使用JDK自带的JAXB进行类和xml的互转

Classroom.java

public class Classroom {
    private int id;
    private String name;
    private int grade;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getGrade() {
        return grade;
    }
    public void setGrade(int grade) {
        this.grade = grade;
    }
    public Classroom(int id, String name, int grade) {
        super();
        this.id = id;
        this.name = name;
        this.grade = grade;
    }
    public Classroom() {
        super();
    }
}

Student.java

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Student {
    private int id;
    private String name;
    private int age;
    private Classroom classroom;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Classroom getClassroom() {
        return classroom;
    }
    public void setClassroom(Classroom classroom) {
        this.classroom = classroom;
    }
    public Student(int id, String name, int age, Classroom classroom) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
        this.classroom = classroom;
    }
    public Student() {
        super();
    }    
}

测试类:TestJaxb.java

import java.io.StringReader;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import org.junit.Test;

public class TestJaxb {

    @Test
    /**
     * 将java对象转成xml
     */
    public void test01() {
        try {
            JAXBContext ctx = JAXBContext.newInstance(Student.class);
            Marshaller marshaller = ctx.createMarshaller();
            Student stu = new Student(1,"张三",21,new Classroom(1,"10计算机应用技术",2010));
            marshaller.marshal(stu, System.out);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
    
    @Test
    /**
     * 将xml转成java对象
     */
    public void test02() {
        try {
            String xml = "<?xml version="1.0" encoding="UTF-8" standalone="yes"?><student><age>21</age><classroom><grade>2010</grade><id>1</id><name>10计算机应用技术</name></classroom><id>1</id><name>张三</name></student>";
            JAXBContext ctx = JAXBContext.newInstance(Student.class);
            Unmarshaller um = ctx.createUnmarshaller();
            Student stu = (Student)um.unmarshal(new StringReader(xml));
            System.out.println(stu.getName()+","+stu.getClassroom().getName());
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        
    }
}