Java序列化(ObjectOutputStream)和反序列化(ObjectInputStream)
序列化:用ObjectOutputStream类保存基本类型数据或对象的机制
反序列化:用ObjectInputStream类读取基本类型数据或对象的机制
ObjectOutputStream和ObjectInputStream不能序列化static和transient修饰的成员变量
- 以String为例测试
package mytest;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
public class ObjectOutputStreamTest {
public static void main(String[] args) {
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(new FileOutputStream("object.data"));
oos.writeObject(new String("这是一个测试!"));
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
package mytest;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
public class ObjectInputStreamTest {
public static void main(String[] args) {
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(new FileInputStream("object.data"));
Object obj = ois.readObject();
String str = (String)obj;
System.out.println(str);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
-
自定义类person测试
2.1 自定义类序列化需要实现接口:Serializable
2.2 提供一个全局常量:serialVersionUID
package mytest;
import java.io.Serializable;
public class Person implements Serializable {
private static final long serialVersionUID = 537106506708875853L;
private String name;
private int age;
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
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
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
package mytest;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
public class ObjectOutputStreamTest2 {
public static void main(String[] args) {
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(new FileOutputStream("object.data"));
oos.writeObject(new Person("张三",30));
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
oos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
package mytest;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
public class ObjectInputStreamTest2 {
public static void main(String[] args) {
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(new FileInputStream("object.data"));
Object obj = ois.readObject();
Person p = (Person) obj;
System.out.println(p);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
ois.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}