Java序列化和反序列化

1、什么是序列化和反序列化

序列化：把对象转换为字节序列的过程。

反序列化：把字节序列恢复成对象的过程。

2、被序列化的类需要实现serializable接口，只是为了标注该对象是可以被序列化的，并没有需要实现的方法。

3、示例：

新建Student类

import java.io.Serializable;
public class Student implements Serializable{

    private String name;
    private int age;

    private static final long serialVersionUID = 1L;

    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;
    }
}

新建转换工具类SerializeUtils：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SerializeUtils {
    public byte[] Serialize(Object object) {
        ByteArrayOutputStream byteArrayOutPutStream = new ByteArrayOutputStream();
        try {
            ObjectOutputStream objectOutPutStream = new ObjectOutputStream(byteArrayOutPutStream);
            //将对象写入到字节数组中进行序列化
            objectOutPutStream.writeObject(object);
            return byteArrayOutPutStream.toByteArray();
        }catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public Object deSerialize (byte[] bytes) {
        //将二进制数组导入字节数据流中
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        try {
            //将字节数组留转化为对象
            ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
            return objectInputStream.readObject();
        }catch (IOException e) {
            e.printStackTrace();
        }catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
}

新建测试类test_serializable:

public class test_serializable {
    public static void main(String[] args) {
        SerializeUtils serializeUtils = new SerializeUtils();
        Student student = new Student();
        student.setName("kobe");
        student.setAge(20);
        byte[] serializObject = serializeUtils .Serialize(student);
        System.out.println(serializObject);

        Student e = (Student)serializeUtils.deSerialize(serializObject);
        System.out.println("Name: " + e.getName()+",Age: " + e.getAge());
    }
}