如何使用 JAXB 返回 XML 文件

Question

我有一项学校作业，我需要使用 JAXB 框架来返回我机器上文件夹中的 xml。 我需要返回的 XML 文件夹是以下一个，我必须在 java 语言上进行。

<bookstore>
<book category="cooking">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="children">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="web">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="web" cover="paperback">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>

相信我，我试图通过观看大量教程和官方 oracle 文档来为我的工作找到答案，但我没有任何成功。

Answer 1

If you want to build a Java object in an XML string, obtain an instance of the JAXBContext class, for the use of the JAXB AP I since it provides methods to disarm, sort and validate operations. 然后获取JAXBContext的 Marshaller 实例。 The marshal() , method generates the Java object in XML, and then the XML object can be written to any ways. 例如：

import java.io.StringWriter;    
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class JAXBTest {

    public static void main(String[] args) {
        Book book = new Book("Everyday Italian", 2005);
        generateXML(book);
    }

    private static final void generateXML(Book book) {
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(Book.class);
            Marshaller marshaller = jaxbContext.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

            StringWriter stringWriter = new StringWriter();
            marshaller.marshal(book, stringWriter);
            System.out.println(stringWriter.toString());

        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
}

Output：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<book>
    <title>Everyday Italian</title>
    <year>2005</year>
</book>