java中ObjectOutputStream保存对象

男娘i 2022-02-02 13:23 225阅读 0赞

package com.javabase.p1;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.io.OutputStream;
    import java.io.Serializable;
    
    public class Demoobjout {
    
    	//Java语言只能将实现了Serializable接口的类的对象保存到文件中
    	public static void main(String[] args)  {
    		String str = "我想去海南吃龙虾";
    		String path = "c:/100.dat";
    		String sname = "王小美";
    		int age = 30;
    		
    		Person p = new Person(sname,age,str);
    		//写入并保存对象
    		sWriteObj(p,path);
    		System.out.println("对象已写入硬盘");
    		
    		Person p101 = null;
    		//从磁盘读取对象
    		p101 = sReadObj(path);
    		if(p101 == null) {
    			System.out.println("读取对象错误");
    			}else {
    				System.out.println(p101.getsName() +"   "+ p101.getIage() + "    " +p101.getStr());
    				//比较两个对象的地址是否一样
    				System.out.println(p == p101);
    				
    			}
    		
    		
    		
    		
    
    	}
    	
    	/**
    	 * 写入对象到硬盘
    	 * @param pSon 需要保存的对象
    	 * @param path 路径 全名
    	 */
    	public static void sWriteObj(Person pSon,String path)  {
    	
    			OutputStream ops = null;
    			ObjectOutputStream oos = null;
    			try {
    				ops = new FileOutputStream(path);
    				oos = new ObjectOutputStream(ops);
    				oos.writeObject(pSon);
    			} catch (FileNotFoundException e) {
    				e.printStackTrace();
    			}catch (IOException e) {
    				e.printStackTrace();
    			}finally {
    				try {
    					oos.close();
    					ops.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    				
    			}
    
    	}
    	
    	
    	/**
    	 * 读取对象
    	 * @param path 全路径
    	 * @return 返回 Person对象
    	 */
    	public static Person sReadObj(String path)  {
    		Person pSon = null;
    		try(
    				InputStream is = new FileInputStream(path);
    				ObjectInputStream ois = new ObjectInputStream(is);
    					
    			) {
    			pSon = (Person)ois.readObject();
    			
    		} catch (Exception e) {
    			//出错返回null
    			return null;
    		}
    		
    
    		return pSon;
    		
    	}
    
    }
    
    //Java语言只能将实现了Serializable接口的类的对象保存到文件中
    //要保存的对象类必须实现 Serializable 接口
    class  Person implements Serializable{
    
    	private static final long serialVersionUID = -3836658895819502595L;
    	private String str = null;
    	private String sName = null;
    	private int iage = 0;
    	
    	
    	public  Person() {}
    	
    	public Person(String name,int age,String s) {
    		setsName(name);
    		setIage(age);
    		setStr(s);
    	}
    
    	
    	public String getStr() {
    		return str;
    	}
    
    	public void setStr(String str) {
    		this.str = str;
    	}
    
    
    	
    	public String getsName() {
    		return sName;
    	}
    	public void setsName(String sName) {
    		this.sName = sName;
    	}
    	public int getIage() {
    		return iage;
    	}
    	public void setIage(int iage) {
    		this.iage = iage;
    	}
    	
    
    }