jAXB学习 （一）入门
这样就算安装成功了。
?
二、生成模型
?
安装完以后，就可以开始使用了，首先我们需要有一份schema文件，例如：
<?xml version="1.0" encoding="UTF-8"?><schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://www.liulutu.com/students/" targetNamespace="http://www.liulutu.com/students/"> <element name="students"> <complexType> <sequence> <element name="student" type="tns:StudentType" maxOccurs="unbounded" /> </sequence> </complexType> </element> <simpleType name="SexType"> <restriction base="string"> <enumeration value="Male"></enumeration> <enumeration value="Female"></enumeration> </restriction> </simpleType> <complexType name="StudentType"> <attribute name="sex" type="tns:SexType"></attribute> <attribute name="name" type="string"></attribute> </complexType></schema>
?
?
然后就可以根据这个schema文件生成对应的java模型类文件，可以到jaxb的bin目录下去，使用以下命令生成模型文件：xjc.bat?students.xsd?-d?src?-p?com.liulutu.student.model?
?
三、使用
?
有了以上模型文件后，就可以开始使用，例如
模型到XML
public class TestMarshaller { public static void main(String[] args) throws JAXBException { JAXBContext con = JAXBContext.newInstance("com.liulutu.student.model"); ObjectFactory factory = new ObjectFactory(); Students students = factory.createStudents(); addNewStudentTo(factory, students, "aaa", SexType.MALE); addNewStudentTo(factory, students, "bbb", SexType.FEMALE); Marshaller marshaller = con.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(students, new File("a.xml")); } private static void addNewStudentTo(ObjectFactory factory, Students students, String name, SexType type) { StudentType studentType = factory.createStudentType(); studentType.setName(name); studentType.setSex(type); students.getStudent().add(studentType); }}?
保存后的xml文件内容如下：
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><ns2:students xmlns:ns2="http://www.liulutu.com/students/"> <student name="aaa" sex="Male"/> <student name="bbb" sex="Female"/></ns2:students>
?
?XML到模型
?以下代码用来还原以上保存的XML文件对应的模型（假如保存的文件名为a.xml）：
public class TestUnmarshaller { public static void main(String[] args) throws JAXBException { JAXBContext con = JAXBContext.newInstance("com.liulutu.student.model"); Unmarshaller unmarshaller = con.createUnmarshaller(); Students students = (Students) unmarshaller.unmarshal(new File("a.xml")); List<StudentType> student = students.getStudent(); Iterator<StudentType> iterator = student.iterator(); while(iterator.hasNext()){ StudentType next = iterator.next(); System.out.println(next.getName()+" "+next.getSex()); } }}?
?
?