JDK自带XML和java对象相互转换

下面使用的是JDK自带的类，没有引用任何第三方jar包。 Unmarshaller 类使客户端应用程序能够将 XML 数据转换为 Java 内容对象树。备注：marshal(序列化、排列、整理)Marshaller 类使客户端应用程序能够将 Java 内容树转换回 XML 数据。

package hb.jaxb;

import javax.xml.bind.annotation.XmlRootElement;
//1、需要转换的model对象一定要添加@XmlRootElement注解，其里面的其他对象(Classroom)则不需要
@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;
}

//无参够着函数一定需要，否则JXBContext无法正常解析。
public Student() {
super();
}
}

package hb.jaxb;
//2、需要转换的model对象一定要有不带参数的构造方法，包括该对象里面引用的对象。
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();
}

}

package hb.jaxb;

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;
//Eclipse console
//中文乱码解决 eclipse-->Run-->Run Configuration-->Common--> Console Encoding-->Others-->UTF-8
//参考博文：http://hbiao68.iteye.com/blog/1958413
public class TestJaxb {

@Test
public void beanToXML() {
Classroom classroom = new Classroom(1, "软件工程", 4);
Student student = new Student(101, "张三", 22, classroom);

try {
JAXBContext context = JAXBContext.newInstance(Student.class);
Marshaller marshaller = context.createMarshaller();
marshaller.marshal(student, System.out);
} catch (JAXBException e) {
e.printStackTrace();
}

}

@Test
public void XMLStringToBean(){
String xmlStr = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><student><age>22</age><classroom><grade>4</grade><id>1</id><name>软件工程</name></classroom><id>101</id><name>张三</name></student>";
try {
JAXBContext context = JAXBContext.newInstance(Student.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
Student student = (Student)unmarshaller.unmarshal(new StringReader(xmlStr));
System.out.println(student.getAge());
System.out.println(student.getClassroom().getName());
} catch (JAXBException e) {
e.printStackTrace();
}

}
}

参考博文：
http://hbiao68.iteye.com/blog/1958413