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Java ObjectInputStream readObject()用法及代码示例


ObjectInputStream 类的 readObject() 方法用于从 objectinputstream 中读取一个对象。它读取对象的类、类的签名、静态、非静态字段和超类型。

用法

public final  Object  readObject() throws  IOException, ClassNotFoundException

参数

NA

返回

从流中读取的对象。

抛出

类未找到异常

无效类异常

流损坏异常

可选数据异常

IOException

例子1

import java.io.*;
import static java.lang.System.out;

public class ObjectInputStreamreadObjectExample1 {
   public static void main(String[] args) {
      try {
          String str1 = "JavaTpoint";
          FileOutputStream outstream = new FileOutputStream("file1.txt");
          ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);
          objoutstream.writeObject(new WorkClass());
          objoutstream.writeObject(str1);
          objoutstream.flush();
          ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream("file1.txt"));
          WorkClass  obj = (WorkClass) objinstream.readObject();
          System.out.println("String in Serializable Class  :" + obj.str);
          System.out.println("String in MainClass : " +str1);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }

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

输出：

String in Serializable Class  :Welcome to javaTpoint
String in MainClass : JavaTpoint

例子2

package ObjectInputStream;

import java.io.*;
import java.io.ObjectInputStream;

public class ObjectInputStreamreadObjectExample2   {
   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 WorkClass());
          objoutstream.writeObject(str);
          objoutstream.flush();
         ObjectInputStream objinputstram = new ObjectInputStream(new FileInputStream("file1.txt"));
         //read the object from object input stream and cast it to String type.
         System.out.println("" + (String) objinstream.readObject());
          //read the object from object input stream and cast it to workclass typr.
         WorkClass obj1 = (WorkClass) objinputstram.readObject();
         System.out.println("string  in Work class :" + obj1.str1);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
   static class WorkClass implements Serializable {
      String str1 = "javaTpoint";
      private void readObject(ObjectInputStream objin)
         throws IOException, ClassNotFoundException {
         objin.defaultReadObject();
      }
   }
}

输出：

[email protected]
string  in Work class :javaTpoint




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注：本文由纯净天空筛选整理自 Java ObjectInputStream readObject() 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。