Example analysis of java serialization and deserialization operations
- 2020-05-12 02:38:41
- OfStack
This article illustrates the serialization and deserialization operations of java. I will share it with you for your reference as follows:
Summary:
Java serialization is the process of converting Java objects into byte sequences. Java deserialization is the process of restoring a sequence of bytes to an Java object.
Sample code:
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 java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
try {
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("D:/objectFile.obj"));
Customer customer = new Customer(" The Chinese ",23);
out.writeObject(" hello !");
out.writeObject(new Date());
out.writeObject(customer);
out.writeInt(123);
List list = new ArrayList();
int i =0 ;
while(i<100) {
Customer customer2 = new Customer(" The Chinese ",i);
list.add(customer2);
i++;
}
HashMap hashMap = new HashMap();
hashMap.put("customer", list);
out.writeObject(hashMap);
out.close();
ObjectInputStream in = new ObjectInputStream(new FileInputStream("D:/objectFile.obj"));
System.out.println("obj1= " + (String) in.readObject());
System.out.println("obj2= " + (Date) in.readObject());
Customer obj3 = (Customer) in.readObject();
System.out.println("obj3= " + obj3);
int obj4 = in.readInt();
System.out.println("obj4= " + obj4);
Object obj5 = in.readObject();
System.out.println(obj5);
HashMap hash_map = (HashMap)obj5;
List l = (List) hash_map.get("customer");
System.out.println("size: " + l.size());
for(int ii=0; ii<l.size() -1 ; ii++) {
Customer c = (Customer)l.get(ii);
System.out.println(c.getName());
System.out.println(c.getAge());
}
in.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
class Customer implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
private int age;
public String getName() {
return name;
}
public int getAge() {
return age;
}
public Customer(String name, int age) {
this.name = name;
this.age = age;
}
public String toString() {
return "name=" + name + ", age=" + age;
}
}
I hope this article has been helpful to you in java programming.