屬性別名(Attribute Aliasing)

屬性別名用于將成員變量序列化為XML屬性。 讓我們再次修改我們的示例并將以下代碼添加到其中。xstream.useAttributeFor(Student.class, "studentName");

xstream.aliasField("name", Student.class, "studentName");

讓我們使用XStream測試上面對象的序列化。

在C:\》XStream_WORKSPACE\com\iowiki\xstream創建名為XStreamTester的java類文件。

File: XStreamTester.javapackage com.iowiki.xstream;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.util.ArrayList;

import java.util.List;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Source;

import javax.xml.transform.Transformer;

import javax.xml.transform.sax.SAXSource;

import javax.xml.transform.sax.SAXTransformerFactory;

import javax.xml.transform.stream.StreamResult;

import org.xml.sax.InputSource;

import com.thoughtworks.xstream.XStream;

import com.thoughtworks.xstream.io.xml.StaxDriver;

public class XStreamTester {

public static void main(String args[]) {

XStreamTester tester = new XStreamTester();

XStream xstream = new XStream(new StaxDriver());

xstream.alias("student", Student.class);

xstream.alias("note", Note.class);

xstream.useAttributeFor(Student.class, "studentName");

xstream.aliasField("name", Student.class, "studentName");

xstream.addImplicitCollection(Student.class, "notes");

Student student = tester.getStudentDetails();

//Object to XML Conversion

String xml = xstream.toXML(student);

System.out.println(formatXml(xml));

}

private Student getStudentDetails() {

Student student = new Student("Mahesh");

student.addNote(new Note("first","My first assignment."));

student.addNote(new Note("second","My Second assignment."));

return student;

}

public static String formatXml(String xml) {

try {

Transformer serializer = SAXTransformerFactory.newInstance().newTransformer();

serializer.setOutputProperty(OutputKeys.INDENT, "yes");

serializer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

Source xmlSource = new SAXSource(new InputSource(

new ByteArrayInputStream(xml.getBytes())));

StreamResult res = new StreamResult(new ByteArrayOutputStream());

serializer.transform(xmlSource, res);

return new String(((ByteArrayOutputStream)res.getOutputStream()).toByteArray());

} catch(Exception e) {

return xml;

}

}

}

class Student {

private String studentName;

private List notes = new ArrayList();

public Student(String name) {

this.studentName = name;

}

public void addNote(Note note) {

notes.add(note);

}

public String getName() {

return studentName;

}

public List getNotes() {

return notes;

}

}

class Note {

private String title;

private String description;

public Note(String title, String description) {

this.title = title;

this.description = description;

}

public String getTitle() {

return title;

}

public String getDescription() {

return description;

}

}

驗證結果

使用javac編譯器編譯類如下 -C:\XStream_WORKSPACE\com\iowiki\xstream>javac XStreamTester.java

現在運行XStreamTester來查看結果 -C:\XStream_WORKSPACE\com\iowiki\xstream>java XStreamTester

驗證輸出如下 -<?xml version = "1.0" encoding = "UTF-8"?>

first

My first assignment.

second

My Second assignment.

總結

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