通过实例了解java序列化机制

package stream;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import javax.security.auth.login.AccountException;

import org.junit.jupiter.api.Test;

/*
 * 对象流
 *   用与存储和读取基本数据类型数据 或 对象的处理刘。它的强大之处就是可以把java中的对象转换成流
 * 
 * */

public class ObjectInputStreamTeat {
  /*
   * 序列化过程：将内存中的java对象保存到磁盘或通过网络传输出去
   * 使用ObjectOutputStream 
   * */
  @Test
  public void testObjectOutputStream() {
    ObjectOutputStream oos = null;
    try {
      oos = new ObjectOutputStream(new FileOutputStream("Object.dat"));
      oos.writeObject(new String("我是中国人"));
      oos.flush();
      
      oos.writeObject(new Person("zsben",1,new Account(2000)));
      oos.flush();
      
    } catch (Exception e) {
      e.printStackTrace();
    }
    finally {
      try {
        if(oos!=null)
          oos.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
  
  /*
   * 反序列化:用ObjectInputStream实现
   * */
  @Test
  public void testObjectInputStream() {
    ObjectInputStream ois = null;
    try {
      ois = new ObjectInputStream(new FileInputStream("Object.dat"));
      Object object = ois.readObject();
      String string = (String)object;
      System.out.println(string);
      
      Object object2 = ois.readObject();
      Person person = (Person)object2;
      System.out.println(person);
      
    } catch (Exception e) {
      e.printStackTrace();
    }
    finally {
      try {
        if(ois!=null)
          ois.close();
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
}
/*
 * 1.Person类要实现可序列化，必须实现可序列化接口Serializable
 * 2.还需要添加一个最终类属性UID
 * 3.除了当前Person类需要实现Serializable，还要保证其内部所有属性都是可序列化的
 *   (默认情况下基本数据类型为可序列化)
 * 对象流不能序列化static 和transient修饰的成员
 * */
class Person implements Serializable{
  public static final long serivalVersionUID = 5432146546351568416L;
  
  private String name;
  private static int age;
  private Account account; 
  @Override
  public String toString() {
    return "Person [name=" + name + ", age=" + age + ", account=" + account + "]";
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public Person(String name, int age) {
    super();
    this.name = name;
    this.age = age;
  }
  
  public Person(String name, int age, Account account) {
    super();
    this.name = name;
    this.age = age;
    this.account = account;
  }
  public Person() {
    super();
  }  
}
class Account implements Serializable{
  private double balance;
  static final public long serivalVersionUID = 54685237864535874L;
  @Override
  public String toString() {
    return "Account [balance=" + balance + "]";
  }

  public double getBalance() {
    return balance;
  }

  public void setBalance(double balance) {
    this.balance = balance;
  }

  public Account(double balance) {
    super();
    this.balance = balance;
  }

  public Account() {
    super();
  }
}