将VMSConnection模块加入min-dev-java，以支持与VMS进行通信，执行注册、登录等功能

src/main/java/VMSConnection/Encoding/BC_Encoder.java

@@ -0,0 +1,76 @@
+package VMSConnection.Encoding;
+
+import VMSConnection.Utils.ByteHelper;
+
+import java.io.IOException;
+import java.nio.channels.SocketChannel;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 19:47 2021/6/24
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class BC_Encoder {
+    /**
+     * Encode 将消息编码: 加一个长度头
+     * @param message
+     * @return
+     */
+    public static byte[] Encode(byte[] message){
+        byte[] length= ByteHelper.int32ToByteArray(message.length);
+        byte[] pkg=new byte[4+ message.length];
+        System.arraycopy(length,0,pkg,0,4);
+        System.arraycopy(message,0,pkg,4,message.length);
+        return pkg;
+    }
+
+    /**
+     * 解码消息：去掉长度头
+     * @param channel
+     * @return
+     */
+    public static byte[] DecodeTcp(SocketChannel channel){
+        if(!channel.isConnected()){
+            // 重新连接
+            try {
+                System.out.println("DecodeTcp-重新连接: "+channel.getRemoteAddress());
+                channel.connect(channel.getRemoteAddress());
+            } catch (IOException e) {
+                e.printStackTrace();
+                return null;
+            }
+        }
+        System.out.println("start read...");
+        // 读取消息的长度
+        byte[] buf=new byte[4];
+        try {
+            int revL=channel.socket().getInputStream().read(buf);
+//            channel.read(ByteBuffer.wrap(buf));
+            if(revL<0){
+                System.out.println("read len < 0");
+                return null;
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+        int length=ByteHelper.byteArrayToInt32(buf);
+        System.out.println("read 111: "+length);
+        // 读取真正的消息数据
+        byte[] pkg=new byte[length];
+        try {
+            int revL=channel.socket().getInputStream().read(pkg);
+            if(revL<0){
+                System.out.println("read len < 0");
+                return null;
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+        System.out.println("read 222: "+new String(pkg));
+        return pkg;
+    }
+}