
This annotation can be used with the following annotations: XmlID, XmlIDREF, XmlList, XmlSchemaType, XmlValue, XmlAttachmentRef, XmlMimeType, XmlInlineBinaryData, XmlJavaTypeAdapter

Example 1: Map a JavaBean property to an XML attribute.

     //Example: Code fragment
     public class USPrice { 
         @XmlAttribute
         public java.math.BigDecimal getPrice() {...} ;
         public void setPrice(java.math.BigDecimal ) {...};
     }

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="USPrice">
       <xs:sequence>
       </xs:sequence>
       <xs:attribute name="price" type="xs:decimal"/>
     </xs:complexType>

Example 2: Map a JavaBean property to an XML attribute with anonymous type.

See Example 7 in @XmlType.

Example 3: Map a JavaBean collection property to an XML attribute.

     // Example: Code fragment
     class Foo {
         ...
         @XmlAttribute List<Integer> items;
     } 

     <!-- Example: XML Schema fragment -->
     <xs:complexType name="foo">
         ...
       <xs:attribute name="items">
         <xs:simpleType>
           <xs:list itemType="xs:int"/>
         </xs:simpleType>
     </xs:complexType>

Since:: JAXB2.0
Version:: $Revision: 1.14 $
Author:: Sekhar Vajjhala, Sun Microsystems, Inc.
See Also:: XmlType

Optional Element Summary
`String`	`name` Name of the XML Schema attribute.
`String`	`namespace` Specifies the XML target namespace of the XML Schema attribute.
`boolean`	`required` Specifies if the XML Schema attribute is optional or required.

abstract public String name()
XML 模式属性的名称。默认情况下，XML 模式属性名称派生自 JavaBean 属性名称。

英文文档：
name

public abstract String name

Name of the XML Schema attribute. By default, the XML Schema attribute name is derived from the JavaBean property name.

Default:: "##default"

abstract public boolean required()
指定 XML 模式属性是可选的还是必需的。如果为 true，则将 JavaBean 属性映射到必需的 XML 模式属性。否则，将它映射到可选的 XML 模式属性。

英文文档：
required

public abstract boolean required

Specifies if the XML Schema attribute is optional or required. If true, then the JavaBean property is mapped to a XML Schema attribute that is required. Otherwise it is mapped to a XML Schema attribute that is optional.