XStream解析XML学习一

今天看到在Android上面写的一个程序，解析xml使用的是XStream技术，以前没有听说过，今天来把它学习一下，对于简单的使用来说这个是比较简单的。这个例子是参照官网上面的例子写的：http://xstream.codehaus.org/tutorial.html

1.首先构造想要序列化的类

Person.java:

public class Person {
	private String firstname;
	private String lastname;
	private PhoneNumber phone;
	private PhoneNumber fax;
	// ... constructors and methods
	public Person(String firstname, String lastname) {
		super();
		this.firstname = firstname;
		this.lastname = lastname;
	}
	public void setPhone(PhoneNumber phoneNumber) {
		this.phone = phoneNumber;
	}
	public void setFax(PhoneNumber phoneNumber) {
		this.fax = phoneNumber;
	}
	@Override
	public String toString() {
		return "FirstName:" + firstname + ",LastName:" + lastname
				+ "phone.Code:" + phone.getCode() + "phone.Number:"
				+ phone.getNumber() + "fax:" + fax.getCode() + "fax.Number:"
				+ fax.getNumber();
	}
}

PhoneNumber.java:

public class PhoneNumber {
	private int code;
	private String number;
	// ... constructors and methods
	public PhoneNumber(int code, String number) {
		super();
		this.code = code;
		this.number = number;
	}
	public int getCode() {
		return code;
	}
	public String getNumber() {
		return number;
	}
}

2.初始化XStream并序列化和反序列化。

Stream xStream = new XStream();

你需要xstream-[version].jar and xpp3-[version].jar在classpath中。XPP3是一个非常快的XML拉式转换器工具。如果你不想包含这个依赖，你可以使用标准的JAXP DOM转换器来代替。

XStream xStream = new XStream(new DomDriver());//不需要XPP3库

这里要特别说明的是XStream xStream2=new XStream();这样会出错，使用原来的

public class XStreamTest {
	
	public static void main(String[] args) throws FileNotFoundException {
		//Initializing XStream
		XStream xStream=new XStream();
		xStream.alias("person", Person.class);
		xStream.alias("personnumber", PhoneNumber.class);
		
		//Serializing an object to XML
		Person joe = new Person("Joe", "Walnes");
		joe.setPhone(new PhoneNumber(123, "1234-456"));
		joe.setFax(new PhoneNumber(123, "9999-999"));
		FileOutputStream fileOutputStream=new FileOutputStream(new File("test.xml"));
		xStream.toXML(joe,fileOutputStream);
		
		//Deserializing an object back from XM
		XStream xStream2=new XStream();
		FileInputStream fileInputStream=new FileInputStream(new File("test.xml"));
		Person person=(Person)xStream.fromXML(fileInputStream);
		System.out.println(person.toString());
		
		
		
	}
}

看一下运行的结果：

test.xml:

<person>
  <firstname>Joe</firstname>
  <lastname>Walnes</lastname>
  <phone>
    <code>123</code>
    <number>1234-456</number>
  </phone>
  <fax>
    <code>123</code>
    <number>9999-999</number>
  </fax>
</person>

反序列化在控制台输出的结果：

FirstName:Joe,LastName:Walnesphone.Code:123phone.Number:1234-456fax:123fax.Number:9999-999