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J2SE中的序列化的认识_MySQL

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Release: 2016-06-01 14:11:06
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J2SE

  java中处处体现着简单的程序设计风格,序列化作为最常用的功能之一,在java中的设计尤为“简单”。在ObjectInputStream 和ObjectOutputStream的帮助下,我们可以轻松的实现序列化。

  只要我们的class 实现了java.io.Serializable接口,就可以利用ObjectOutputStream的writeObject()方法将一个对象序列化;利用ObjectInputStream的readObject()方法,可以返回读出的object对象。Serializable接口不需要我们实现任何方法。

  以下是一个例子,它能给我们一个感性的认识:

  Serial实现了就java.io.Serializable接口,是需要序列化的类。我们首先构造一个Serial的对象serial1然后将其保存(序列化)在一个文件中,而后再将其读出(反序列化),并打印其内容。

  package Stream;

  /**

  * @author favo yang

  */

  import java.io.*;

  public class Serial implements Serializable {
  int company_id;
  String company_addr;
  boolean company_flag;
  public Serial(){}//不同于c++,没有也可以
  public Serial(int company_id,String company_addr,boolean company_flag) {
  this.company_id=company_id;
  this.company_addr=company_addr;
  this.company_flag=company_flag;
  }

  public static void main(String[] args) {
  Serial serial1 = new Serial(752,"dayer street #5 building 02-287",false);//构造一个新的对象
  FileInputStream in=null;
  FileOutputStream out=null;
  ObjectInputStream oin=null;
  ObjectOutputStream oout=null;

  try {
   out = new FileOutputStream("5.txt");
   oout = new ObjectOutputStream(out);
   serial1.serialize(oout);//序列化
   oout.close();
   oout=null;
   in = new FileInputStream("5.txt");
   oin = new ObjectInputStream(in);
   Serial serial2 = Serial.deserialize(oin);//反序列化
   System.out.println(serial2);//打印结果
  } catch (Exception ex){
   ex.printStackTrace();
  } finally{
   try {
    if (in != null) {
     in.close();
    }
    if (oin != null) {
     oin.close();
    }
    if (out != null) {
     out.close();
    }
    if (oout != null) {
     oout.close();
    }
   } catch (IOException ex1) {
    ex1.printStackTrace();
   }
  }
  }

  /**
  * deserialize
  */

  public static Serial deserialize(ObjectInputStream oin) throws Exception{
  Serial s=(Serial)oin.readObject();
  return s;
  }

  public String toString() {
  return "DATA: "+company_id+" "+company_addr+" "+company_flag;
  }

  /**
  * serialize
  */

  public void serialize(ObjectOutputStream oout) throws Exception{
  oout.writeObject(this);
  }
  }

  运行结果:

  DATA: 752 dayer street #5 building 02-287 false
  
  正确打印了结果。

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