Java.io.ObjectInputStream.getField.getObjectStreamClass()方法實例

描述

The java.io.ObjectInputStream.getField.getObjectStreamClass() method gets the ObjectStreamClass that describes the fields in the stream.

聲明

Following is the declaration for java.io.ObjectInputStream.getField.getObjectStreamClass() method

public abstract ObjectStreamClass getObjectStreamClass()

參數

• NA

返回值

This method returns the descriptor class that describes the serializable fields

異常

• NA

實例一

以下例子將告訴你如何使用 java.io.ObjectInputStream.getField.getObjectStreamClass() method.

package gitbook.net;

import java.io.*;

public class ObjectInputStreamDemo implements Serializable {

   public static void main(String[] args) {

      try {

         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeObject(new Example());
         oout.flush();
         oout.close();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois =
                 new ObjectInputStream(new FileInputStream("test.txt"));

         // read an object from the stream and cast it to Example
         Example a = (Example) ois.readObject();

         // print var of a
         System.out.println("" + a.var);

         // get and print the objectStreamClass
         System.out.println("" + a.v);

      } catch (Exception ex) {
         ex.printStackTrace();
      }

   }

   static public class Example implements Serializable {

      static String var = "Hello World";
      static ObjectStreamClass v;
      // assign a new serialPersistentFields 
      private static final ObjectStreamField[] serialPersistentFields = {
         new ObjectStreamField("var", String.class)
      };

      private void readObject(ObjectInputStream in)
              throws IOException, ClassNotFoundException {

         // get the field and assign it at var
         ObjectInputStream.GetField fields = in.readFields();

         // get var
         var = (String) fields.get("var", "reset");
         v = fields.getObjectStreamClass();
      }

      private void writeObject(ObjectOutputStream out)
              throws IOException {

         // write into the ObjectStreamField array the variable string
         ObjectOutputStream.PutField fields = out.putFields();
         fields.put("var", var);
         out.writeFields();

      }
   }
}

編譯和執行以上程序，將得到以下的結果：

Hello World
gitbook.net.ObjectInputStreamDemo$Example: static final long serialVersionUID = 1534274623819585475L;

貢獻/合作者

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