XStream对象流 - XStream教程

XStream提供java.io.ObjectInputStream和java.io.ObjectOutputStream替代实现，使对象流可以被序列化或XML序列化。当大对象集要被处理，保持在存储器中的一个对象，这是特别有用的。

语法 : createObjectOutputStream()

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

语法 :createObjectInputStream()

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

现在，让我们用XStream对象流测试代码。

创建一个Java类名为XStreamTester文件在 C:\>XStream_WORKSPACE\com\yiibai\xstream.

File: XStreamTester.java

package com.yiibai.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

使用javac编译器编译如下类：

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

现在运行XStreamTester看到的结果：

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

验证输出

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

查看test.txt的内容在C:\>XStream_WORKSPACE\com\yiibai\xstream 文件夹。

<?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>