Java ObjectStreamConstants類代碼示例

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/*******************
 * Handle a string element.
 * 
 * @param obj The RMIObject to populate with class names.
 ******************/
private void handleStringElement(LinkedList<Byte> dataStack) throws BaRMIeInvalidReplyDataPacketException {
	//Handle a string based on the type
	switch(dataStack.pop()) {
		//Standard string
		case ObjectStreamConstants.TC_STRING:
			this.extractUtf8(dataStack);
			break;
			
		//Long string
		case ObjectStreamConstants.TC_LONGSTRING:
			this.extractLongUtf8(dataStack);
			break;
			
		//References
		case ObjectStreamConstants.TC_REFERENCE:
			this.extractInt(dataStack);
			break;
			
		//Invalid string type
		default:
			throw new BaRMIeInvalidReplyDataPacketException("Invalid string element type.");
	}
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
public E readObject() throws ClassNotFoundException, IOException {

    int b = peek();
    if (b == ObjectStreamConstants.TC_NULL) {
      return null;
    } else {
      E obj;
      try {
        obj = type.newInstance();
        obj.readExternal(this);
        return obj;
      } catch (InstantiationException | IllegalAccessException e) {
        throw new RuntimeException(e);
      }
    }
  }
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
public List<Content> read_classAnnotation( DataInputStream dis ) throws IOException
{
	List<Content> list = new ArrayList<Content>();
	while ( true ) {
		byte tc = dis.readByte();
		if ( tc == ObjectStreamConstants.TC_ENDBLOCKDATA ) {
			return list;
		}
		if ( tc == ObjectStreamConstants.TC_RESET ) {
			reset();
			continue;
		}
		Content c = read_Content( tc, dis, true );
		if ( c != null && c.isExceptionObject() ) {
			throw new ReadException( c );
		}
		list.add( c );
	}
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/**
 * Read the content of a thrown exception object. According to the spec, this must be
 * an object of type Throwable. Although the Sun JDK always appears to provide enough
 * information about the hierarchy to reach all the way back to java.lang.Throwable,
 * it's unclear whether this is actually a requirement. From my reading, it's
 * possible that some other ObjectOutputStream implementations may leave some gaps in
 * the hierarchy, forcing this app to hit the classloader. To avoid this, we merely
 * ensure that the written object is indeed an instance; ensuring that the object is
 * indeed a Throwable is an exercise left to the user.
 */
public Content read_Exception( DataInputStream dis ) throws IOException
{
	reset();
	byte tc = dis.readByte();
	if ( tc == ObjectStreamConstants.TC_RESET ) {
		throw new ValidityException( "TC_RESET for object while reading exception: what should we do?" );
	}
	Content c = read_Content( tc, dis, false );
	if ( c == null ) {
		throw new ValidityException( "stream signaled for an exception, but exception object was null!" );
	}
	if ( !( c instanceof Instance ) ) {
		throw new ValidityException( "stream signaled for an exception, but content is not an object!" );
	}
	if ( c.isExceptionObject() ) {
		throw new ReadException( c );
	}
	c.setIsExceptionObject( true );
	reset();
	return c;
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
public BlockData read_blockdata( byte tc, DataInputStream dis ) throws IOException
{
	int size;
	if ( tc == ObjectStreamConstants.TC_BLOCKDATA ) {
		size = dis.readUnsignedByte();
	}
	else if ( tc == ObjectStreamConstants.TC_BLOCKDATALONG ) {
		size = dis.readInt();
	}
	else {
		throw new IOException( "invalid tc value for blockdata: " + hex( tc ) );
	}
	if ( size < 0 ) {
		throw new IOException( "invalid value for blockdata size: " + size );
	}
	byte[] b = new byte[size];
	dis.readFully( b );
	debug( "read blockdata of size " + size );
	return new BlockData( b );
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
public void validate() throws ValidityException
{
	// If neither SC_SERIALIZABLE nor SC_EXTERNALIZABLE is set, then the number of
	// fields is always zero. (spec section 4.3)
	if ( ( descflags & ( ObjectStreamConstants.SC_SERIALIZABLE | ObjectStreamConstants.SC_EXTERNALIZABLE ) ) == 0 && fields != null
		&& fields.length > 0 ) {
		throw new ValidityException( "non-serializable, non-externalizable class has fields!" );
	}
	if ( ( descflags
		& ( ObjectStreamConstants.SC_SERIALIZABLE | ObjectStreamConstants.SC_EXTERNALIZABLE ) ) == ( ObjectStreamConstants.SC_SERIALIZABLE
			| ObjectStreamConstants.SC_EXTERNALIZABLE ) ) {
		throw new ValidityException( "both Serializable and Externalizable are set!" );
	}
	if ( ( descflags & ObjectStreamConstants.SC_ENUM ) != 0 ) {
		// we're an enum; shouldn't have any fields/superinterfaces
		if ( ( fields != null && fields.length > 0 ) || interfaces != null ) {
			throw new ValidityException( "enums shouldn't implement interfaces or have non-constant fields!" );
		}
	}
	else {
		// non-enums shouldn't have enum constant fields.
		if ( enumconstants != null && enumconstants.size() > 0 ) {
			throw new ValidityException( "non-enum classes shouldn't have enum constants!" );
		}
	}
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
private static void initialize() {
   try {
      ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
      DataOutputStream dout = new DataOutputStream(byteOut);
      dout.writeShort(ObjectStreamConstants.STREAM_MAGIC);
      dout.writeShort(ObjectStreamConstants.STREAM_VERSION);
      HEADER = byteOut.toByteArray();

      byteOut = new ByteArrayOutputStream();
      dout = new DataOutputStream(byteOut);

      dout.writeByte(ObjectStreamConstants.TC_OBJECT);
      dout.writeByte(ObjectStreamConstants.TC_REFERENCE);
      dout.writeInt(ObjectStreamConstants.baseWireHandle);
      REPEATING_DATA = byteOut.toByteArray();
   }
   catch(IOException e) {
      throw new Error("IOException: " + e.getMessage());
   }

}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/*******************
 * Handle a classDesc element.
 * 
 * @param obj The RMIObject to populate with class names.
 * @param dataStack The remaining data in the ReplyData packet.
 ******************/
private void handleClassDesc(RMIObject obj, LinkedList<Byte> dataStack) throws BaRMIeInvalidReplyDataPacketException {
	String className;
	
	//Delegate depending on the type of classDesc
	switch(dataStack.pop()) {
		//ClassDesc
		case ObjectStreamConstants.TC_CLASSDESC:
			//Read the class name
			className = this.extractUtf8(dataStack);
			
			//Skip over the serialVersionUID
			this.extractLong(dataStack);
			
			//Handle the classDescInfo element, pass the class name in as there may be annotations for the class in there
			this.handleClassDescInfo(obj, dataStack, className);
			break;
			
		//ProxyClassDesc
		case ObjectStreamConstants.TC_PROXYCLASSDESC:
			//Handle the proxyClassDescInfo element
			this.handleProxyClassDescInfo(obj, dataStack);
			break;
			
		//Null - e.g. when the super class is null
		case ObjectStreamConstants.TC_NULL:
			break;
			
		//Unknown classDesc type
		default:
			throw new BaRMIeInvalidReplyDataPacketException("Unknown classDesc element type.");
	}
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/*******************
 * Handle a classAnnotation element and return any string annotation
 * elements in the classAnnotation.
 * 
 * @param obj The RMIObject to populate with class names.
 * @param dataStack The remaining data in the ReplyData packet.
 * @return An ArrayList of strings representing any string annotations extracted from the stream.
 ******************/
private ArrayList<String> handleClassAnnotation(RMIObject obj, LinkedList<Byte> dataStack) throws BaRMIeInvalidReplyDataPacketException {
	ArrayList<String> stringAnnotations;
	byte b;
	
	//Create the arraylist
	stringAnnotations = new ArrayList<String>();
	
	//Read elements from the stream until a TC_ENDBLOCKDATA element is read
	while((b = dataStack.pop()) != ObjectStreamConstants.TC_ENDBLOCKDATA) {
		//Handle the annotation
		switch(b) {
			//Read string annotations into an array list to return
			case ObjectStreamConstants.TC_STRING:
				stringAnnotations.add(this.extractUtf8(dataStack));
				break;
				
			//Skip over reference annotations
			case ObjectStreamConstants.TC_REFERENCE:
				//Read past the reference handle
				this.extractInt(dataStack);
				break;
				
			//Ignore null annotations...
			case ObjectStreamConstants.TC_NULL:
				break;
				
			//Unknown annotation type
			default:
				throw new BaRMIeInvalidReplyDataPacketException("Unknown classAnnotation element type (0x" + String.format("%02x", b) + ").");
		}
	}
	
	//Return the string annotations
	return stringAnnotations;
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/*******************
 * Handle an objectAnnotation element, extracting the object endpoint
 * details if found.
 * 
 * @param obj The RMIObject to populate with class names.
 * @param dataStack The remaining data in the ReplyData packet.
 ******************/
private void handleObjectAnnotation(RMIObject obj, LinkedList<Byte> dataStack) throws BaRMIeInvalidReplyDataPacketException {
	byte b;
	
	//Read elements from the stream until a TC_ENDBLOCKDATA element is read
	while((b = dataStack.pop()) != ObjectStreamConstants.TC_ENDBLOCKDATA) {
		//Handle the annotation
		switch(b) {
			//Look for object endpoint details in block data elements
			case ObjectStreamConstants.TC_BLOCKDATA:
				//Push the block type back on to the stack and extract endpoint details if found
				dataStack.push(ObjectStreamConstants.TC_BLOCKDATA);
				this.extractObjectEndpointFromBlockData(obj, dataStack);
				break;
				
			//Skip over object annotations
			case ObjectStreamConstants.TC_OBJECT:
				this.handleNewObjectElement(obj, dataStack);
				break;
				
			//Ignore null annotations...
			case ObjectStreamConstants.TC_NULL:
				break;
				
			//Unknown annotation type
			default:
				throw new BaRMIeInvalidReplyDataPacketException("Unknown classAnnotation element type (0x" + String.format("%02x", b) + ").");
		}
	}
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/**
 * Creates a new <code>MarshalledObjectOutputStream</code> whose
 * non-location bytes will be written to <code>objOut</code> and whose
 * location annotations (if any) will be written to
 * <code>locOut</code>.
 */
MarshalledObjectOutputStream(OutputStream objOut, OutputStream locOut)
    throws IOException
{
    super(objOut);
    this.useProtocolVersion(ObjectStreamConstants.PROTOCOL_VERSION_2);
    this.locOut = new ObjectOutputStream(locOut);
    hadAnnotations = false;
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/**
 * Verify the class cannot be deserialized from a handcoded stream.
 * Fail if the deserialization does <em>not</em> throw an Exception.
 * @param serClass the class to embed in the handcoded stream
 * @throws Exception if an unexpected condition occurs
 */
protected static void assertNotSerializable(Class<?> serClass) throws Exception {
    Field field = serClass.getDeclaredField("serialVersionUID");
    field.setAccessible(true);
    long serVer = (Long) field.get(null);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try (DataOutputStream out = new DataOutputStream(baos)) {
        out.writeShort(ObjectStreamConstants.STREAM_MAGIC);
        out.writeShort(ObjectStreamConstants.STREAM_VERSION);
        out.writeByte(ObjectStreamConstants.TC_OBJECT);
        out.writeByte(ObjectStreamConstants.TC_CLASSDESC);
        out.writeUTF(serClass.getName());
        out.writeLong(serVer);
        out.writeByte(ObjectStreamConstants.SC_SERIALIZABLE);   // Flags ObjectStreamConstants
        out.writeShort(0);  // number of fields
        out.writeByte(ObjectStreamConstants.TC_ENDBLOCKDATA);
        out.writeByte(ObjectStreamConstants.TC_NULL);  // no superclasses
    }

    byte[] bytes = baos.toByteArray();

    try (ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
        ObjectInputStream in = new ObjectInputStream(bis)) {
        Object o = in.readObject();
    } catch (Exception ioe) {
        // Expected exception
        return;
    }
    fail("Class should not be deserializable " + serClass.getName());
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
/**
 * Verify the class cannot be deserialized from a handcoded stream.
 * Fail if the deserialization does <em>not</em> throw an Exception.
 * @param serClass the class to embed in the handcoded stream
 * @throws Exception if an unexpected condition occurs
 */
protected static void assertNotSerializable(Class<?> serClass) throws Exception {
    long serVer = getSUID(serClass);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try (DataOutputStream out = new DataOutputStream(baos)) {
        out.writeShort(ObjectStreamConstants.STREAM_MAGIC);
        out.writeShort(ObjectStreamConstants.STREAM_VERSION);
        out.writeByte(ObjectStreamConstants.TC_OBJECT);
        out.writeByte(ObjectStreamConstants.TC_CLASSDESC);
        out.writeUTF(serClass.getName());
        out.writeLong(serVer);
        out.writeByte(ObjectStreamConstants.SC_SERIALIZABLE);   // Flags ObjectStreamConstants
        out.writeShort(0);  // number of fields
        out.writeByte(ObjectStreamConstants.TC_ENDBLOCKDATA);
        out.writeByte(ObjectStreamConstants.TC_NULL);  // no superclasses
    }

    byte[] bytes = baos.toByteArray();

    try (ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
        ObjectInputStream in = new ObjectInputStream(bis)) {
        Object o = in.readObject();
    } catch (Exception ioe) {
        // Expected exception
        return;
    }
    fail("Class should not be deserializable " + serClass.getName());
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
@Test()
public void test_hijrahSerialization_format() throws Exception {
    HijrahChronology chrono = HijrahChronology.INSTANCE;
    HijrahDate date = HijrahDate.of(1433, 10, 29);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    // Expect the type of the HijrahDate in the stream
    byte[] hijrahDateBytes = new byte[] {HIJRAH_DATE_TYPE};

    // Literal reference to Hijrah-Umalqura Chronology
    byte[] hijrahChronoBytes = new byte[] {
        115, 113, 0, 126, 0, 0,                        /* p w \u0001 \u0006 s q \u0000 ~ \u0000 \u0000 */
        119, 18, 1, 0, 15, 72, 105, 106, 114, 97,      /* w \u0012 \u0001 \u0000 \u000f H i j r a */
        104, 45, 117, 109, 97, 108, 113, 117, 114, 97, /* h - u m a l q u r a */
        120,                                           /*  \u001d x */
    };

    // Build the sequence that represents the data in the stream
    baos = new ByteArrayOutputStream();
    try (DataOutputStream dos = new DataOutputStream(baos) ) {
        dos.writeByte(ObjectStreamConstants.TC_BLOCKDATA);
        dos.writeByte(6);   // 6 bytes follow
        dos.writeInt(date.get(YEAR));
        dos.writeByte(date.get(MONTH_OF_YEAR));
        dos.writeByte(date.get(DAY_OF_MONTH));
        dos.writeByte(ObjectStreamConstants.TC_ENDBLOCKDATA);
    }
    byte[] dateBytes = baos.toByteArray();

    assertSerializedBySer(date, hijrahDateBytes, hijrahChronoBytes, dateBytes);
}
 

import java.io.ObjectStreamConstants; //導入依賴的package包/類
@Override
protected void decodeLast(ChannelHandlerContext ctx, ByteBuf buffer, List<Object> out) throws Exception {
    switch (buffer.readableBytes()) {
    case 0:
        return;
    case 1:
        // Ignore the last TC_RESET
        if (buffer.getByte(buffer.readerIndex()) == ObjectStreamConstants.TC_RESET) {
            buffer.skipBytes(1);
            return;
        }
    }

    decode(ctx, buffer, out);
}