序列化Externalizable

深藏阁楼爱情的钟 2022-08-22 15:24 171阅读 0赞

Person.java
    package main;
    
    import java.io.Externalizable;
    import java.io.IOException;
    import java.io.ObjectInput;
    import java.io.ObjectOutput;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    /**@author 		    ctl
     *  @date    		2016-6-1下午3:00:21
     *  @package_name main
     *  @project_name   Spring3.0企业应用开发实战
     *  @version 		version.1.0
     */
    public class Person implements Externalizable{
    	private String id;
    	private String name;
    	
    
    	public String getId() {
    		return id;
    	}
    
    	public void setId(String id) {
    		this.id = id;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	//当序列化对象时,该方法自动调用   
        public void writeExternal(ObjectOutput out) throws IOException{   
            System.out.println("现在执行序列化方法");   
            //可以在序列化时写非自身的变量   
            Date date=new Date();   
            out.writeObject(date);   
            //只序列化userName,userPass变量   
            out.writeObject(name);   
            out.writeObject(id);   
        }   
    
        //当反序列化对象时,该方法自动调用   
        public void readExternal(ObjectInput in) throws IOException,ClassNotFoundException{   
            System.out.println("现在执行反序列化方法");   
            Date date=(Date)in.readObject();   
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
            System.out.println("序列化时间:"+sdf.format(date));
            this.name="name:"+(String)in.readObject();   
            this.id="id:"+(String)in.readObject();   
        }
    
    	public String toString() {
    		return "Person [id=" + id + ", name=" + name + "]";
    	}
    }
    
    	Person per=new Person();
    		per.setId(UUID.randomUUID().toString());
    		per.setName("ctl");
    		File file=new File("D:\\person.obj");
    		ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(file));
    		oos.writeObject(new Date());
    		oos.writeObject(per);
    		oos.close();
    		
    		ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
    		SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    		System.out.println(sdf.format(ois.readObject()));
    		System.out.println(ois.readObject());
    		ois.close();