Java对象序列化操作详解

import java.io.*;
import java.util.Date;
public class ObjectSaver {
  public static void main(String[] args) throws Exception {
    /*其中的 D:\\objectFile.obj 表示存放序列化对象的文件*/
    //序列化对象
    ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("D:\\objectFile.obj"));
    Customer customer = new Customer("王麻子", 24);  
    out.writeObject("你好!");  //写入字面值常量
    out.writeObject(new Date());  //写入匿名Date对象
    out.writeObject(customer);  //写入customer对象
    out.close();
    //反序列化对象
    ObjectInputStream in = new ObjectInputStream(new FileInputStream("D:\\objectFile.obj"));
    System.out.println("obj1 " + (String) in.readObject());  //读取字面值常量
    System.out.println("obj2 " + (Date) in.readObject());  //读取匿名Date对象
    Customer obj3 = (Customer) in.readObject();  //读取customer对象
    System.out.println("obj3 " + obj3);
    in.close();
  }
}
class Customer implements Serializable {
  private String name;
  private int age;
  public Customer(String name, int age) {
    this.name = name;
    this.age = age;
  }
  public String toString() {
    return "name=" + name + ", age=" + age;
  }
}

public class Hello {
  public static void main(String[] args) throws Exception {
   File file = new File("E:" + File.separator + "myFile" + File.separator + "test" + File.separator + "123.txt");
   OutputStream outputStream = new FileOutputStream(file);
   PrintStream printStream = new PrintStream(outputStream);
   printStream.print(123);
   printStream.println("hello");
   printStream.println(12.5);
   printStream.close();
  }
}

public class Hello {
  public static void main(String[] args) throws Exception {
   InputStream in = System.in;
   byte[] data = new byte[100];
   System.out.println("输入数据：");
   int read = in.read(data);
   System.out.println(read);
   System.out.println(new String(data,0,read));
  }
}

public class Hello {
  public static void main(String[] args) throws Exception {
   Scanner scanner = new Scanner(new FileInputStream(new File("E:" + File.separator + "myFile" + File.separator + "test" + File.separator + "123.txt")));
   scanner.useDelimiter("\n");
   while (scanner.hasNext()){
     String next = scanner.next();
     System.out.println(next);
   }
   scanner.close();
  }
}

Scanner scanner = new Scanner(System.in);

public class Hello {
  public static void main(String[] args) throws Exception {
   A a = new A("hello", 123);
   File file = new File("E:" + File.separator + "myFile" + File.separator + "test" + File.separator + "a.ser");
   OutputStream outputStream = new FileOutputStream(file);
   ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
   objectOutputStream.writeObject(a);
   objectOutputStream.close();
  }
}
class A implements Serializable {
  private String title;
  private Integer number;
  public A(String title, Integer number) {
   this.title = title;
   this.number = number;
  }
  public String getTitle() {
   return title;
  }
  public void setTitle(String title) {
   this.title = title;
  }
  public Integer getNumber() {
   return number;
  }
  public void setNumber(Integer number) {
   this.number = number;
  }
  @Override
  public String toString() {
   return "A{" +
      "title='" + title + '\'' +
      ", number=" + number +
      '}';
  }
}

public class Hello {
  public static void main(String[] args) throws Exception {
   File file = new File("E:" + File.separator + "myFile" + File.separator + "test" + File.separator + "a.ser");
   InputStream inputStream = new FileInputStream(file);
   ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
   A a = (A) objectInputStream.readObject();
   System.out.println(a);
  }
}

private String title;
private transient Integer number;