什么是Java序列化？

╰+攻爆jí腚メ 2022-03-12 16:40 295阅读 0赞

[什么是Java序列化，如何实现java序列化][Java_java]

package cn.itcast.demo2;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.io.Serializable;
    
    public class People implements Serializable{
    	private String name;
    	private int age;
    	public People(){
    		this.name = "lili";
    		this.age = 20;
    	}
    	
    	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;
    	}
    	/**
    	 * java.io.ObjectOutputStream代表对象输出流
    	 * 它的writeObject(Object obj)方法可对参数指定的obj对象进行序列化
    	 * 把得到的字节序列写到一个目标输出流中。
    	 * 只有实现了Serializable和Externalizable接口的类的对象才能被序列化。
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		People p = new People();
    		ObjectOutputStream oos = null;
    		ObjectInputStream ois = null;		
    		try {
    			//序列化对象
    			FileOutputStream fos = new FileOutputStream("perple.out");
    			oos = new ObjectOutputStream(fos);
    			oos.writeObject(p);
    			oos.close();
    		} catch (IOException e) {
    			
    			e.printStackTrace();
    		}
    		People p1;
    		/**
    		 * java.io.ObjectInputStream代表对象输入流
    		 * 它的readObject()方法从一个源输入流中读取字节序列
    		 * 再把它们反序列化为一个对象，并将其返回。
    		 */
    		try {
    			//反序列化对象
    			FileInputStream fis = new FileInputStream("perple.out");
    			ois = new ObjectInputStream(fis);
    			p1 = (People) ois.readObject();
    			System.out.println("name:" + p1.getName());
    			System.out.println("age:" + p1.getAge());
    			ois.close();
    		} catch (Exception e) {
    			
    			e.printStackTrace();
    		}		
    	}
    
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70]

package cn.itcast.demo2;
    
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.util.Date;
    
    public class ObjectSaver {
    	public static void main(String[] args) {
    		/*其中的 "perple.out" 表示存放序列化对象的文件*/
    		//序列化对象
    		ObjectOutputStream oos = null;
    		ObjectInputStream ois = null;		
    		try {
    			FileOutputStream fos = new FileOutputStream("perple.out");
    			oos = new ObjectOutputStream(fos);
    			Customer customer = new Customer("王麻子", 24);
    			oos.writeObject("你好!");
    			oos.writeObject(new Date());
    			oos.writeObject(customer);
    			oos.close();
    		} catch (Exception e) {
    			
    			e.printStackTrace();
    		}
    		Customer obj3 = null;
    		//反序列化对象
    		try {
    			FileInputStream fis = new FileInputStream("perple.out");
    			ois = new ObjectInputStream(fis);
    			System.out.println("obj1 " + (String) ois.readObject());    //读取字面值常量
    			System.out.println("obj2 " + (Date) ois.readObject());    //读取匿名Date对象
    			obj3 = (Customer) ois.readObject();    //读取customer对象
    			System.out.println("obj3 " + obj3);
    			ois.close();
    		} catch (Exception e) {
    			// TODO: handle exception
    			System.out.println(e);
    		}
    		
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 1]

[Java_java]: https://www.cnblogs.com/yangchunze/p/6728086.html
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