Java ObjectInputStream和ObjectOutputStream示例

ObjectOutputStram类用于将Java对象的原始数据类型和图形存储到输出流，而ObjectInputStream类用于从输入流中读取Java对象的原始数据类型和图形。

注 – 只有那些类实现java.io.Serializable接口的对象才能被写入流。

下面是一个演示ObjectOutputStram和ObjectInputStream的示例。

文件：User.java –

package com.yiibai.tutorial.io;  import java.io.Serializable;  /**  * @author yiibai   */ public class User implements Serializable {      private static final long serialVersionUID = -3389363800876569458L;     private int id;     private String name;      public User(int id, String name) {         this.id = id;         this.name = name;     }      public int getId() {         return id;     }      public void setId(int id) {         this.id = id;     }      public String getName() {         return name;     }      public void setName(String name) {         this.name = name;     }      @Override     public String toString() {         return "ID="+this.id+" NAME="+this.name;     } } 

在上面的示例中，User类实现了Serializable接口，现在我们可以将其对象存储到输出流中。

文件：ObjectInputOutputStreamExample.java –

package com.yiibai.tutorial.io;  import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.Date;  /**  * @author yiibai  */ public class ObjectInputOutputStreamExample {     public static void main(String[] args) {         File file = new File("file.txt");          /* Write object and primitive data type to output stream */         FileOutputStream fileOutputStream = null;         ObjectOutputStream outputStream = null;         try {             fileOutputStream = new FileOutputStream(file);             outputStream = new ObjectOutputStream(fileOutputStream);             // Write int value             outputStream.writeInt(500);             // Write date             outputStream.writeObject(new Date());             // Write User object             outputStream.writeObject(new User(1, "yiibai"));         } catch (IOException e) {             e.printStackTrace();         } finally {             try {                 if (fileOutputStream != null) {                     fileOutputStream.close();                 }                 if (outputStream != null) {                     outputStream.close();                 }             } catch (IOException e) {                 e.printStackTrace();             }         }          /* Read object and primitive data type from input stream */         FileInputStream fileInputStream = null;         ObjectInputStream objectInputStream = null;         try {             fileInputStream = new FileInputStream(file);             objectInputStream = new ObjectInputStream(fileInputStream);             // Read int             int value = objectInputStream.readInt();             System.out.println(value);             // Read date             Date date = (Date) objectInputStream.readObject();             System.out.println(date);             // Read User object             User user = (User) objectInputStream.readObject();             System.out.println(user);          } catch (IOException | ClassNotFoundException e) {             e.printStackTrace();         } finally {             try {                 if (fileInputStream != null) {                     fileInputStream.close();                 }                 if (objectInputStream != null) {                     objectInputStream.close();                 }             } catch (IOException e) {                 e.printStackTrace();             }         }     } } 

执行上面示例代码，得到以下结果：

500 Sun Nov 06 10:21:52 IST 2016 ID=1 NAME=yiibai