XML的操作——JAXB进行Java对象和XML之间的转换

JAXB(Java Architecture for XML Binding)是一种特殊的序列化/反序列化工具，可实现Java对象与XML的相互转换。

在JAXB中将一个Java对象——>XML的过程称之为Marshal，XML——>Java对象的过程称之为UnMarshal。
@XmlRootElement

public class SClass

{

private String cnum;

private List<Student> students;

public SClass()

{

super();

}

public SClass(String cnum, List<Student> students)

{

super();

this.cnum = cnum;

this.students = students;

}

public String getCnum()

{

return cnum;

}

public void setCnum(String cnum)

{

this.cnum = cnum;

}

public List<Student> getStudents()

{

return students;

}

public void setStudents(List<Student> students)

{

this.students = students;

}

}

public class Student

{

private String num;

private String name;

public Student()

{

super();

}

public Student(String num, String name)

{

super();

this.num = num;

this.name = name;

}

public String getNum()

{

return num;

}

public void setNum(String num)

{

this.num = num;

}

public String getName()

{

return name;

}

public void setName(String name)

{

this.name = name;

}

}

public class JaxbTest

{

@Test

public void test01() throws IOException

{

try

{

JAXBContext ctx = JAXBContext.newInstance(SClass.class);

Marshaller marshaller = ctx.createMarshaller();

List<Student> lstStudent = new ArrayList<Student>();

Student s1 = new Student("001", "xy");

Student s2 = new Student("002", "xy2");

lstStudent.add(s1);

lstStudent.add(s2);

SClass sclass = new SClass("c001", lstStudent);

// 生成的XML文件位置

String path = "D:/sclass.xml";

File file = new File(path);

if (!file.exists())

{

file.createNewFile();

}

// 编码格式

marshaller.setProperty(Marshaller.JAXB_ENCODING, "gb2312");

// 是否格式化生成的XML

marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

// 是否省略XML头信息<?xml version="1.0" encoding="gb2312" standalone="yes"?>

marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);

// 生成

marshaller.marshal(sclass, file);

}

catch (JAXBException e)

{

e.printStackTrace();

}

}

@Test

public void test02() throws Exception

{

try

{

String path = "D:/sclass.xml";

InputStream is = new FileInputStream(path);

String content = IOUtils.getString(is);

JAXBContext ctx = JAXBContext.newInstance(SClass.class);

Unmarshaller um = ctx.createUnmarshaller();

SClass sclass = (SClass) um.unmarshal(new StringReader(content));

System.out.println(sclass.getCnum());

System.out.println(sclass.getStudents().get(1).getName());

}

catch (JAXBException e)

{

e.printStackTrace();

}

}

}

test01 执行结果：对象——>XML，生成XML标签的顺序按照首字母的顺序

<sClass>

<cnum>c001</cnum>

<students>

<name>xy</name>

<num>001</num>

</students>

<students>

<name>xy2</name>

<num>002</num>

</students>

</sClass>

test02执行结果：

c001

xy2

IOUtils可以参考我的博客：http://blog.csdn.net/woshixuye/article/details/13613805