XStream屬性混疊
屬性混疊用於創建一個成員變量作爲XML屬性序列化。再次修改我們的例子，下面的代碼添加到它。
xstream.useAttributeFor(Student.class, "studentName"); xstream.aliasField("name", Student.class, "studentName");
讓我們使用XStream測試上述對象序列化。
創建一個Java類名爲XStreamTester文件在C:\>XStream_WORKSPACE\com\yiibai\xstream.
File: XStreamTester.java
package com.yiibai.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<Note> notes = new ArrayList<Note>(); public Student(String name) { this.studentName = name; } public void addNote(Note note) { notes.add(note); } public String getName(){ return studentName; } public List<Note> 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編譯器編譯如下類：
C:\XStream_WORKSPACE\com\yiibai\xstream>javac XStreamTester.java
現在運行XStreamTester看到的結果：
C:\XStream_WORKSPACE\com\yiibai\xstream>java XStreamTester
驗證輸出
<student name="Mahesh">