XML - JAXB示例

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一、简介

JAXB 即 Java Architecture for XML Binding，它提供一个绑定的编译器和一个运行时框架用来支持 XML 和 Java 对象的双向映射。

二、示例

1、marshaller

代码：

JAXBContext ctx = JAXBContext.newInstance(User.class);Marshaller marshaller = ctx.createMarshaller();User user = new User(1, "admin", new Role(1, "System", "System Management"));marshaller.marshal(user, System.out);

结果：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user><id>1</id><name>admin</name><role><id>1</id><name>System</name><note>System Management</note></role></user>

2、unmarshaller

代码：

JAXBContext ctx = JAXBContext.newInstance(User.class);Unmarshaller unmarshaller = ctx.createUnmarshaller();String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" + "<user>" +"<id>1</id>" +"<name>admin</name>" +"<role>" +"<id>1</id>" +"<name>System</name>" +"<note>System Management</note>" +"</role>" +"</user>"; User user  = (User) unmarshaller.unmarshal(new StringReader(xml));System.out.println(user);

结果：

    User [id=1, name=admin, role=Role [id=1, name=System, note=System Management]]

三、附录

import javax.xml.bind.annotation.XmlRootElement;/** * 实体， 需注解@XmlRootElement，否则异常javax.xml.bind.MarshalException */@XmlRootElementpublic class User {private int id;private String name;private Role role;    /** getter and setter **/}

public class Role {private int id;private String name;private String note;    /** getter and setter **/}

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