JAXB - Bean 到 XSD 或 XSD 到 Bean

使用JAXB（Java Architecture for XML Binding）可以实现Java Bean到XSD（XML Schema Definition）或XSD到Java Bean的转换。JAXB是一种Java技术，用于将Java类与XML文档进行绑定，使得可以在Java对象和XML之间进行无缝转换。这种转换在许多应用程序中非常有用，尤其是在处理XML数据时。本文将介绍如何使用JAXB进行Bean到XSD或XSD到Bean的转换，并提供相应的示例代码。

java
// Java类
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Book {
    private String title;
    private String author;
    // getter和setter方法
}
// XJC命令行工具
xjc Book.java

xml
    
    
        
            
            
        
    
xjc Book.xsd

java
// Java类
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Book {
    private String title;
    private String author;
    // getter和setter方法
}
// 将Java Bean转换为XSD
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.SchemaOutputResolver;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.io.IOException;
public class BeanToXSDExample {
    public static void main(String[] args) {
        try {
            JAXBContext context = JAXBContext.newInstance(Book.class);
            context.generateSchema(new SchemaOutputResolver() {
                @Override
                public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
                    File file = new File(suggestedFileName);
                    StreamResult result = new StreamResult(file);
                    result.setSystemId(file.toURI().toURL().toString());
                    return result;
                }
            });
        } catch (JAXBException | IOException e) {
            e.printStackTrace();
        }
    }
}
// 将XSD转换为Java Bean
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import java.io.File;
public class XSDToBeanExample {
    public static void main(String[] args) {
        try {
            File file = new File("Book.xml");
            JAXBContext context = JAXBContext.newInstance(Book.class);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            Book book = (Book) unmarshaller.unmarshal(file);
            System.out.println("Title: " + book.getTitle());
            System.out.println("Author: " + book.getAuthor());
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
}