diff --git a/src/main/java/org/redkale/convert/json/JsonCharsWriter.java b/src/main/java/org/redkale/convert/json/JsonCharsWriter.java
deleted file mode 100644
index d753e79ab..000000000
--- a/src/main/java/org/redkale/convert/json/JsonCharsWriter.java
+++ /dev/null
@@ -1,509 +0,0 @@
-/*
- * 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.json;
-
-import java.nio.ByteBuffer;
-import org.redkale.util.Utility;
-
-/**
- *
- * writeTo系列的方法输出的字符不能含特殊字符
- * <p>
- * 详情见: https://redkale.org
- *
- * @author zhangjx
- *
- * @since 2.3.0
- *
- * @deprecated 2.5.0 JDK9以上用byte[]代替char[]会有更好的性能
- */
-@Deprecated(since = "2.5.0")
-public class JsonCharsWriter extends JsonWriter {
-
-    private static final char[] CHARS_TUREVALUE = "true".toCharArray();
-
-    private static final char[] CHARS_FALSEVALUE = "false".toCharArray();
-
-    private static final int TENTHOUSAND_MAX = 10001;
-
-    private static final char[][] TENTHOUSAND_BYTES = new char[TENTHOUSAND_MAX][];
-
-    static {
-        for (int i = 0; i < TENTHOUSAND_BYTES.length; i++) {
-            TENTHOUSAND_BYTES[i] = String.valueOf(i).toCharArray();
-        }
-    }
-
-    private int count;
-
-    private char[] content;
-
-    public JsonCharsWriter() {
-        this(defaultSize);
-    }
-
-    public JsonCharsWriter(int size) {
-        this.content = new char[size > 1024 ? size : 1024];
-    }
-
-    //-----------------------------------------------------------------------
-    /**
-     * 返回指定至少指定长度的缓冲区
-     *
-     * @param len
-     *
-     * @return
-     */
-    private char[] expand(int len) {
-        int newcount = count + len;
-        if (newcount <= content.length) {
-            return content;
-        }
-        char[] newdata = new char[Math.max(content.length * 3 / 2, newcount)];
-        System.arraycopy(content, 0, newdata, 0, count);
-        this.content = newdata;
-        return newdata;
-    }
-
-    @Override
-    public void writeTo(final char ch) { //只能是 0 - 127 的字符
-        expand(1);
-        content[count++] = ch;
-    }
-
-    @Override
-    public void writeTo(final char[] chs, final int start, final int len) { //只能是 0 - 127 的字符
-        expand(len);
-        System.arraycopy(chs, start, content, count, len);
-        count += len;
-    }
-
-    @Override
-    public void writeTo(final byte ch) { //只能是 0 - 127 的字符
-        expand(1);
-        content[count++] = (char) ch;
-    }
-
-    @Override
-    public void writeTo(final byte[] chs, final int start, final int len) { //只能是 0 - 127 的字符
-        expand(len);
-        for (int i = 0; i < len; i++) {
-            content[count + i] = (char) chs[start + i];
-        }
-        count += len;
-    }
-
-    /**
-     * <b>注意：</b> 该String值不能为null且不会进行转义， 只用于不含需要转义字符的字符串，例如enum、double、BigInteger、BigDecimal转换的String
-     *
-     * @param quote 是否加双引号
-     * @param value 非null且不含需要转义的字符的String值
-     */
-    @Override
-    public void writeLatin1To(final boolean quote, final String value) {
-        if (value == null) {
-            writeNull();
-            return;
-        }
-        int len = value.length();
-        expand(len + (quote ? 2 : 0));
-        if (quote) {
-            content[count++] = '"';
-        }
-        value.getChars(0, len, content, count);
-        count += len;
-        if (quote) {
-            content[count++] = '"';
-        }
-    }
-
-    @Override
-    public void writeFieldShortValue(final byte[] fieldBytes, final short value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-    }
-
-    @Override
-    public void writeFieldIntValue(final byte[] fieldBytes, final int value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-    }
-
-    @Override
-    public void writeFieldLongValue(final byte[] fieldBytes, final long value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-    }
-
-    @Override
-    public void writeFieldLatin1Value(final byte[] fieldBytes, final String value) {
-        int len1 = fieldBytes.length;
-        int len2 = value.length();
-        expand(len1 + len2 + 2);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        content[count++] = '"';
-        value.getChars(0, len2, content, count);
-        count += len2;
-        content[count++] = '"';
-    }
-
-    @Override
-    public void writeLastFieldShortValue(final byte[] fieldBytes, final short value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2 + 1);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-        content[count++] = '}';
-    }
-
-    @Override
-    public void writeLastFieldIntValue(final byte[] fieldBytes, final int value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2 + 1);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-        content[count++] = '}';
-    }
-
-    @Override
-    public void writeLastFieldLongValue(final byte[] fieldBytes, final long value) {
-        String val = String.valueOf(value);
-        int len1 = fieldBytes.length;
-        int len2 = val.length();
-        expand(len1 + len2 + 1);
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) fieldBytes[i];
-        }
-        count += len1;
-        val.getChars(0, len2, content, count);
-        count += len2;
-        content[count++] = '}';
-    }
-
-    @Override
-    public void writeLastFieldLatin1Value(final byte[] fieldBytes, final String value) {
-        if (value == null && nullable()) {
-            writeTo(fieldBytes);
-            writeNull();
-            writeTo('}');
-            return;
-        }
-        if (value == null || (tiny && value.isEmpty())) {
-            expand(1);
-            content[count++] = '}';
-        } else {
-            int len1 = fieldBytes.length;
-            int len2 = value.length();
-            expand(len1 + len2 + 3);
-            for (int i = 0; i < len1; i++) {
-                content[count + i] = (char) fieldBytes[i];
-            }
-            count += len1;
-            content[count++] = '"';
-            value.getChars(0, len2, content, count);
-            count += len2;
-            content[count++] = '"';
-            content[count++] = '}';
-        }
-    }
-
-    @Override //firstFieldBytes 必须带{开头
-    public void writeObjectByOnlyOneLatin1FieldValue(final byte[] firstFieldBytes, final String value) {
-        if (value == null && nullable()) {
-            writeTo('{');
-            writeTo(firstFieldBytes);
-            writeNull();
-            writeTo('}');
-            return;
-        }
-        if (value == null || (tiny && value.isEmpty())) {
-            expand(2);
-            content[count++] = '{';
-            content[count++] = '}';
-        } else {
-            byte[] fieldBytes = firstFieldBytes;
-            int len1 = fieldBytes.length;
-            int len2 = value.length();
-            expand(len1 + len2 + 3);
-            for (int i = 0; i < len1; i++) {
-                content[count + i] = (char) fieldBytes[i];
-            }
-            count += len1;
-            content[count++] = '"';
-            value.getChars(0, len2, content, count);
-            count += len2;
-            content[count++] = '"';
-            content[count++] = '}';
-        }
-    }
-
-    @Override //firstFieldBytes 必须带{开头, lastFieldBytes必须,开头
-    public void writeObjectByOnlyTwoIntFieldValue(final byte[] firstFieldBytes, final int value1, final byte[] lastFieldBytes, final int value2) {
-        String val1 = String.valueOf(value1);
-        String val2 = String.valueOf(value2);
-        int len1 = firstFieldBytes.length;
-        int len2 = val1.length();
-        int len3 = lastFieldBytes.length;
-        int len4 = val2.length();
-        expand(len1 + len2 + len3 + len4 + 1);
-
-        for (int i = 0; i < len1; i++) {
-            content[count + i] = (char) firstFieldBytes[i];
-        }
-        count += len1;
-        val1.getChars(0, len2, content, count);
-        count += len2;
-
-        for (int i = 0; i < len3; i++) {
-            content[count + i] = (char) lastFieldBytes[i];
-        }
-        count += len3;
-        val2.getChars(0, len4, content, count);
-        count += len4;
-
-        content[count++] = '}';
-    }
-
-    @Override
-    protected boolean recycle() {
-        super.recycle();
-        this.count = 0;
-        this.specificObjectType = null;
-        if (this.content != null && this.content.length > defaultSize) {
-            this.content = new char[defaultSize];
-        }
-        return true;
-    }
-
-    public ByteBuffer[] toBuffers() {
-        return new ByteBuffer[]{ByteBuffer.wrap(Utility.encodeUTF8(content, 0, count))};
-    }
-
-    public byte[] toBytes() {
-        return Utility.encodeUTF8(content, 0, count);
-    }
-
-    public int count() {
-        return this.count;
-    }
-
-    @Override
-    public void writeString(String value) {
-        writeString(true, value);
-    }
-
-    @Override
-    public void writeString(final boolean quote, String value) {
-        if (value == null) {
-            writeNull();
-            return;
-        }
-        expand(value.length() * 2 + 2);
-        if (quote) {
-            content[count++] = '"';
-        }
-        for (char ch : Utility.charArray(value)) {
-            switch (ch) {
-                case '\n':
-                    content[count++] = '\\';
-                    content[count++] = 'n';
-                    break;
-                case '\r':
-                    content[count++] = '\\';
-                    content[count++] = 'r';
-                    break;
-                case '\t':
-                    content[count++] = '\\';
-                    content[count++] = 't';
-                    break;
-                case '\\':
-                    content[count++] = '\\';
-                    content[count++] = ch;
-                    break;
-                case '"':
-                    content[count++] = '\\';
-                    content[count++] = ch;
-                    break;
-                default:
-                    content[count++] = ch;
-                    break;
-            }
-        }
-        if (quote) {
-            content[count++] = '"';
-        }
-    }
-
-    @Override
-    public String toString() {
-        return new String(content, 0, count);
-    }
-
-    //----------------------------------------------------------------------------------------------
-    @Override
-    public void writeBoolean(boolean value) {
-        writeTo(value ? CHARS_TUREVALUE : CHARS_FALSEVALUE);
-    }
-
-    @Override
-    public void writeInt(int value) {
-        if (value >= 0 && value < TENTHOUSAND_MAX) {
-            writeTo(TENTHOUSAND_BYTES[value]);
-            return;
-        }
-        final char sign = value >= 0 ? 0 : '-';
-        if (value < 0) {
-            value = -value;
-        }
-        int size;
-        for (int i = 0;; i++) {
-            if (value <= sizeTable[i]) {
-                size = i + 1;
-                break;
-            }
-        }
-        if (sign != 0) {
-            size++; //负数
-        }
-        expand(size);
-
-        int q, r;
-        int charPos = count + size;
-
-        // Generate two digits per iteration
-        while (value >= 65536) {
-            q = value / 100;
-            // really: r = i - (q * 100);
-            r = value - ((q << 6) + (q << 5) + (q << 2));
-            value = q;
-            content[--charPos] = DigitOnes[r];
-            content[--charPos] = DigitTens[r];
-        }
-
-        // Fall thru to fast mode for smaller numbers
-        // assert(i <= 65536, i);
-        for (;;) {
-            q = (value * 52429) >>> (16 + 3);
-            r = value - ((q << 3) + (q << 1));  // r = i-(q*10) ...
-            content[--charPos] = digits[r];
-            value = q;
-            if (value == 0) {
-                break;
-            }
-        }
-        if (sign != 0) {
-            content[--charPos] = sign;
-        }
-        count += size;
-    }
-
-    @Override
-    public void writeLong(long value) {
-        if (value >= 0 && value < TENTHOUSAND_MAX) {
-            writeTo(TENTHOUSAND_BYTES[(int) value]);
-            return;
-        }
-        final char sign = value >= 0 ? 0 : '-';
-        if (value < 0) {
-            value = -value;
-        }
-        int size = 19;
-        long p = 10;
-        for (int i = 1; i < 19; i++) {
-            if (value < p) {
-                size = i;
-                break;
-            }
-            p = 10 * p;
-        }
-        if (sign != 0) {
-            size++; //负数
-        }
-        expand(size);
-
-        long q;
-        int r;
-        int charPos = count + size;
-
-        // Get 2 digits/iteration using longs until quotient fits into an int
-        while (value > Integer.MAX_VALUE) {
-            q = value / 100;
-            // really: r = i - (q * 100);
-            r = (int) (value - ((q << 6) + (q << 5) + (q << 2)));
-            value = q;
-            content[--charPos] = DigitOnes[r];
-            content[--charPos] = DigitTens[r];
-        }
-
-        // Get 2 digits/iteration using ints
-        int q2;
-        int i2 = (int) value;
-        while (i2 >= 65536) {
-            q2 = i2 / 100;
-            // really: r = i2 - (q * 100);
-            r = i2 - ((q2 << 6) + (q2 << 5) + (q2 << 2));
-            i2 = q2;
-            content[--charPos] = DigitOnes[r];
-            content[--charPos] = DigitTens[r];
-        }
-
-        // Fall thru to fast mode for smaller numbers
-        // assert(i2 <= 65536, i2);
-        for (;;) {
-            q2 = (i2 * 52429) >>> (16 + 3);
-            r = i2 - ((q2 << 3) + (q2 << 1));  // r = i2-(q2*10) ...
-            content[--charPos] = digits[r];
-            i2 = q2;
-            if (i2 == 0) {
-                break;
-            }
-        }
-        if (sign != 0) {
-            content[--charPos] = sign;
-        }
-        count += size;
-    }
-
-}