fix code

hutool-json/src/main/java/org/dromara/hutool/json/InternalJSONUtil.java

@@ -32,8 +32,6 @@ import org.dromara.hutool.core.util.ObjUtil;
 import org.dromara.hutool.json.reader.JSONTokener;
 
 import java.io.IOException;
-import java.io.StringWriter;
-import java.io.Writer;
 import java.math.BigDecimal;
 import java.util.*;
 import java.util.function.Predicate;
@@ -210,7 +208,7 @@ public final class InternalJSONUtil {
 	 * @since 3.3.1
 	 */
 	public static String quote(final CharSequence string, final boolean isWrap) {
-		return quote(string, new StringWriter(), isWrap).toString();
+		return quote(string, new StringBuilder(), isWrap).toString();
 	}
 
 	/**
@@ -219,11 +217,11 @@ public final class InternalJSONUtil {
 	 * JSON字符串中不能包含控制字符和未经转义的引号和反斜杠
 	 *
 	 * @param str    字符串
-	 * @param writer Writer
+	 * @param appendable {@link Appendable}
 	 * @throws IORuntimeException IO异常
 	 */
-	public static void quote(final CharSequence str, final Writer writer) throws IORuntimeException {
+	public static void quote(final CharSequence str, final Appendable appendable) throws IORuntimeException {
-		quote(str, writer, true);
+		quote(str, appendable, true);
 	}
 
 	/**
@@ -232,15 +230,15 @@ public final class InternalJSONUtil {
 	 * JSON字符串中不能包含控制字符和未经转义的引号和反斜杠
 	 *
 	 * @param str    字符串
-	 * @param writer Writer
+	 * @param appendable {@link Appendable}
 	 * @param isWrap 是否使用双引号包装字符串
 	 * @return Writer
 	 * @throws IORuntimeException IO异常
 	 * @since 3.3.1
 	 */
-	public static Writer quote(final CharSequence str, final Writer writer, final boolean isWrap) throws IORuntimeException {
+	public static Appendable quote(final CharSequence str, final Appendable appendable, final boolean isWrap) throws IORuntimeException {
 		try {
-			return _quote(str, writer, isWrap);
+			return _quote(str, appendable, isWrap);
 		} catch (final IOException e) {
 			throw new IORuntimeException(e);
 		}
@@ -337,10 +335,10 @@ public final class InternalJSONUtil {
 	 * @throws IOException IO异常
 	 * @since 3.3.1
 	 */
-	private static Writer _quote(final CharSequence str, final Writer writer, final boolean isWrap) throws IOException {
+	private static Appendable _quote(final CharSequence str, final Appendable writer, final boolean isWrap) throws IOException {
 		if (StrUtil.isEmpty(str)) {
 			if (isWrap) {
-				writer.write("\"\"");
+				writer.append("\"\"");
 			}
 			return writer;
 		}
@@ -348,22 +346,22 @@ public final class InternalJSONUtil {
 		char c; // 当前字符
 		final int len = str.length();
 		if (isWrap) {
-			writer.write('"');
+			writer.append('"');
 		}
 		for (int i = 0; i < len; i++) {
 			c = str.charAt(i);
 			switch (c) {
 				case '\\':
 				case '"':
-					writer.write("\\");
+					writer.append("\\");
-					writer.write(c);
+					writer.append(c);
 					break;
 				default:
-					writer.write(escape(c));
+					writer.append(escape(c));
 			}
 		}
 		if (isWrap) {
-			writer.write('"');
+			writer.append('"');
 		}
 		return writer;
 	}

hutool-json/src/main/java/org/dromara/hutool/json/JSON.java

@@ -19,14 +19,11 @@ package org.dromara.hutool.json;
 import org.dromara.hutool.core.bean.path.BeanPath;
 import org.dromara.hutool.core.convert.ConvertException;
 import org.dromara.hutool.core.convert.Converter;
-import org.dromara.hutool.core.lang.mutable.MutableEntry;
 import org.dromara.hutool.core.util.ObjUtil;
+import org.dromara.hutool.json.writer.JSONWriter;
 
 import java.io.Serializable;
-import java.io.StringWriter;
-import java.io.Writer;
 import java.lang.reflect.Type;
-import java.util.function.Predicate;
 
 /**
  * JSON树模型接口，表示树中的一个节点。实现包括：
@@ -155,20 +152,9 @@ public interface JSON extends Converter, Cloneable, Serializable {
 	 * @throws JSONException 包含非法数抛出此异常
 	 */
 	default String toJSONString(final int indentFactor) throws JSONException {
-		final StringWriter sw = new StringWriter();
+		final JSONWriter jsonWriter = JSONWriter.of(new StringBuilder(), indentFactor, 0, config());
-		return this.write(sw, indentFactor, 0, null).toString();
+		this.write(jsonWriter);
-	}
+		return jsonWriter.toString();
-
-	/**
-	 * 将JSON内容写入Writer，无缩进<br>
-	 * Warning: This method assumes that the data structure is acyclical.
-	 *
-	 * @param writer Writer
-	 * @return Writer
-	 * @throws JSONException JSON相关异常
-	 */
-	default Writer write(final Writer writer) throws JSONException {
-		return this.write(writer, 0, 0, null);
 	}
 
 	/**
@@ -176,13 +162,9 @@ public interface JSON extends Converter, Cloneable, Serializable {
 	 * Warning: This method assumes that the data structure is acyclical.
 	 *
 	 * @param writer       writer
-	 * @param indentFactor 缩进因子，定义每一级别增加的缩进量
-	 * @param indent       本级别缩进量
-	 * @param predicate    过滤器，可以修改值，key（index）无法修改，{@link Predicate#test(Object)}为{@code true}保留
-	 * @return Writer
 	 * @throws JSONException JSON相关异常
 	 */
-	Writer write(Writer writer, int indentFactor, int indent, final Predicate<MutableEntry<Object, Object>> predicate) throws JSONException;
+	void write(JSONWriter writer) throws JSONException;
 
 	/**
 	 * 转为实体类对象

hutool-json/src/main/java/org/dromara/hutool/json/JSONArray.java

@@ -29,8 +29,6 @@ import org.dromara.hutool.json.mapper.JSONArrayMapper;
 import org.dromara.hutool.json.mapper.JSONValueMapper;
 import org.dromara.hutool.json.writer.JSONWriter;
 
-import java.io.StringWriter;
-import java.io.Writer;
 import java.util.*;
 import java.util.function.Predicate;
 
@@ -564,20 +562,17 @@ public class JSONArray implements JSON, JSONGetter<Integer>, List<Object>, Rando
 	 * @since 5.7.15
 	 */
 	public String toJSONString(final int indentFactor, final Predicate<MutableEntry<Object, Object>> predicate) {
-		final StringWriter sw = new StringWriter();
+		final JSONWriter jsonWriter = JSONWriter.of(new StringBuilder(), indentFactor, 0, this.config).setPredicate(predicate);
-		synchronized (sw.getBuffer()) {
+		this.write(jsonWriter);
-			return this.write(sw, indentFactor, 0, predicate).toString();
+		return jsonWriter.toString();
-		}
 	}
 
 	@Override
-	public Writer write(final Writer writer, final int indentFactor, final int indent, final Predicate<MutableEntry<Object, Object>> predicate) throws JSONException {
+	public void write(final JSONWriter writer) throws JSONException {
-		final JSONWriter jsonWriter = JSONWriter.of(writer, indentFactor, indent, config).beginArray();
+		final JSONWriter copyWriter = writer.copyOf();
-
+		copyWriter.beginArray();
-		CollUtil.forEach(this, (value, index) -> jsonWriter.writeField(new MutableEntry<>(index, value), predicate));
+		CollUtil.forEach(this, (value, index) -> copyWriter.writeField(new MutableEntry<>(index, value)));
-		jsonWriter.end();
+		copyWriter.end();
-		// 此处不关闭Writer，考虑writer后续还需要填内容
-		return writer;
 	}
 
 	@Override

hutool-json/src/main/java/org/dromara/hutool/json/JSONObject.java

@@ -22,9 +22,6 @@ import org.dromara.hutool.core.map.MapWrapper;
 import org.dromara.hutool.core.util.ObjUtil;
 import org.dromara.hutool.json.writer.JSONWriter;
 
-import java.io.Writer;
-import java.util.function.Predicate;
-
 public class JSONObject extends MapWrapper<String, JSON> implements JSON{
 
 	/**
@@ -71,12 +68,9 @@ public class JSONObject extends MapWrapper<String, JSON> implements JSON{
 	}
 
 	@Override
-	public Writer write(final Writer writer, final int indentFactor, final int indent, final Predicate<MutableEntry<Object, Object>> predicate) throws JSONException {
+	public void write(final JSONWriter writer) throws JSONException {
-		final JSONWriter jsonWriter = JSONWriter.of(writer, indentFactor, indent, config)
+		writer.beginObj();
-			.beginObj();
+		this.forEach((key, value) -> writer.writeField(new MutableEntry<>(key, value)));
-		this.forEach((key, value) -> jsonWriter.writeField(new MutableEntry<>(key, value), predicate));
+		writer.end();
-		jsonWriter.end();
-		// 此处不关闭Writer，考虑writer后续还需要填内容
-		return writer;
 	}
 }

hutool-json/src/main/java/org/dromara/hutool/json/JSONPrimitive.java

@@ -17,15 +17,11 @@
 package org.dromara.hutool.json;
 
 import org.dromara.hutool.core.lang.Assert;
-import org.dromara.hutool.core.lang.mutable.MutableEntry;
 import org.dromara.hutool.json.writer.JSONWriter;
 import org.dromara.hutool.json.writer.ValueWriter;
 import org.dromara.hutool.json.writer.ValueWriterManager;
 
-import java.io.StringWriter;
-import java.io.Writer;
 import java.lang.reflect.Type;
-import java.util.function.Predicate;
 
 /**
  * JSON原始类型数据封装，根据RFC8259规范，JSONPrimitive只包含以下类型：
@@ -114,25 +110,22 @@ public class JSONPrimitive implements JSON {
 	}
 
 	@Override
-	public Writer write(final Writer writer, final int indentFactor, final int indent, final Predicate<MutableEntry<Object, Object>> predicate) throws JSONException {
+	public void write(final JSONWriter writer) throws JSONException {
-		final Object value = this.value;
-		final JSONWriter jsonWriter = JSONWriter.of(writer, indentFactor, indent, config);
-
 		// 自定义规则
 		final ValueWriter valueWriter = ValueWriterManager.getInstance().get(value);
 		if (null != valueWriter) {
-			valueWriter.write(jsonWriter, value);
+			valueWriter.write(writer, value);
-			return writer;
+			return;
 		}
 
 		// 默认包装字符串
-		jsonWriter.writeQuoteStrValue(value.toString());
+		writer.writeQuoteStrValue(value.toString());
-		return writer;
 	}
 
 	@Override
 	public String toString() {
-		final StringWriter sw = new StringWriter();
+		final JSONWriter jsonWriter = JSONWriter.of(new StringBuilder(), 0, 0, this.config);
-		return this.write(sw, 0, 0, null).toString();
+		write(jsonWriter);
+		return jsonWriter.toString();
 	}
 }

hutool-json/src/main/java/org/dromara/hutool/json/JSONUtil.java

@@ -285,7 +285,7 @@ public class JSONUtil {
 	 */
 	public static void toJsonStr(final Object obj, final Writer writer) {
 		if (null != obj) {
-			parse(obj).write(writer);
+			parse(obj).write(JSONWriter.of(writer, 0, 0, null));
 		}
 	}
 

hutool-json/src/main/java/org/dromara/hutool/json/OldJSONObject.java

@@ -29,8 +29,6 @@ import org.dromara.hutool.json.mapper.JSONObjectMapper;
 import org.dromara.hutool.json.mapper.JSONValueMapper;
 import org.dromara.hutool.json.writer.JSONWriter;
 
-import java.io.StringWriter;
-import java.io.Writer;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.Arrays;
@@ -436,32 +434,17 @@ public class OldJSONObject extends MapWrapper<String, Object> implements JSON, J
 	 * @since 5.7.15
 	 */
 	public String toJSONString(final int indentFactor, final Predicate<MutableEntry<Object, Object>> predicate) {
-		final StringWriter sw = new StringWriter();
+		final JSONWriter jsonWriter = JSONWriter.of(new StringBuilder(), indentFactor, 0, config).setPredicate(predicate);
-		synchronized (sw.getBuffer()) {
+		write(jsonWriter);
-			return this.write(sw, indentFactor, 0, predicate).toString();
+		return jsonWriter.toString();
-		}
 	}
 
-	/**
-	 * 将JSON内容写入Writer<br>
-	 * 支持过滤器，即选择哪些字段或值不写出
-	 *
-	 * @param writer       writer
-	 * @param indentFactor 缩进因子，定义每一级别增加的缩进量
-	 * @param indent       本级别缩进量
-	 * @param predicate    过滤器，同时可以修改编辑键和值
-	 * @return Writer
-	 * @throws JSONException JSON相关异常
-	 * @since 5.7.15
-	 */
 	@Override
-	public Writer write(final Writer writer, final int indentFactor, final int indent, final Predicate<MutableEntry<Object, Object>> predicate) throws JSONException {
+	public void write(final JSONWriter writer) throws JSONException {
-		final JSONWriter jsonWriter = JSONWriter.of(writer, indentFactor, indent, config)
+		final JSONWriter copyWriter = writer.copyOf();
-			.beginObj();
+		copyWriter.beginObj();
-		this.forEach((key, value) -> jsonWriter.writeField(new MutableEntry<>(key, value), predicate));
+		this.forEach((key, value) -> copyWriter.writeField(new MutableEntry<>(key, value)));
-		jsonWriter.end();
+		copyWriter.end();
-		// 此处不关闭Writer，考虑writer后续还需要填内容
-		return writer;
 	}
 
 	@Override

hutool-json/src/main/java/org/dromara/hutool/json/engine/HutoolJSONEngine.java

@@ -20,6 +20,7 @@ import org.dromara.hutool.core.util.ObjUtil;
 import org.dromara.hutool.json.JSON;
 import org.dromara.hutool.json.JSONConfig;
 import org.dromara.hutool.json.JSONUtil;
+import org.dromara.hutool.json.writer.JSONWriter;
 
 import java.io.Reader;
 import java.io.Writer;
@@ -39,7 +40,11 @@ public class HutoolJSONEngine extends AbstractJSONEngine {
 	public void serialize(final Object bean, final Writer writer) {
 		initEngine();
 		final JSON json = JSONUtil.parse(bean, this.hutoolSJONConfig);
-		json.write(writer, ObjUtil.defaultIfNull(this.config, JSONEngineConfig::isPrettyPrint, false) ? 2 : 0, 0, null);
+		final JSONWriter jsonWriter = JSONWriter.of(writer,
+			ObjUtil.defaultIfNull(this.config, JSONEngineConfig::isPrettyPrint, false) ? 2 : 0,
+			0,
+			this.hutoolSJONConfig);
+		json.write(jsonWriter);
 	}
 
 	@Override

hutool-json/src/main/java/org/dromara/hutool/json/writer/JSONWriter.java

@@ -25,6 +25,8 @@ import org.dromara.hutool.json.InternalJSONUtil;
 import org.dromara.hutool.json.JSON;
 import org.dromara.hutool.json.JSONConfig;
 
+import java.io.Closeable;
+import java.io.Flushable;
 import java.io.IOException;
 import java.io.Writer;
 import java.util.function.Predicate;
@@ -36,24 +38,40 @@ import java.util.function.Predicate;
  * @author looly
  * @since 5.7.3
  */
-public class JSONWriter extends Writer {
+public class JSONWriter implements Appendable, Flushable, Closeable {
+
+	/**
+	 * 创建JSONWriter
+	 *
+	 * @param appendable   {@link Appendable}
+	 * @param indentFactor 缩进因子，定义每一级别增加的缩进量
+	 * @param indent       本级别缩进量
+	 * @param config       JSON选项
+	 * @return JSONWriter
+	 */
+	public static JSONWriter of(final Appendable appendable, final int indentFactor, final int indent,
+								final JSONConfig config) {
+		return new JSONWriter(appendable, indentFactor, indent, config);
+	}
+
+	/**
+	 * Writer
+	 */
+	private final Appendable appendable;
+	/**
+	 * JSON选项
+	 */
+	private final JSONConfig config;
 
 	/**
 	 * 缩进因子，定义每一级别增加的缩进量
 	 */
 	private final int indentFactor;
 	/**
-	 * 本级别缩进量
+	 * 键值对过滤器，用于修改键值对
 	 */
-	private final int indent;
+	private Predicate<MutableEntry<Object, Object>> predicate;
-	/**
+
-	 * Writer
-	 */
-	private final Writer writer;
-	/**
-	 * JSON选项
-	 */
-	private final JSONConfig config;
 
 	/**
 	 * 写出当前值是否需要分隔符
@@ -63,33 +81,35 @@ public class JSONWriter extends Writer {
 	 * 是否为JSONArray模式
 	 */
 	private boolean arrayMode;
-
 	/**
-	 * 创建JSONWriter
+	 * 本级别缩进量
-	 *
-	 * @param writer       {@link Writer}
-	 * @param indentFactor 缩进因子，定义每一级别增加的缩进量
-	 * @param indent       本级别缩进量
-	 * @param config       JSON选项
-	 * @return JSONWriter
 	 */
-	public static JSONWriter of(final Writer writer, final int indentFactor, final int indent, final JSONConfig config) {
+	private int indent;
-		return new JSONWriter(writer, indentFactor, indent, config);
-	}
 
 	/**
 	 * 构造
 	 *
-	 * @param writer       {@link Writer}
+	 * @param appendable   {@link Appendable}
 	 * @param indentFactor 缩进因子，定义每一级别增加的缩进量
 	 * @param indent       本级别缩进量
 	 * @param config       JSON选项
 	 */
-	public JSONWriter(final Writer writer, final int indentFactor, final int indent, final JSONConfig config) {
+	public JSONWriter(final Appendable appendable, final int indentFactor, final int indent, final JSONConfig config) {
-		this.writer = writer;
+		this.appendable = appendable;
 		this.indentFactor = indentFactor;
 		this.indent = indent;
-		this.config = ObjUtil.defaultIfNull(config, JSONConfig.of());
+		this.config = ObjUtil.defaultIfNull(config, JSONConfig::of);
+	}
+
+	/**
+	 * 设置键值对过滤器，用于修改键值对
+	 *
+	 * @param predicate 键值对过滤器，用于修改键值对
+	 * @return this
+	 */
+	public JSONWriter setPredicate(final Predicate<MutableEntry<Object, Object>> predicate) {
+		this.predicate = predicate;
+		return this;
 	}
 
 	/**
@@ -101,14 +121,26 @@ public class JSONWriter extends Writer {
 		return this.config;
 	}
 
+	/**
+	 * 复制当前对象，用于修改配置后写出
+	 * @return JSONWriter
+	 */
+	@SuppressWarnings("resource")
+	public JSONWriter copyOf() {
+		return new JSONWriter(this.appendable, this.indentFactor, this.indent, this.config)
+			.setPredicate(this.predicate);
+	}
+
 	/**
 	 * JSONObject写出开始，默认写出"{"
 	 *
 	 * @return this
 	 */
+	@SuppressWarnings("resource")
 	public JSONWriter beginObj() {
-		//noinspection resource
+		append(CharUtil.DELIM_START);
-		writeRaw(CharUtil.DELIM_START);
+		arrayMode = false;
+		needSeparator = false;
 		return this;
 	}
 
@@ -117,10 +149,11 @@ public class JSONWriter extends Writer {
 	 *
 	 * @return this
 	 */
+	@SuppressWarnings("resource")
 	public JSONWriter beginArray() {
-		//noinspection resource
+		append(CharUtil.BRACKET_START);
-		writeRaw(CharUtil.BRACKET_START);
 		arrayMode = true;
+		needSeparator = false;
 		return this;
 	}
 
@@ -129,12 +162,11 @@ public class JSONWriter extends Writer {
 	 *
 	 * @return this
 	 */
+	@SuppressWarnings("resource")
 	public JSONWriter end() {
 		// 换行缩进
-		//noinspection resource
 		writeLF().writeSpace(indent);
-		//noinspection resource
+		append(arrayMode ? CharUtil.BRACKET_END : CharUtil.DELIM_END);
-		writeRaw(arrayMode ? CharUtil.BRACKET_END : CharUtil.DELIM_END);
 		flush();
 		arrayMode = false;
 		// 当前对象或数组结束，当新的
@@ -147,12 +179,11 @@ public class JSONWriter extends Writer {
 	 * 在{@link #arrayMode} 为 {@code true} 时，key是数字，此时不写出键，只写值
 	 *
 	 * @param pair      键值对
-	 * @param predicate 过滤修改器
 	 * @return this
 	 * @since 6.0.0
 	 */
-	@SuppressWarnings({"UnusedReturnValue", "resource"})
+	@SuppressWarnings("resource")
-	public JSONWriter writeField(final MutableEntry<Object, Object> pair, final Predicate<MutableEntry<Object, Object>> predicate) {
+	public JSONWriter writeField(final MutableEntry<Object, Object> pair) {
 		if (null == pair.getValue() && config.isIgnoreNullValue()) {
 			return this;
 		}
@@ -169,7 +200,7 @@ public class JSONWriter extends Writer {
 			writeKey(StrUtil.toString(pair.getKey()));
 		}
 
-		return writeValueDirect(pair.getValue(), predicate);
+		return writeValueDirect(pair.getValue());
 	}
 
 	/**
@@ -178,35 +209,36 @@ public class JSONWriter extends Writer {
 	 * @param key 键名
 	 * @return this
 	 */
-	@SuppressWarnings({"resource", "UnusedReturnValue"})
+	@SuppressWarnings("resource")
 	public JSONWriter writeKey(final String key) {
 		if (needSeparator) {
-			//noinspection resource
+			append(CharUtil.COMMA);
-			writeRaw(CharUtil.COMMA);
 		}
 		// 换行缩进
 		writeLF().writeSpace(indentFactor + indent);
 		return writeRaw(InternalJSONUtil.quote(key));
 	}
 
-	@SuppressWarnings({"SpellCheckingInspection", "NullableProblems"})
-	@Override
-	public void write(final char[] cbuf, final int off, final int len) throws IOException {
-		this.writer.write(cbuf, off, len);
-	}
-
 	@Override
 	public void flush() {
+		if (this.appendable instanceof Flushable) {
 			try {
-			this.writer.flush();
+				((Flushable) this.appendable).flush();
 			} catch (final IOException e) {
 				throw new IORuntimeException(e);
 			}
 		}
+	}
 
 	@Override
 	public void close() throws IOException {
-		this.writer.close();
+		if (this.appendable instanceof AutoCloseable) {
+			try {
+				((AutoCloseable) this.appendable).close();
+			} catch (final Exception e) {
+				throw new IOException(e);
+			}
+		}
 	}
 
 	/**
@@ -218,7 +250,7 @@ public class JSONWriter extends Writer {
 	 * @param csq 字符串
 	 */
 	public void writeQuoteStrValue(final String csq) {
-		InternalJSONUtil.quote(csq, writer);
+		InternalJSONUtil.quote(csq, this.appendable);
 	}
 
 	/**
@@ -230,7 +262,7 @@ public class JSONWriter extends Writer {
 		if (indentFactor > 0) {
 			for (int i = 0; i < count; i++) {
 				//noinspection resource
-				writeRaw(CharUtil.SPACE);
+				append(CharUtil.SPACE);
 			}
 		}
 	}
@@ -243,7 +275,7 @@ public class JSONWriter extends Writer {
 	public JSONWriter writeLF() {
 		if (indentFactor > 0) {
 			//noinspection resource
-			writeRaw(CharUtil.LF);
+			append(CharUtil.LF);
 		}
 		return this;
 	}
@@ -256,68 +288,84 @@ public class JSONWriter extends Writer {
 	 */
 	public JSONWriter writeRaw(final String csq) {
 		try {
-			writer.append(csq);
+			this.appendable.append(csq);
 		} catch (final IOException e) {
 			throw new IORuntimeException(e);
 		}
 		return this;
 	}
 
-	/**
+	@Override
-	 * 写入原始字符值，不做任何处理
+	public JSONWriter append(final char c) throws IORuntimeException {
-	 *
-	 * @param c 字符
-	 * @return this
-	 */
-	public JSONWriter writeRaw(final char c) {
 		try {
-			writer.write(c);
+			this.appendable.append(c);
 		} catch (final IOException e) {
 			throw new IORuntimeException(e);
 		}
 		return this;
 	}
 
+	@Override
+	public JSONWriter append(final CharSequence csq) throws IORuntimeException {
+		try {
+			this.appendable.append(csq);
+		} catch (final IOException e) {
+			throw new IORuntimeException(e);
+		}
+		return this;
+	}
+
+	@Override
+	public JSONWriter append(final CharSequence csq, final int start, final int end) throws IORuntimeException {
+		try {
+			this.appendable.append(csq, start, end);
+		} catch (final IOException e) {
+			throw new IORuntimeException(e);
+		}
+		return this;
+	}
+
+	@Override
+	public String toString() {
+		return this.appendable.toString();
+	}
+
 	// ------------------------------------------------------------------------------ Private methods
 
 	/**
 	 * 写出值，自动处理分隔符和缩进，自动判断类型，并根据不同类型写出特定格式的值
 	 *
 	 * @param value     值
-	 * @param predicate 过滤修改器
 	 * @return this
 	 */
-	private JSONWriter writeValueDirect(final Object value, final Predicate<MutableEntry<Object, Object>> predicate) {
+	private JSONWriter writeValueDirect(final Object value) {
 		if (arrayMode) {
 			if (needSeparator) {
 				//noinspection resource
-				writeRaw(CharUtil.COMMA);
+				append(CharUtil.COMMA);
 			}
 			// 换行缩进
 			//noinspection resource
 			writeLF().writeSpace(indentFactor + indent);
 		} else {
 			//noinspection resource
-			writeRaw(CharUtil.COLON).writeSpace(1);
+			append(CharUtil.COLON).writeSpace(1);
 		}
 		needSeparator = true;
-		return writeObjValue(value, predicate);
+		return writeObjValue(value);
 	}
 
 	/**
 	 * 写出JSON的值，根据值类型不同，输出不同内容
 	 *
 	 * @param value     值
-	 * @param predicate 过滤修改器
 	 * @return this
 	 */
 	@SuppressWarnings("resource")
-	private JSONWriter writeObjValue(final Object value, final Predicate<MutableEntry<Object, Object>> predicate) {
+	private JSONWriter writeObjValue(final Object value) {
-		final int indent = indentFactor + this.indent;
-
 		// 自定义规则
 		final ValueWriter valueWriter = ValueWriterManager.getInstance().get(value);
-		if(null != valueWriter){
+		if (null != valueWriter) {
 			valueWriter.write(this, value);
 			return this;
 		}
@@ -325,8 +373,8 @@ public class JSONWriter extends Writer {
 		// 默认规则
 		if (value == null) {
 			writeRaw(StrUtil.NULL);
-		}else if (value instanceof JSON) {
+		} else if (value instanceof JSON) {
-			((JSON) value).write(writer, indentFactor, indent, predicate);
+			((JSON) value).write(this);
 		} else {
 			writeQuoteStrValue(value.toString());
 		}