Java FileInputStream和ObjectInputStream的区别用法及代码示例

// Java program to demonstrate Use of ObjectInputStream
// class
// Importing required input output classes
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
// Before serialization and de-serialization of objects the
// class of the object must implement java.io.Serializable
// Class 1
// Helper class implementing Serializable interface
class Student implements Serializable {
    // Private class member variables
    private static final long serialVersionUID
        = -1438960132000208485L;
    private String name;
    private int age;
    // Constructor of this class
    public Student(String name, int age)
    {
        // super keyword refers to parent class
        super();
        // this keyword refers to current object instance
        this.name = name;
        this.age = age;
    }
    // Getters and Setter for class
    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; }
    // Override toString method
    @Override public String toString()
    {
        // Simply return the name and age
        return "Student [name=" + name + ", age=" + age
            + "]";
    }
}
// Class 2
// Main class
public class ObjectInputStreamDemo {
    // Main driver method
    public static void main(String[] args)
        throws FileNotFoundException, IOException,
               ClassNotFoundException
    {
        // Creating an object of above class
        // in the main() method
        ObjectInputStreamDemo objectInputStreamDemo
            = new ObjectInputStreamDemo();
        // Readfile function call
        objectInputStreamDemo.readStudentObject();
    }
    // Member method of main class
    private void readStudentObject()
        throws IOException, FileNotFoundException,
               ClassNotFoundException
    {
        // Initially null is set to both streams
        // read and write streams
        FileInputStream fileInputStream = null;
        ObjectInputStream objectInputStream = null;
        // Try block to check for exceptions
        try {
            // Input stream directory
            fileInputStream
                = new FileInputStream("student.txt");
            // Input stream object
            objectInputStream
                = new ObjectInputStream(fileInputStream);
            // Creating an object of above class to
            // read an object from the ObjectInputStream
            Student student
                = (Student)objectInputStream.readObject();
            // Display message when input stream is
            // completely read
            System.out.println(
                "Successfully read student object from the file.");
            // Print an display commands
            System.out.println(student);
            System.out.println("Name = "
                               + student.getName());
            System.out.println("Age  = "
                               + student.getAge());
        }
        // When an exception is encountered execute the
        // block
        finally {
            // If there is nothing to be read
            if (objectInputStream != null) {
                // Then close a ObjectInputStream will
                //  the InputStream instance from which
                // the ObjectInputStream is reading
                // isong the close() method
                objectInputStream.close();
            }
        }
    }
}