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Java ObjectInputStream readUnshared()用法及代码示例


ObjectInputStream 类的 readUnshared() 方法从 ObjectInputStream 读取 "unshared" 对象。此方法与 readObject 方法相同,不同之处在于它阻止对 readObject 和 readUnshared 的后续调用返回对通过此调用获得的反序列化实例的其他引用。

用法

public Object readUnshared() throws IOException, ClassNotFoundException

参数

没有传递参数。

返回

对反序列化对象的引用

抛出

类未找到异常

流损坏异常

对象流异常

可选数据异常

IOException

例子1

import java.io.*;
import static java.lang.System.out;
public class ObjectInputStreamreadUnsharedExample1 {
   public static void main(String[] args) {
      try {
      
         FileOutputStream outstream = new FileOutputStream("file1.txt");
         ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
         objoutstream.writeObject(new Task());
         objoutstream.flush();
         ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream("file1.txt"));
          Task  obj = (Task) objinstream.readUnshared();
         System.out.println("" + obj.st);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }

   static class Task implements Serializable {
      String st = "Welcome to javaTpoint";
      private String readObject(ObjectInputStream in) 
         throws IOException, ClassNotFoundException {
         ObjectInputStream.GetField g = in.readFields();
         return (String) g.get("st", null);
      }
   }
}

输出:

Welcome to javaTpoint

例子2

import java.io.*;
import java.io.ObjectInputStream;
public class ObjectInputStreamreadUnsharedExample2   {
   public static void main(String[] args) {
      try {
          FileOutputStream outstream = new FileOutputStream("file1.txt");
          ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
          FileInputStream instream = new FileInputStream("file2.txt");
          ObjectInputStream objinstream = new ObjectInputStream(instream);
          String str=objinstream.toString();
          objoutstream.writeObject(new task());
          objoutstream.writeObject(str);
          objoutstream.flush();
         ObjectInputStream objinputstram = new ObjectInputStream(new FileInputStream("file1.txt"));
         System.out.println("" + (String) objinstream.readObject());
         task obj1 = (task) objinputstram.readUnshared();
         System.out.println("string  in task class :" + obj1.str);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
   static class task implements Serializable {
      String str = "javaTpoint";
      private void readObject(ObjectInputStream in)
         throws IOException, ClassNotFoundException {
         in.defaultReadObject();
      }
   }
}

输出:

[email protected]
string that is in task class :javaTpoint




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注:本文由纯净天空筛选整理自 Java ObjectInputStream readUnshared() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。