java - 使用 XML 文件和生成的 JAXB 帮助器类将多个对象条目编码到一个文件中

Question

以及生成的 JAXB 帮助器类:

package itemOrder;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "title",
    "author",
    "publisher",
    "description",
    "price",
    "publicationYear"
})
@XmlRootElement(name = "book")
public class Book {

@XmlElement(name = "Title", required = true)
protected String title;
@XmlElement(name = "Author", required = true)
protected String author;
@XmlElement(name = "Publisher", required = true)
protected String publisher;
@XmlElement(name = "Description", required = true)
protected String description;
@XmlElement(name = "Price")
protected float price;
@XmlElement(name = "PublicationYear")
protected int publicationYear;
@XmlAttribute(name = "ISBN")
protected Integer isbn;

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

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

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

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

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

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

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

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

/**
 * Gets the value of the price property.
 * 
 */
public float getPrice() {
    return price;
}

/**
 * Sets the value of the price property.
 * 
 */
public void setPrice(float value) {
    this.price = value;
}

/**
 * Gets the value of the publicationYear property.
 * 
 */
public int getPublicationYear() {
    return publicationYear;
}

/**
 * Sets the value of the publicationYear property.
 * 
 */
public void setPublicationYear(int value) {
    this.publicationYear = value;
}

/**
 * Gets the value of the isbn property.
 * 
 * @return
 *     possible object is
 *     {@link Integer }
 *     
 */
public Integer getISBN() {
    return isbn;
}

/**
 * Sets the value of the isbn property.
 * 
 * @param value
 *     allowed object is
 *     {@link Integer }
 *     
 */
public void setISBN(Integer value) {
    this.isbn = value;
}

}

在 Main 中，我使用 XML 模板为定义的元素设置数据:

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;


public class Main {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    // TODO code application logic here
    itemOrder.Book quickXML = new itemOrder.Book();

    quickXML.setAuthor("Lev Tolstoi");
    quickXML.setDescription("Russion fixction about 1st world war");
    quickXML.setISBN(62129985);
    quickXML.setPrice((float)12.6);
    quickXML.setPublisher("Progress");
    quickXML.setTitle("War and Peace");
    try {            
        javax.xml.bind.JAXBContext jaxbCtx = javax.xml.bind.JAXBContext.newInstance(quickXML.getClass().getPackage().getName());
        javax.xml.bind.Marshaller marshaller = jaxbCtx.createMarshaller();
        marshaller.setProperty(javax.xml.bind.Marshaller.JAXB_ENCODING, "UTF-8"); //NOI18N
        marshaller.setProperty(javax.xml.bind.Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        OutputStream os = new FileOutputStream("xmlFile.xml");
        marshaller.marshal(quickXML, os);
    } catch (javax.xml.bind.JAXBException ex) {
        // XXXTODO Handle exception
        java.util.logging.Logger.getLogger("global").log(java.util.logging.Level.SEVERE, null, ex); //NOI18N
    } catch (FileNotFoundException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    }
}

}

然后将它们编码到文件中。问题是，如何将多个数据条目编码到一个文件中。例如:我想整理这个:

quickXML.setAuthor("Lev Tolstoi");
quickXML.setDescription("Russion fixction about 1st world war");
quickXML.setISBN(62129985);
quickXML.setPrice((float)12.6);
quickXML.setPublisher("Progress");
quickXML.setTitle("War and Peace");

还有这个:

quickXML.setAuthor("Robert Schwentke");
quickXML.setDescription("description description description");
quickXML.setISBN(62129432);
quickXML.setPrice((float)10.9);
quickXML.setPublisher("Regress");
quickXML.setTitle("Red");

同时，进入同一个文件。有什么想法吗？

Answer 1

您可以使用“books”标签包裹“book”元素

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://xml.netbeans.org/schema/books"
    xmlns:tns="http://xml.netbeans.org/schema/books"
    elementFormDefault="qualified">
    <xsd:element name="books">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="book">
                    <xsd:element name="Title" type="xsd:string"/>
                    <xsd:element name="Author" type="xsd:string"/>
                    <xsd:element name="Publisher" type="xsd:string"/>
                    <xsd:element name="Description" type="xsd:string"/>
                    <xsd:element name="Price" type="xsd:float"/>
                    <xsd:element name="PublicationYear" type="xsd:int"/>
                <xsd:element name="book">
            </xsd:sequence>
            <xsd:attribute name="ISBN" type="xsd:int"/>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>