java与xml之间的转换，jaxb

使用java提供的JAXB来实现java到xml之间的转换，先创建两个持久化的类（Student和Classroom）：

Classroom：

package com.model;

public class Classroom {
    private int id;
    private String name;
    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 Classroom(){
        super();
    }
    public Classroom(int id,String name){
        this.id = id;
        this.name = name;
    }
}

Student：

import javax.xml.bind.annotation.XmlRootElement;
//不要忘记了这个注解@XmlRootElement，说明将Student作为xml的根元素
@XmlRootElement
public class Student {
    private String name;
    private String sex;
    private int age;
    private Classroom classroom;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    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(){
        super();
    }
    public Student(String name,String sex,int age,Classroom classroom){
        super();
        this.age=age;
        this.classroom=classroom;
        this.name = name;
        this.sex = sex;
    }
}

下面可以建立我的main函数了,在此，我们用的是JAXBContext创建的marshaller与unmarshaller来解析java与xml

package test;

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 com.model.Classroom;
import com.model.Student;

public class Test {
    public static void main(String[] args) {
　　　　　//new Test().java_xml();　
new Test().xml_java();
    }
    public void java_xml(){
        try {
            JAXBContext jaxbc = JAXBContext.newInstance(Student.class);
            Marshaller marshaller = jaxbc.createMarshaller();
            Student stu = new Student("小瞧","男",22,new Classroom(12,"10级"));
            //marshaller.setProperty(marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(stu, System.out);
        } catch (JAXBException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public void xml_java(){
        String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" +
                "<student><age>22</age>" +
                "<classroom>" +
                    "<id>12</id>" +
                    "<name>10级</name>" +
                    "</classroom>" +
                "<name>小瞧</name>" +
                "<sex>男</sex>" +
                "</student>";
        try {
            JAXBContext jaxbc = JAXBContext.newInstance(Student.class);
            Unmarshaller unmar = jaxbc.createUnmarshaller();
            Student stu = (Student)unmar.unmarshal(new StringReader(xml));
            System.out.println(stu.getAge());
        } catch (JAXBException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}