ObjectInputStream的使用方法及其注意事项

一、代码及笔记演示

package ioDemo.inputStream;  

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.ObjectInputStream;  
import java.io.ObjectOutputStream;  
import java.util.ArrayList;  
import java.util.List;  
/**** 
 * 写入对象必须将对象序列化 
 *@author <a"[e-mail]">lxd</a> 
 *@version 1.0 2017-3-18 下午3:39:41 
 *@fileName ObjectInputStreamDemo.java 
 */  
public class ObjectInputStreamDemo {  
    public static void main(String[] args) throws Exception {  
        ObjectOutputStream out=null;  
        File file=new File("b.txt");  
        out=new ObjectOutputStream(new FileOutputStream(file));  
        List<Person>list=new ArrayList<Person>();  
        list.add(new Person("Tom", 22, "0002"));  
        list.add(new Person("Jack", 22, "0003"));  
        out.writeObject(list);  


        ObjectInputStream in=null;  
        in=new ObjectInputStream(new FileInputStream(file));  
        List<Person> res=(List<Person>) in.readObject();  
        for(Person p:res){  
            System.out.println(p);  
        }  
    }  
}

1、Person类：

package ioDemo.inputStream;  

import java.io.Serializable;  

public class Person implements Serializable{  
    /** 
     * 
     */  
    private static final long serialVersionUID = 1L;  
    private String name;  
    private int age;  
    private String id;  
    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;  
    }  
    public String getId() {  
        return id;  
    }  
    public void setId(String id) {  
        this.id = id;  
    }  
    public  Person(String name, int age, String id) {  
        super();  
        this.name = name;  
        this.age = age;  
        this.id = id;  
    }  
    @Override  
    public String toString() {  
        return "Person [name=" + name + ", age=" + age + ", id=" + id + "]";  
    }  
    @Override  
    public int hashCode() {  
        final int prime = 31;  
        int result = 1;  
        result = prime * result + ((id == null) ? 0 : id.hashCode());  
        return result;  
    }  
    @Override  
    public boolean equals(Object obj) {  
        if (this == obj)  
            return true;  
        if (obj == null)  
            return false;  
        if (getClass() != obj.getClass())  
            return false;  
        Person other = (Person) obj;  
        if (id == null) {  
            if (other.id != null)  
                return false;  
        } else if (!id.equals(other.id))  
            return false;  
        return true;  
    }  


}

二、运行结果

三、总结：

1、ObjectInputStream writerObject对象的时候，不能直接添加，需要将此类实现序列化serializable。