xml从入门到精通之xml文件和java文件的转化

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用到java自带的一个类 javax.xml.bind.JAXBContext; 这个类是总类，然后他创建两个类，一个是xml转java，一个是java转xml

注意转xml的时候，实体类要加上@XmlRootElement注释
student.java实体类

package xml_java;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElementpublic 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();    }}

classroom.java实体类

package xml_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();        // TODO Auto-generated constructor stub    }}

package xml_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 text {    //java转xml    @Test    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();        }    }    //xml转java    @Test    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();        }    }}

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