diff --git a/README.md b/README.md
index 088b9d3..bf2659b 100644
--- a/README.md
+++ b/README.md
@@ -40,13 +40,15 @@ XXL-TOOL 是一个Java工具类库，致力于让Java开发更高效。包含
模块 | 说明
--- | ---
Core模块 | 包含集合、缓存、日期……等基础组件工具
-Excel模块 | 一个灵活的Java对象和Excel文档相互转换的工具。一行代码完成Java对象和Excel之间的转换
Gson模块 | json序列化、反序列化工具封装，基于Gson
-Json模块 | json序列化、反序列化自研工具
+Json模块 | json序列化、反序列化自研工具
Response模块 | 统一响应数据结构体，标准化数据结构、状态码等，降低协作成本
Pipeline模块 | 高扩展性流程编排引擎
+Excel模块 | 一个灵活的Java对象和Excel文档相互转换的工具。一行代码完成Java对象和Excel之间的转换
Emoji模块 | 一个灵活可扩展的Emoji表情编解码库，可快速实现Emoji表情的编解码
Fiber模块 | Java协程库，基于quasar封装实现
+Freemarker模块 | 模板引擎工具，支持根据模板文件生成文本、生成文件…等。
+IO模块 | 一系列处理IO（输入/输出）操作的工具类及方法。
... | ...
diff --git "a/doc/XXL-TOOL\345\256\230\346\226\271\346\226\207\346\241\243.md" "b/doc/XXL-TOOL\345\256\230\346\226\271\346\226\207\346\241\243.md"
index 5eb54e8..eb9d652 100644
--- "a/doc/XXL-TOOL\345\256\230\346\226\271\346\226\207\346\241\243.md"
+++ "b/doc/XXL-TOOL\345\256\230\346\226\271\346\226\207\346\241\243.md"
@@ -28,6 +28,7 @@ Excel模块 | 一个灵活的Java对象和Excel文档相互转换的工具。一
Emoji模块 | 一个灵活可扩展的Emoji表情编解码库，可快速实现Emoji表情的编解码
Fiber模块 | Java协程库，基于quasar封装实现
Freemarker模块 | 模板引擎工具，支持根据模板文件生成文本、生成文件…等。
+IO模块 | 一系列处理IO（输入/输出）操作的工具类及方法。
... | ...
### 1.4 下载
@@ -417,9 +418,10 @@ logger.info(text);
- 4、新增Freemarker模块，模板引擎工具，支持根据模板文件生成文本、生成文件…等。
### 3.6 v1.3.1 Release Notes[迭代中]
-- 1、现有工具完善，包括：StringTool、GsonTool等；
-- 2、新增工具，包括：FreemarkerTool、CookieTool、PageModel、CacheTool等；
-- 3、完善单测；
+- 1、现有工具完善，包括：StringTool、GsonTool 等；
+- 2、新增多个工具类模块，包括：FreemarkerTool、CookieTool、PageModel、CacheTool、StreamTool 等；
+- 3、工具类单测完善；
+
### TODO LIST
- excel模块
diff --git a/src/main/java/com/xxl/tool/core/AssertTool.java b/src/main/java/com/xxl/tool/core/AssertTool.java
new file mode 100644
index 0000000..e878ce2
--- /dev/null
+++ b/src/main/java/com/xxl/tool/core/AssertTool.java
@@ -0,0 +1,56 @@
+package com.xxl.tool.core;
+
+public class AssertTool {
+
+
+ /**
+ * Assert a boolean expression, throwing an {@code IllegalArgumentException}
+ * if the expression evaluates to {@code false}.
+ * Assert.isTrue(i > 0, "The value must be greater than zero");
+ * @param expression a boolean expression
+ * @param message the exception message to use if the assertion fails
+ * @throws IllegalArgumentException if {@code expression} is {@code false}
+ */
+ public static void isTrue(boolean expression, String message) {
+ if (!expression) {
+ throw new IllegalArgumentException(message);
+ }
+ }
+
+ /**
+ * Assert that an object is {@code null}.
+ *
+ *
+ * Assert.isNull(value, "The value must be null");
+ *
+ *
+ * @param object the object to check
+ * @param message the exception message to use if the assertion fails
+ * @throws IllegalArgumentException if the object is not {@code null}
+ */
+ public static void isNull(Object object, String message) {
+ if (object != null) {
+ throw new IllegalArgumentException(message);
+ }
+ }
+
+
+ /**
+ * Assert that an object is not {@code null}.
+ *
+ *
+ * Assert.notNull(clazz, "The class must not be null");
+ *
+ *
+ * @param object the object to check
+ * @param message the exception message to use if the assertion fails
+ * @throws IllegalArgumentException if the object is {@code null}
+ */
+ public static void notNull(Object object, String message) {
+ if (object == null) {
+ throw new IllegalArgumentException(message);
+ }
+ }
+
+
+}
diff --git a/src/main/java/com/xxl/tool/io/StreamTool.java b/src/main/java/com/xxl/tool/io/StreamTool.java
new file mode 100644
index 0000000..e1105fd
--- /dev/null
+++ b/src/main/java/com/xxl/tool/io/StreamTool.java
@@ -0,0 +1,96 @@
+package com.xxl.tool.io;
+
+import com.xxl.tool.core.AssertTool;
+
+import java.io.*;
+
+public class StreamTool {
+
+ /**
+ * The default buffer size used when copying bytes.
+ */
+ public static final int BUFFER_SIZE = 1024 * 4;
+
+
+ // ---------------------- copy ----------------------
+
+ /**
+ * Copy from InputStream to OutputStream, Closes both streams when done.
+ *
+ * @param in InputStream
+ * @param out OutputStream
+ * @return the number of bytes copied
+ * @throws IOException in case of I/O errors
+ */
+ public static int copy(InputStream in, OutputStream out) throws IOException {
+ AssertTool.notNull(in, "No InputStream specified");
+ AssertTool.notNull(out, "No OutputStream specified");
+
+ try {
+ int byteCount = 0;
+ byte[] buffer = new byte[BUFFER_SIZE];
+ int bytesRead;
+ while ((bytesRead = in.read(buffer)) != -1) {
+ out.write(buffer, 0, bytesRead);
+ byteCount += bytesRead;
+ }
+ out.flush();
+ return byteCount;
+ } finally {
+ close(in);
+ close(out);
+ }
+ }
+
+ /**
+ * Copy from byte array to OutputStream, Closes the stream when done.
+ *
+ * @param in the byte array
+ * @param out OutputStream
+ * @throws IOException in case of I/O errors
+ */
+ public static void copy(byte[] in, OutputStream out) throws IOException {
+ AssertTool.notNull(in, "No input byte array specified");
+ AssertTool.notNull(out, "No OutputStream specified");
+
+ try {
+ out.write(in);
+ }
+ finally {
+ close(out);
+ }
+ }
+
+ /**
+ * Copy the contents of the given InputStream into a new byte array.
+ * Closes the stream when done.
+ * @param in the stream to copy from (may be {@code null} or empty)
+ * @return the new byte array that has been copied to (possibly empty)
+ * @throws IOException in case of I/O errors
+ */
+ public static byte[] copyToByteArray(InputStream in) throws IOException {
+ if (in == null) {
+ return new byte[0];
+ }
+
+ ByteArrayOutputStream out = new ByteArrayOutputStream(BUFFER_SIZE);
+ copy(in, out);
+ return out.toByteArray();
+ }
+
+ /**
+ * Attempt to close the supplied {@link Closeable}, ignore exceptions
+ *
+ * @param closeable the {@code Closeable} to close
+ */
+ private static void close(Closeable closeable) {
+ try {
+ closeable.close();
+ }
+ catch (IOException ex) {
+ // ignore
+ }
+ }
+
+
+}
diff --git a/src/test/java/com/xxl/tool/test/core/AssertToolTest.java b/src/test/java/com/xxl/tool/test/core/AssertToolTest.java
new file mode 100644
index 0000000..d79e6ef
--- /dev/null
+++ b/src/test/java/com/xxl/tool/test/core/AssertToolTest.java
@@ -0,0 +1,21 @@
+package com.xxl.tool.test.core;
+
+import com.xxl.tool.core.AssertTool;
+import com.xxl.tool.core.StringTool;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class AssertToolTest {
+
+ @Test
+ public void isTrueTest() {
+ AssertTool.isTrue(true, "not true");
+ }
+
+ @Test
+ public void isNullTest() {
+ AssertTool.notNull(new Object(), "not null");
+ }
+
+}
diff --git a/src/test/java/com/xxl/tool/test/io/StreamToolTest.java b/src/test/java/com/xxl/tool/test/io/StreamToolTest.java
new file mode 100644
index 0000000..a7a35fe
--- /dev/null
+++ b/src/test/java/com/xxl/tool/test/io/StreamToolTest.java
@@ -0,0 +1,28 @@
+package com.xxl.tool.test.io;
+
+import com.xxl.tool.io.StreamTool;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringBufferInputStream;
+
+public class StreamToolTest {
+ private static final Logger logger = LoggerFactory.getLogger(StreamToolTest.class);
+
+ @Test
+ public void testJson() {
+ try {
+ InputStream inputStream = new ByteArrayInputStream("input".getBytes());
+
+ byte[] result = StreamTool.copyToByteArray(inputStream);
+ logger.info(new String(result));
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+}