增加BigDecimal的序列化和反序列化

src/org/redkale/convert/ConvertFactory.java

@@ -7,7 +7,7 @@ package org.redkale.convert;
 
 import java.io.File;
 import java.lang.reflect.*;
-import java.math.BigInteger;
+import java.math.*;
 import java.net.*;
 import java.nio.ByteBuffer;
 import java.nio.channels.CompletionHandler;
@@ -89,6 +89,7 @@ public abstract class ConvertFactory<R extends Reader, W extends Writer> {
             this.register(CharSequence.class, CharSequenceSimpledCoder.instance);
             this.register(java.util.Date.class, DateSimpledCoder.instance);
             this.register(BigInteger.class, BigIntegerSimpledCoder.instance);
+            this.register(BigDecimal.class, BigDecimalSimpledCoder.instance);
             this.register(InetAddress.class, InetAddressSimpledCoder.instance);
             this.register(DLong.class, DLongSimpledCoder.instance);
             this.register(Class.class, TypeSimpledCoder.instance);

src/org/redkale/convert/ext/BigDecimalSimpledCoder.java

@@ -0,0 +1,44 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.redkale.convert.ext;
+
+import org.redkale.convert.SimpledCoder;
+import org.redkale.convert.Writer;
+import org.redkale.convert.Reader;
+import java.math.BigDecimal;
+import org.redkale.util.Utility;
+
+/**
+ * BigDecimal 的SimpledCoder实现
+ *
+ * <p>
+ * 详情见: https://redkale.org
+ *
+ * @author zhangjx
+ * @param <R> Reader输入的子类型
+ * @param <W> Writer输出的子类型
+ */
+public final class BigDecimalSimpledCoder<R extends Reader, W extends Writer> extends SimpledCoder<R, W, BigDecimal> {
+
+    public static final BigDecimalSimpledCoder instance = new BigDecimalSimpledCoder();
+
+    @Override
+    public void convertTo(W out, BigDecimal value) {
+        if (value == null) {
+            out.writeNull();
+            return;
+        }
+        out.writeSmallString(value.toString());
+    }
+
+    @Override
+    public BigDecimal convertFrom(R in) {
+        String value = in.readSmallString();
+        if (value == null) return null;
+        return new BigDecimal(Utility.charArray(value));
+    }
+
+}