diff --git a/src/org/redkale/net/PrepareServlet.java b/src/org/redkale/net/PrepareServlet.java
index 0319c6766..404376948 100644
--- a/src/org/redkale/net/PrepareServlet.java
+++ b/src/org/redkale/net/PrepareServlet.java
@@ -18,7 +18,7 @@ import java.util.logging.*;
  * @param <R>
  * @param <P>
  */
-public abstract class PrepareServlet<R extends Request, P extends Response<R>> implements Servlet<R, P> {
+public abstract class PrepareServlet<R extends Request, P extends Response<R>> extends Servlet<R, P> {
 
     protected final AtomicLong executeCounter = new AtomicLong(); //执行请求次数
 
diff --git a/src/org/redkale/net/Response.java b/src/org/redkale/net/Response.java
index cf4255ac1..3e41896d6 100644
--- a/src/org/redkale/net/Response.java
+++ b/src/org/redkale/net/Response.java
@@ -188,7 +188,7 @@ public abstract class Response<R extends Request> {
         });
     }
 
-    protected <A> void send(final ByteBuffer[] buffers, A attachment, CompletionHandler<Integer, A> handler) {
+    protected <A> void send(final ByteBuffer[] buffers, A attachment, final CompletionHandler<Integer, A> handler) {
         this.channel.write(buffers, attachment, new CompletionHandler<Integer, A>() {
 
             @Override
@@ -207,9 +207,7 @@ public abstract class Response<R extends Request> {
                     ByteBuffer[] newattachs = new ByteBuffer[buffers.length - index];
                     System.arraycopy(buffers, index, newattachs, 0, newattachs.length);
                     channel.write(newattachs, attachment, this);
-                } else {
-                    if (handler != null) handler.completed(result, attachment);
-                }
+                } else if (handler != null) handler.completed(result, attachment);
             }
 
             @Override
diff --git a/src/org/redkale/net/Servlet.java b/src/org/redkale/net/Servlet.java
index d7cdfe225..c1886353d 100644
--- a/src/org/redkale/net/Servlet.java
+++ b/src/org/redkale/net/Servlet.java
@@ -15,14 +15,14 @@ import java.io.IOException;
  * @param <R>
  * @param <P>
  */
-public interface Servlet<R extends Request, P extends Response<R>> {
+public abstract class Servlet<R extends Request, P extends Response<R>> {
 
-    default void init(Context context, AnyValue config) {
+    public void init(Context context, AnyValue config) {
     }
 
-    public void execute(R request, P response) throws IOException;
+    public abstract void execute(R request, P response) throws IOException;
 
-    default void destroy(Context context, AnyValue config) {
+    public void destroy(Context context, AnyValue config) {
     }
 
 }
diff --git a/src/org/redkale/net/http/HttpServlet.java b/src/org/redkale/net/http/HttpServlet.java
index 74f0a43f4..6b358a009 100644
--- a/src/org/redkale/net/http/HttpServlet.java
+++ b/src/org/redkale/net/http/HttpServlet.java
@@ -13,7 +13,7 @@ import org.redkale.util.*;
  * @see http://www.redkale.org
  * @author zhangjx
  */
-public abstract class HttpServlet implements Servlet<HttpRequest, HttpResponse<HttpRequest>> {
+public abstract class HttpServlet extends Servlet<HttpRequest, HttpResponse<HttpRequest>> {
 
     AnyValue conf; //当前HttpServlet的配置
 
diff --git a/src/org/redkale/net/sncp/SncpServlet.java b/src/org/redkale/net/sncp/SncpServlet.java
index c42d29bc5..824f6b1f0 100644
--- a/src/org/redkale/net/sncp/SncpServlet.java
+++ b/src/org/redkale/net/sncp/SncpServlet.java
@@ -13,7 +13,7 @@ import org.redkale.util.*;
  * @see http://www.redkale.org
  * @author zhangjx
  */
-public abstract class SncpServlet implements Servlet<SncpRequest, SncpResponse> {
+public abstract class SncpServlet extends Servlet<SncpRequest, SncpResponse> {
 
     AnyValue conf;