hessian参数序列化过程

hessian协议在调用api的时候会对参数进行序列化：

AbstractHessianOutput out = hessianClient.getHessianOutput(os);


out.call(methodName, args);


out.flush();

 在out.call(methodName,args)的过程中hessian对args进行了序列化：

//com.caucho.hessian.io.HessianOutput 
 public void call(String method, Object []args)
    throws IOException
  {
    startCall(method);
    
    if (args != null) {
      for (int i = 0; i < args.length; i++)
        writeObject(args[i]);
    }
    
    completeCall();
  }

/**
* 调用序列化器对参数进行序列化
*/
public void writeObject(Object object)
    throws IOException
  {
    if (object == null) {
      writeNull();
      return;
    }

    Serializer serializer;

    serializer = _serializerFactory.getSerializer(object.getClass());

    serializer.writeObject(object, this);
  }

 

hessian的序列化器工厂类：com.caucho.hessian.io.SerializerFactory

 

public Serializer getSerializer(Class cl)
    throws HessianProtocolException
  {
    Serializer serializer;

    serializer = (Serializer) _staticSerializerMap.get(cl);
    if (serializer != null)
      return serializer;

    if (_cachedSerializerMap != null) {
      synchronized (_cachedSerializerMap) {
	serializer = (Serializer) _cachedSerializerMap.get(cl);
      }
      
      if (serializer != null)
	return serializer;
    }

    for (int i = 0;
	 serializer == null && _factories != null && i < _factories.size();
	 i++) {
      AbstractSerializerFactory factory;

      factory = (AbstractSerializerFactory) _factories.get(i);

      serializer = factory.getSerializer(cl);
    }

    if (serializer != null) {
    }

    else if (JavaSerializer.getWriteReplace(cl) != null)
      serializer = new JavaSerializer(cl);

    else if (HessianRemoteObject.class.isAssignableFrom(cl))
      serializer = new RemoteSerializer();

    else if (BurlapRemoteObject.class.isAssignableFrom(cl))
      serializer = new RemoteSerializer();

    else if (Map.class.isAssignableFrom(cl)) {
      if (_mapSerializer == null)
	_mapSerializer = new MapSerializer();
      
      serializer = _mapSerializer;
    }
    else if (Collection.class.isAssignableFrom(cl)) {
      if (_collectionSerializer == null) {
	_collectionSerializer = new CollectionSerializer();
      }

      serializer = _collectionSerializer;
    }

    else if (cl.isArray())
      serializer = new ArraySerializer();

    else if (Throwable.class.isAssignableFrom(cl))
      serializer = new ThrowableSerializer(cl);

    else if (InputStream.class.isAssignableFrom(cl))
      serializer = new InputStreamSerializer();

    else if (Iterator.class.isAssignableFrom(cl))
      serializer = IteratorSerializer.create();

    else if (Enumeration.class.isAssignableFrom(cl))
      serializer = EnumerationSerializer.create();
    
    else if (Calendar.class.isAssignableFrom(cl))
      serializer = CalendarSerializer.create();
    
    else if (Locale.class.isAssignableFrom(cl))
      serializer = LocaleSerializer.create();
    
    else if (Enum.class.isAssignableFrom(cl))
      serializer = new EnumSerializer(cl);

    if (serializer == null)
      serializer = getDefaultSerializer(cl);

    if (_cachedSerializerMap == null)
      _cachedSerializerMap = new HashMap(8);

    synchronized (_cachedSerializerMap) {
      _cachedSerializerMap.put(cl, serializer);
    }

    return serializer;
  }

 

从这里大家可以看到Hessain支持的参数类型，如果不支持就会抛出：

Hessian exception:Serialized class #classFullName# must implement java.io.Serializable