diff --git a/src/org/redkale/convert/DeMember.java b/src/org/redkale/convert/DeMember.java
index 673527a57..67ecb6cab 100644
--- a/src/org/redkale/convert/DeMember.java
+++ b/src/org/redkale/convert/DeMember.java
@@ -5,6 +5,7 @@
  */
 package org.redkale.convert;
 
+import java.lang.reflect.*;
 import org.redkale.util.Attribute;
 
 /**
@@ -33,6 +34,19 @@ public final class DeMember<R extends Reader, T, F> implements Comparable<DeMemb
         this.decoder = decoder;
     }
 
+    public static <R extends Reader, T, F> DeMember<R, T, F> create(final Factory factory, final Class<T> clazz, final String fieldname) {
+        try {
+            Field field = clazz.getDeclaredField(fieldname);
+            return new DeMember<>(Attribute.create(field), factory.loadDecoder(field.getGenericType()));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public final boolean match(String name) {
+        return attribute.field().equals(name);
+    }
+
     public final void read(R in, T obj) {
         this.attribute.set(obj, decoder.convertFrom(in));
     }
diff --git a/src/org/redkale/convert/EnMember.java b/src/org/redkale/convert/EnMember.java
index 9a2635710..2768ec71b 100644
--- a/src/org/redkale/convert/EnMember.java
+++ b/src/org/redkale/convert/EnMember.java
@@ -5,6 +5,7 @@
  */
 package org.redkale.convert;
 
+import java.lang.reflect.*;
 import org.redkale.util.Attribute;
 
 /**
@@ -38,6 +39,19 @@ public final class EnMember<W extends Writer, T, F> implements Comparable<EnMemb
         //this.isnumber = Number.class.isAssignableFrom(t) || (!this.isbool && t.isPrimitive());
     }
 
+    public static <W extends Writer, T, F> EnMember<W, T, F> create(final Factory factory, final Class<T> clazz, final String fieldname) {
+        try {
+            Field field = clazz.getDeclaredField(fieldname);
+            return new EnMember<>(Attribute.create(field), factory.loadEncoder(field.getGenericType()));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public final boolean match(String name) {
+        return attribute.field().equals(name);
+    }
+
     public boolean write(final W out, final boolean comma, final T obj) {
         F value = attribute.get(obj);
         if (value == null) return comma;
diff --git a/src/org/redkale/convert/Factory.java b/src/org/redkale/convert/Factory.java
index 608b5cfbf..4437da54c 100644
--- a/src/org/redkale/convert/Factory.java
+++ b/src/org/redkale/convert/Factory.java
@@ -349,14 +349,15 @@ public abstract class Factory<R extends Reader, W extends Writer> {
             od = new ObjectDecoder(type);
             decoder = od;
         } else if (!clazz.getName().startsWith("java.")) {
-            SimpledCoder simpleCoder = null;
+            Decodeable simpleCoder = null;
             for (final Method method : clazz.getDeclaredMethods()) {
                 if (!Modifier.isStatic(method.getModifiers())) continue;
-                if (method.getParameterTypes().length != 0) continue;
-                if (!SimpledCoder.class.isAssignableFrom(method.getReturnType())) continue;
+                Class[] paramTypes = method.getParameterTypes();
+                if (paramTypes.length != 1 || paramTypes[0] != Factory.class) continue;
+                if (!Decodeable.class.isAssignableFrom(method.getReturnType())) continue;
                 try {
                     method.setAccessible(true);
-                    simpleCoder = (SimpledCoder) method.invoke(null);
+                    simpleCoder = (Decodeable) method.invoke(null, this);
                     break;
                 } catch (Exception e) {
                 }
@@ -427,14 +428,15 @@ public abstract class Factory<R extends Reader, W extends Writer> {
         } else if (clazz == Object.class) {
             return (Encodeable<W, E>) this.anyEncoder;
         } else if (!clazz.getName().startsWith("java.")) {
-            SimpledCoder simpleCoder = null;
+            Encodeable simpleCoder = null;
             for (final Method method : clazz.getDeclaredMethods()) {
                 if (!Modifier.isStatic(method.getModifiers())) continue;
-                if (method.getParameterTypes().length != 0) continue;
-                if (!SimpledCoder.class.isAssignableFrom(method.getReturnType())) continue;
+                Class[] paramTypes = method.getParameterTypes();
+                if (paramTypes.length != 1 || paramTypes[0] != Factory.class) continue;
+                if (!Encodeable.class.isAssignableFrom(method.getReturnType())) continue;
                 try {
                     method.setAccessible(true);
-                    simpleCoder = (SimpledCoder) method.invoke(null);
+                    simpleCoder = (Encodeable) method.invoke(null, this);
                     break;
                 } catch (Exception e) {
                 }
diff --git a/src/org/redkale/convert/json/JsonByteBufferReader.java b/src/org/redkale/convert/json/JsonByteBufferReader.java
index 39b26cca4..e8ce607ee 100644
--- a/src/org/redkale/convert/json/JsonByteBufferReader.java
+++ b/src/org/redkale/convert/json/JsonByteBufferReader.java
@@ -155,7 +155,7 @@ public class JsonByteBufferReader extends JsonReader {
         char ch = nextGoodChar();
         if (ch == ',') return true;
         if (ch == '}' || ch == ']') return false;
-        backChar(ch);
+        backChar(ch); // { [ 交由 readObjectB 或 readMapB 或 readArrayB 读取
         return true;
     }
 
diff --git a/src/org/redkale/convert/json/JsonReader.java b/src/org/redkale/convert/json/JsonReader.java
index 1d6d8aaa2..837066222 100644
--- a/src/org/redkale/convert/json/JsonReader.java
+++ b/src/org/redkale/convert/json/JsonReader.java
@@ -267,7 +267,7 @@ public class JsonReader implements Reader {
             if (ch == ',') return true;
             if (ch == '}' || ch == ']') return false;
         }
-        this.position--;
+        this.position--; // { [ 交由 readObjectB 或 readMapB 或 readArrayB 读取
         return true;
     }