XStream混疊

混疊是一種技術來定製生成XML或者使用XStream特定的格式化XML。假設,一個下面的XML格式是用於序列化/反序列化Student對象。

<student name="Suresh"> first My first assignment. second My second assignment.

根椐上面的XML格式,讓我們創建的模型類。

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; } }

我們使用 XStream 測試上述對象序列化。

創建一個Java類名爲XStreamTester在文件 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()); 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

<com.yiibai.xstream.Student> Mahesh <com.yiibai.xstream.Note> first My first assignment. </com.yiibai.xstream.Note> <com.yiibai.xstream.Note> second My Second assignment. </com.yiibai.xstream.Note> </com.yiibai.xstream.Student>

在上面的結果,我們已經看到了Student對象名稱是完全合格的。要替換它作爲學生的標籤,按照下面的鏈接。

類混疊

另外,在上述結果中可以看出,所需studentName要重命名來命名。要取代它,按照下面的鏈接。

字段混疊

在上面的結果,我們可以看到,筆記標記被添加成爲筆記列表。替換它,按照下面的鏈接。

隱式集合混疊

在上面的結果,我們可以看到這個名字來作爲一個子節點,需要將它作爲根節點的屬性。替換它,按照下面的鏈接。

屬性混疊

包混疊