1. WIKI教程
2. 学习XStream
3. XStream - 对象流( Object Streams)

XStream - 对象流( Object Streams)

XStream提供了java.io.ObjectInputStream和java.io.ObjectOutputStream的替代实现，以便可以从XML序列化或反序列化对象流。 当要处理大型对象集时，这一点特别有用，一次将一个对象保留在内存中。

Syntax: createObjectOutputStream()

ObjectOutputStream objectOutputStream = xstream.createObjectOutputStream(
   new FileOutputStream("test.txt"));

Syntax: createObjectInputStream()

ObjectInputStream objectInputStream = xstream.createObjectInputStream(
   new FileInputStream("test.txt"));

现在让我们在XStream中使用对象流测试代码。

在C:\> XStream_WORKSPACE\com\iowiki\xstream中创建名为XStreamTester的java类文件。

File: XStreamTester.java

package com.iowiki.xstream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;
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.autodetectAnnotations(true);
      Student student1 = new Student("Mahesh","Parashar");
      Student student2 = new Student("Suresh","Kalra");
      Student student3 = new Student("Ramesh","Kumar");
      Student student4 = new Student("Naresh","Sharma");
      try {
         ObjectOutputStream objectOutputStream = xstream.createObjectOutputStream(
            new FileOutputStream("test.txt"));
         objectOutputStream.writeObject(student1);
         objectOutputStream.writeObject(student2);
         objectOutputStream.writeObject(student3);
         objectOutputStream.writeObject(student4);
         objectOutputStream.writeObject("Hello World");
         objectOutputStream.close();
         ObjectInputStream objectInputStream = xstream.createObjectInputStream(
            new FileInputStream("test.txt"));
         Student student5 = (Student)objectInputStream.readObject();
         Student student6 = (Student)objectInputStream.readObject();
         Student student7 = (Student)objectInputStream.readObject();
         Student student8 = (Student)objectInputStream.readObject();
         String text = (String)objectInputStream.readObject();
         System.out.println(student5);
         System.out.println(student6);
         System.out.println(student7);
         System.out.println(student8);
         System.out.println(text);
      } catch (IOException e) {
         e.printStackTrace();
      } catch (ClassNotFoundException e) {
         e.printStackTrace();
      }
   }
}
@XStreamAlias("student")
class Student {
   private String firstName;
   private String lastName;
   public Student(String firstName, String lastName) {
      this.firstName = firstName;
      this.lastName = lastName;
   }
   public String getFirstName() {
      return firstName;
   }
   public String getLastName() {
      return lastName;
   }   
   public String toString() {
      return "Student [ firstName: "+firstName+", lastName: "+ lastName+ " ]";
   }	
}

验证结果 (Verify the Result)

使用javac编译器编译类如下 -

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

现在运行XStreamTester来查看结果 -

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

验证输出如下 -

Student [ firstName: Mahesh, lastName: Parashar ]
Student [ firstName: Suresh, lastName: Kalra ]
Student [ firstName: Ramesh, lastName: Kumar ]
Student [ firstName: Naresh, lastName: Sharma ]
Hello World

查看C:\》XStream_WORKSPACE\com\iowiki\xstream文件夹中的test.txt的内容。

<?xml version = "1.0" ?>
<object-stream>
   <student>
      <firstName>Mahesh</firstName>
      <lastName>Parashar</lastName>
   </student>
   <student>
      <firstName>Suresh</firstName>
      <lastName>Kalra</lastName>
   </student>
   <student>
      <firstName>Ramesh</firstName>
      <lastName>Kumar</lastName>
   </student>
   <student>
      <firstName>Naresh</firstName>
      <lastName>Sharma</lastName>
   </student>
   <string>Hello World</string>
</object-stream>