我是 XML 的新手。我正在做一个 Java EE 项目 REST 实现,我们返回了很多 XML。有了这个,我们决定使用 JAXB。到目前为止,我们为 XML 手动编码了模型。
但是已经有这些复杂的结构我们不知道如何编码。我们已经阅读了有关从 XSD 生成类的内容。我们确实有 XSD。
我的问题:
1.) 我读过 XJC,在哪里可以找到它?
2.) 我们必须安装整个 JAXB 吗? (所以到目前为止我们使用的是什么?这不是 JAXB 吗?)
最佳答案
XJC 包含在从 Java SE 6 开始的 JDK 的 bin 目录中。示例参见:
博客内容如下:
使用 JAXB 处理 Atom 提要 Atom 是一种用于表示 Web 提要的 XML 格式。标准格式允许阅读器应用程序显示来自不同来源的提要。在此示例中,我们将处理此博客的 Atom 提要。
演示
在此示例中,我们将使用 JAXB 将与此博客对应的 Atom XML 提要转换为对象,然后再转换回 XML。
import java.io.InputStream;
import java.net.URL;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;
import org.w3._2005.atom.FeedType;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance("org.w3._2005.atom");
Unmarshaller unmarshaller = jc.createUnmarshaller();
URL url = new URL("http://bdoughan.blogspot.com/atom.xml");
InputStream xml = url.openStream();
JAXBElement<feedtype> feed = unmarshaller.unmarshal(new StreamSource(xml), FeedType.class);
xml.close();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(feed, System.out);
}
}
JAXB 模型
以下模型由模式生成到 Java 编译器 (XJC)。我省略了 get/set 方法和注释以节省空间。
xjc -d generated http://www.kbcafe.com/rss/atom.xsd.xml
包裹信息
@XmlSchema(
namespace = "http://www.w3.org/2005/Atom",
elementFormDefault = XmlNsForm.QUALIFIED)
@XmlAccessorType(XmlAccessType.FIELD)
package org.w3._2005.atom;
import javax.xml.bind.annotation.*;
类别类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "categoryType")
public class CategoryType {
@XmlAttribute(required = true)
protected String term;
@XmlAttribute
@XmlSchemaType(name = "anyURI")
protected String scheme;
@XmlAttribute
protected String label;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
内容类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "contentType", propOrder = {"content"})
public class ContentType {
@XmlMixed
@XmlAnyElement(lax = true)
protected List<Object> content;
@XmlAttribute
protected String type;
@XmlAttribute
@XmlSchemaType(name = "anyURI")
protected String src;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
日期时间类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.datatype.XMLGregorianCalendar;
import javax.xml.namespace.QName;
@XmlType(name = "dateTimeType", propOrder = {"value"})
public class DateTimeType {
@XmlValue
@XmlSchemaType(name = "dateTime")
protected XMLGregorianCalendar value;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
条目类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "entryType", propOrder = {"authorOrCategoryOrContent"})
public class EntryType {
@XmlElementRefs({
@XmlElementRef(name = "id", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "rights", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "summary", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "title", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "author", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "source", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "updated", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "category", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "content", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "published", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "contributor", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "link", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class)
})
@XmlAnyElement(lax = true)
protected List<Object> authorOrCategoryOrContent;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
饲料类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "feedType", propOrder = {"authorOrCategoryOrContributor"})
public class FeedType {
@XmlElementRefs({
@XmlElementRef(name = "link", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "updated", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "category", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "rights", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "contributor", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "title", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "id", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "generator", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "icon", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "subtitle", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "author", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "entry", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "logo", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class)
})
@XmlAnyElement(lax = true)
protected List<Object> authorOrCategoryOrContributor;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
发电机类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "generatorType", propOrder = {"value"})
public class GeneratorType {
@XmlValue
protected String value;
@XmlAttribute
@XmlSchemaType(name = "anyURI")
protected String uri;
@XmlAttribute
protected String version;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
图标类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "iconType", propOrder = {"value"})
public class IconType {
@XmlValue
@XmlSchemaType(name = "anyURI")
protected String value;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
身份类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "idType", propOrder = {"value"})
public class IdType {
@XmlValue
@XmlSchemaType(name = "anyURI")
protected String value;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
链接类型
package org.w3._2005.atom;
import java.math.BigInteger;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "linkType", propOrder = {"content"})
public class LinkType {
@XmlValue
protected String content;
@XmlAttribute(required = true)
@XmlSchemaType(name = "anyURI")
protected String href;
@XmlAttribute
protected String rel;
@XmlAttribute
protected String type;
@XmlAttribute
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "NMTOKEN")
protected String hreflang;
@XmlAttribute
protected String title;
@XmlAttribute
@XmlSchemaType(name = "positiveInteger")
protected BigInteger length;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
标志类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "logoType", propOrder = {"value"})
public class LogoType {
@XmlValue
@XmlSchemaType(name = "anyURI")
protected String value;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
人物类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "personType", propOrder = {"nameOrUriOrEmail"})
public class PersonType {
@XmlElementRefs({
@XmlElementRef(name = "email", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "name", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "uri", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class)
})
@XmlAnyElement(lax = true)
protected List<Object> nameOrUriOrEmail;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
来源类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "sourceType", propOrder = {"authorOrCategoryOrContributor"})
public class SourceType {
@XmlElementRefs({
@XmlElementRef(name = "updated", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "category", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "subtitle", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "logo", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "generator", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "icon", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "title", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "id", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "author", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "contributor", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "link", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class),
@XmlElementRef(name = "rights", namespace = "http://www.w3.org/2005/Atom", type = JAXBElement.class)
})
@XmlAnyElement(lax = true)
protected List<Object> authorOrCategoryOrContributor;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
文本类型
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "textType", propOrder = {"content"})
public class TextType {
@XmlMixed
@XmlAnyElement(lax = true)
protected List<Object> content;
@XmlAttribute
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
protected String type;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
UriType
package org.w3._2005.atom;
import java.util.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import javax.xml.namespace.QName;
@XmlType(name = "uriType", propOrder = {"value"})
public class UriType {
@XmlValue
@XmlSchemaType(name = "anyURI")
protected String value;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlSchemaType(name = "anyURI")
protected String base;
@XmlAttribute(namespace = "http://www.w3.org/XML/1998/namespace")
@XmlJavaTypeAdapter(CollapsedStringAdapter.class)
@XmlSchemaType(name = "language")
protected String lang;
@XmlAnyAttribute
private Map<QName, String> otherAttributes = new HashMap<QName, String>();
}
关于java - 如何从 XSD 生成 JAXB 类?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11463231/