update md

weixin4j-server/src/main/java/com/foxinmy/weixin4j/socket/README.md

@@ -1,5 +1,7 @@
-WeixinMessageDecoder:对微信消息进行解码
+WeixinMessageDecoder:对微信消息解码
 
 WeixinRequestHandler:微信请求处理类
 
-WeixinResponseEncoder:对微信回复进行编码
+WeixinResponseEncoder:对微信回复编码
+
+SingleResponseEncoder:对微信单一回复编码

weixin4j-server/src/main/java/com/foxinmy/weixin4j/socket/WeixinServerInitializer.java

@@ -28,9 +28,6 @@ public class WeixinServerInitializer extends ChannelInitializer<SocketChannel> {
 
 	public WeixinServerInitializer(Map<String, AesToken> aesTokenMap,
 			WeixinMessageDispatcher messageDispatcher) throws WeixinException {
-		if (aesTokenMap.isEmpty()) {
-			throw new WeixinException("AesToken not be null.");
-		}
 		this.aesTokenMap = aesTokenMap;
 		this.messageDispatcher = messageDispatcher;
 	}