要实现对象的序列化,最直接的操作就是实现Serializable接口,使用IO流中的对象流可以实现序列化操作,将对象保存到文件,再读取出来。
首先创建一个对象,并实现Serializable接口:
import java.io.Serializable; public class User implements Serializable { private static final long serialVersionUID = 1L; private String name; private int 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 "User [name=" + name + ", age=" + age + "]"; } }
用对象流写一个保存对象与读取对象的工具类:
import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; public class SerializeUtil { // 保存对象,序列化 public static void saveObject(Object object) throws Exception { ObjectOutputStream out = null; FileOutputStream fout = null; try { fout = new FileOutputStream("D:/user.txt"); out = new ObjectOutputStream(fout); out.writeObject(object); } finally { fout.close(); out.close(); } } // 读取对象,反序列化 public static Object readObject() throws Exception { ObjectInputStream in = null; FileInputStream fin = null; try { fin = new FileInputStream("D:/user.txt"); in = new ObjectInputStream(fin); Object object = in.readObject(); return object; } finally { fin.close(); in.close(); } } }
测试:
public class Main { public static void main(String[] args) { User user = new User(); user.setName("海绵宝宝"); user.setAge(20); // 保存 try { SerializeUtil.saveObject(user); } catch (Exception e) { System.out.println("保存时异常:" + e.getMessage()); } // 读取 User userObject; try { userObject = (User) SerializeUtil.readObject(); System.out.println(userObject); } catch (Exception e) { System.out.println("读取时异常:" + e.getMessage()); } } } /* * 运行结果:User [name=海绵宝宝, age=20] */