Simple example of serialization and deserialization in Java

Serialization and deserialization refer to the mutual conversion of Java objects and byte sequences. They are generally used when saving or transmitting byte sequences. Here are two simple examples of serialization and deserialization in Java. , but let’s take a look at the specific concepts of sequence and deserialization first:

1.Java serialization and deserialization

Java serialization refers to converting Java objects into byte sequences The process; and Java deserialization refers to the process of restoring a byte sequence into a Java object.

2. Why serialization and deserialization are needed

We know that when two processes communicate remotely, they can send various types of data to each other, including text, pictures, audio, Video, etc., and these data will be transmitted on the network in the form of binary sequences. So when two Java processes communicate, can object transfer between processes be achieved? The answer is yes. How to do it? This requires Java serialization and deserialization. In other words, on the one hand, the sender needs to convert the Java object into a byte sequence and then transmit it over the network; on the other hand, the receiver needs to recover the Java object from the byte sequence.

When we understand why Java serialization and deserialization are needed, we will naturally think about the benefits of Java serialization. The first advantage is that it achieves the persistence of data. Through serialization, the data can be permanently saved to the hard disk (usually stored in a file). The second is that serialization is used to achieve remote communication, that is, the bytes of the object are transmitted over the network. sequence.

3. Example:

(1) Serialization and deserialization file:

import java.io.*; 
  
@SuppressWarnings("serial") 
class Person implements Serializable { 
  
  public Person(String name, String sex, int age, int height) { 
    this.name = name; 
    this.sex = sex; 
    this.age = age; 
    this.height = height; 
  } 
  
  public String toString() { 
    return "|" + this.name + "|" + this.sex + "|" + this.age + "|"
        + this.height + "|"; 
  } 
  
  public String name; 
  public String sex; 
  public int age; 
  public int height; 
} 
  
public class SerialTest { 
  public static void main(String[] args) throws FileNotFoundException, 
      IOException, ClassNotFoundException { 
  
    Person p = new Person("Jim", "male", 28, 194); 
  
    // 开始序列化 
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream( 
        new File("myTest.txt"))); 
    oos.writeObject(p); 
  
    // 反序列化 
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream( 
        new File("myTest.txt"))); 
    Person p1 = (Person) ois.readObject(); 
  
    System.out.println(p1.toString()); 
  } 
}

(2) XML deserialization into class:

import java.io.*; 
import com.thoughtworks.xstream.XStream; 
import com.thoughtworks.xstream.io.xml.DomDriver; 
  
  
@SuppressWarnings("serial") 
class RoadInfo implements Serializable { 
  
  public int id; 
  public long MDN; 
  public String NAME; 
  public double LNG; 
  public double LAT; 
  public String ICON; 
  
} 
  
@SuppressWarnings("serial") 
class table_list implements Serializable { 
  
  public String toString() { 
    StringBuffer sb = new StringBuffer(); 
    for (RoadInfo r : sequence) { 
      sb.append("|"); 
      sb.append(r.id); 
      sb.append("|"); 
      sb.append(r.MDN); 
      sb.append("|"); 
      sb.append(r.NAME); 
      sb.append("|"); 
      sb.append(r.LNG); 
      sb.append("|"); 
      sb.append(r.LAT); 
      sb.append("|"); 
      sb.append(r.ICON); 
      sb.append("|\n"); 
    } 
    return sb.toString(); 
  } 
  
  public table_list(int count) { 
    sequence = new RoadInfo[count]; 
    for (int i = 0; i < count; i++) { 
      sequence[i] = new RoadInfo(); 
    } 
  } 
  
  public RoadInfo[] sequence; 
} 
  
public class XMLTest { 
  
  /** 
   * @param args 
   */
  public static void main(String[] args) throws Exception { 
    // TODO Auto-generated method stub 
    StringBuffer sb = new StringBuffer(); 
    BufferedReader reader = new BufferedReader(new FileReader(new File( 
        "friend_msg.xml"))); 
    while (true) { 
      String s = reader.readLine();// 读一行 
      if (s == null) { 
        break; 
      } 
      sb.append(s); 
    } 
  
    XStream xs = new XStream(new DomDriver()); 
    table_list db = (table_list) xs.fromXML(sb.toString()); 
    System.out.println(db.toString()); 
  
  } 
}

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