Serializable and Deserialize

Serialization mechanism ： By using ObjectInputStream and ObjectOutputStream The mechanism by which classes save and read objects is called serialization mechanism
object (Object) serialize The process of converting an object into a sequence of bytes
Deserialization Is the process of restoring objects according to byte sequence
Keep objects permanently , Save the byte sequence of the object to the local file
Passing objects through the network by serializing them
Passing objects between processes through serialization
An object wants to be serialized , The corresponding class must implement the serialization interface （Serializable）

Entity class ：Student

package bean;

import java.io.Serializable;

/** 
* @author : htf 
* 
*  Entity class student object 
*/
public class Student implements Serializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private Integer Sid;
	private String  sName;
	private transient String  address;//transient Decorated properties cannot be serialized 
	
	
	public Student() {
	
	}
	public Student(Integer sid, String sName, String address) {
		super();
		Sid = sid;
		this.sName = sName;
		this.address = address;
	}
	
	public Integer getSid() {
		return Sid;
	}
	public void setSid(Integer sid) {
		Sid = sid;
	}
	public String getsName() {
		return sName;
	}
	public void setsName(String sName) {
		this.sName = sName;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	@Override
	public String toString() {
		return "Student [Sid=" + Sid + ", sName=" + sName + ", address=" + address + "]";
	}
	
	
}

Test class ：TestObjectSerial

package io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import bean.Student;

/** 
* @author : htf 
*  Simulate persisting objects to hard disk files 
*  Serialization of objects requires ： Implementation interface  Serializable
*/
public class TestObjectSerial {

	
	//Object--->String
	public static void test1() {
		// Instantiate objects 
		Student s1=new Student(1, "zhangsan", " Guangzhou ");
		File parent=new File("E:\\temp");
		// Read whether there is on the document 
		if(!parent.exists()) {
			parent.mkdir();// create a file 
		}
		File file =new File(parent,"student.txt");
		
		// Manage resources automatically 
		try(ObjectOutputStream os=new ObjectOutputStream(new FileOutputStream(file));){
			
			os.writeObject(s1);// stay e disc ,temp Folder ,student.txt   View yes     The result of serializing an object into bytes 
			
		}catch (Exception e) {
			e.printStackTrace();
		}
	}
	//String--->Object
	public static void test2() {

		File parent=new File("E:\\temp");
		if(!parent.exists()) {
			parent.mkdir();
		}
		File file =new File(parent,"student.txt");
		try(ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));){
			
			Student obj=(Student)ois.readObject();
			System.out.println(obj);//transient Decorated properties cannot be serialized 
			// Deserialize characters into objects   Student [Sid=1, sName=zhangsan, address=null]
			
		}catch (Exception e) {
			// TODO: handle exception
		}
	}
	public static void main(String[] args) {
		//test1();
		test2();
	}
}