JAXB XML 验证机制解析：1.0 与 2.0 版本的关键差异

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

public class Jaxb1ValidationExample {
    public static void main(String[] args) {
        try {
            // 假设 packageName 是你的 JAXB 上下文包名
            JAXBContext jaxbContext = JAXBContext.newInstance("com.example.jaxb1");
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

            // 启用验证
            unmarshaller.setValidating(true); 

            // 之后进行 unmarshal 操作，JAXB 会尝试验证 XML
            // ... unmarshaller.unmarshal(xmlSource);

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

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.XMLConstants;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import java.io.File;

public class Jaxb2ValidationExample {
    public static void main(String[] args) {
        try {
            // 假设 packageName 是你的 JAXB 上下文包名
            JAXBContext jaxbContext = JAXBContext.newInstance("com.example.jaxb2");
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

            // 1. 创建 SchemaFactory
            SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

            // 2. 加载 XSD 文件，创建 Schema 对象
            // 假设 "your_schema.xsd" 在类路径或文件系统中
            File schemaFile = new File("your_schema.xsd"); 
            Schema schema = schemaFactory.newSchema(schemaFile);

            // 3. 将 Schema 对象设置给 Unmarshaller
            unmarshaller.setSchema(schema);

            // 之后进行 unmarshal 操作，JAXB 将根据提供的 XSD 验证 XML
            // ... unmarshaller.unmarshal(xmlSource);

        } catch (JAXBException | org.xml.sax.SAXException e) {
            e.printStackTrace();
        }
    }
}

import javax.xml.bind.Unmarshaller;
// ... 其他必要的导入

public class Jaxb2DynamicValidationControl {
    public static void main(String[] args) {
        try {
            JAXBContext jaxbContext = JAXBContext.newInstance("com.example.jaxb2");
            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();

            // 假设之前已经设置了 Schema 启用了验证
            // SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            // Schema schema = schemaFactory.newSchema(new File("your_schema.xsd"));
            // unmarshaller.setSchema(schema);

            // ... 执行一些需要验证的 unmarshal 操作

            // 动态关闭验证：将 Schema 设置为 null
            unmarshaller.setSchema(null); 

            // 之后进行 unmarshal 操作将不再执行 XML 验证
            // ... unmarshaller.unmarshal(anotherXmlSource);

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