JAVA开发基础（使用IO对象操作流）

对象操作流

对象操作流可以将一个对象写出， 或者读取一个对象到程序中，也就是执行了序列化和反序列化的操作。

• 举个例子

先构造一个Role类：

package com.guiyang.bean; import java.io.Serializable; public class Role implements Serializable { private String name; private int age; public Role() { super(); } public Role(String name, int age) { super(); this.name = name; this.age = 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 "Role [name=" + name + ", age=" + age + "]"; } } 

注意，如果要序列化，该类就要实现Serializable接口.

敲入如下Java代码，将对象存入role.txt：

package com.guiyang.bean; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.security.acl.Permission; public class Demo3_ObjectOutputStream { public static void main(String[] args) throws IOException { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("role.txt")); Role p1 = new Role("Ada", 19); Role p2 = new Role("Jack", 20); oos.writeObject(p1); oos.writeObject(p2); oos.close(); } } 

我们再读取role.txt文件：

package com.guiyang.bean; 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.security.acl.Permission; public class Demo3_ObjectOutputStream { public static void main(String[] args) throws IOException, ClassNotFoundException { ObjectInputStream ois = new ObjectInputStream(new FileInputStream("role.txt")); Role r1 = (Role) ois.readObject(); Role r2 = (Role) ois.readObject(); System.out.println(r1); System.out.println(r2); } } 

输出：

Role [name=Ada, age=19]
Role [name=Jack, age=20] 

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