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如何从 XSD 生成 JAXB 类？

java jakarta-ee jaxb
2022-08-31 08:27:52

我是一个完全的XML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，我们手动为 XML 编写了模型代码。

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 生成类的信息。我们确实有一个 XSD。

我的问题：

1.） 我已经阅读了关于 XJC 的信息，在哪里可以找到它？

2.） 我们是否必须安装整个 JAXB？（那么到目前为止我们用了什么？这不是JAXB吗？


答案 1

XJC 包含在 JDK 的 bin 目录中，从 Java SE 6 开始。有关示例，请参阅：

博客的内容如下：

使用 JAXB 处理原子馈送Atom 是一种用于表示 Web 源的 XML 格式。标准格式允许读卡器应用程序显示来自不同来源的馈送。在此示例中，我们将处理此博客的 Atom 源。

演示

在此示例中，我们将使用 JAXB 将与此博客对应的 Atom XML 源转换为对象，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);
    }

}

型号

以下模型是由 Java 编译器 （XJC） 的模式生成的。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

软件包信息

@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>();
}

标识类型

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>();
}

标识

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>();
}

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>();
}

尿型

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 = "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>();
}

答案 2

对于Eclipse STS（至少3.5），你不需要安装任何东西。右键单击 schema.xsd -> 生成 -> JAXB 类。您必须在下一步中指定包和位置，仅此而已，应该生成您的类。我想上面提到的所有解决方案都有效，但这似乎是迄今为止最简单的（对于STS用户）。

[更新]Eclipse STS版本3.6（基于开普勒）具有相同的功能。

blah


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