xStream - 别名

• 

  简述

  Mooasing 是一种自定义生成的 XML 或使用 XStream 使用特定格式的 XML 的技术。假设以下 XML 格式将用于序列化/反序列化 Student 对象。

  
  <student name = "Suresh">
     <note>
        <title>first</title>
        <description>My first assignment.</description>
     </note>
     
     <note>
        <title>second</title>
        <description>My second assignment.</description>
     </note>
  </student>
  

  基于上述 XML 格式，让我们创建模型类。

  
  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;
     }     
  }
  

  让我们使用 XStream 测试上述对象序列化。

  在 C:\>XStream_WORKSPACE\com\jc2182\xstream 中创建一个名为 XStreamTester 的 java 类文件。

  File: XStreamTester.java

  
  package com.jc2182.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;
     }     
  }
  

  Verify the Result

  使用编译类 javac 编译器如下 -

  
  C:\XStream_WORKSPACE\com\jc2182\xstream>javac XStreamTester.java
  

  现在运行 XStreamTester 以查看结果 -

  
  C:\XStream_WORKSPACE\com\jc2182\xstream>java XStreamTester
  

  验证输出如下 -

  
  <?xml version = "1.0" encoding = "UTF-8"?>
  <com.jc2182.xstream.Student>
     <studentName>Mahesh</studentName>
     <notes>
        <com.jc2182.xstream.Note>
           <title>first</title>
           <description>My first assignment.</description>
        </com.jc2182.xstream.Note>
        
        <com.jc2182.xstream.Note>
           <title>second</title>
           <description>My Second assignment.</description>
       </com.jc2182.xstream.Note>
     </notes>
  </com.jc2182.xstream.Student>