Java ObjectInputStream readStreamHeader() Method

The readStreamHeader() method of ObjectInputStream is used to allow subclasses to read and verify their respective stream headers. It reads and verifies the magic number and version number.

Syntax

Parameter

Returns

Throws

IOException - if there are I/O errors while reading from the underlying InputStream

StreamCorruptedException - if control information in the stream is inconsistent.

Example 1

import java.io.*;
public class ObjectInputStreamreadStreamHeaderExample1 extends ObjectInputStream {
   public ObjectInputStreamreadStreamHeaderExample1(InputStream in) throws IOException {
      super(in);
   }

   public static void main(String[] args) {
      String s = "welcome to javaTpoint";
      
      try {
         // create a new file with an ObjectOutputStream
         FileOutputStream outstream = new FileOutputStream("file1.txt");
         ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);

         // write something in the file
         objoutstream.writeUTF(s);
         objoutstream.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStreamreadStreamHeaderExample1 objinstream = new ObjectInputStreamreadStreamHeaderExample1(new FileInputStream("file1.txt"));
         
         // get the class for string and print the name
         System.out.println("" + objinstream.resolveObject(objinstream.readUTF()));
         objinstream.readStreamHeader();
      } catch (Exception ex) {    
      }
   }
}

Output:

welcome to javaTpoint

Example 2

package ObjectInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
public class ObjectInputStreamreadStreamHeaderExample2  extends ObjectInputStream {
    public ObjectInputStreamreadStreamHeaderExample2(InputStream in)  throws IOException {
          super(in);
         this.readStreamHeader();
    }
   public static void main(String[] args) throws IOException {
      double[] carray = {21.0, 22.0 , 23.0 , 45.0 , 67.9 , 66.0};
     
      try {
         // create file output stream
       FileOutputStream   fileoutstream = new FileOutputStream("file1.txt");
         
         // create data output stream
        DataOutputStream dataoutstream = new DataOutputStream(fileoutstream);
         
         // for each byte in the buffer
         for (double b:carray) {
            // write character to the dos
            dataoutstream.writeDouble(b);
         }
         
         // force bytes to the underlying stream
         dataoutstream.flush();
         
         // create file input stream
         InputStream inpstream = new FileInputStream("file1.txt");
        //ObjectInputStreamresolveObjectExample2 objinstream = new ObjectInputStreamresolveObjectExample2(new FileInputStream("file1.txt"));
         // create new data input stream
        DataInputStream datainpstream = new DataInputStream(inpstream);
        
         // read till end of the stream
         for(int i=0;i<=carray.length;i++){ 
         
            // read double values in float format
            float c = datainpstream.readFloat();
          //  System.out.println("" + objinstream.resolveObject(objinstream.readUTF()));
            // print
            System.out.print("    "+c);
         } 
      } catch(Exception e) {
      } 
   }
}

Output:

2.828125    0.0    2.84375    0.0    2.859375    0.0    3.1015625

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