diff --git a/README.md b/README.md
index 9d0fcc0f8..c30000238 100644
--- a/README.md
+++ b/README.md
@@ -197,7 +197,7 @@ Hutool欢迎任何人为Hutool添砖加瓦，贡献代码，不过维护者是
 1. 注释完备，尤其每个新增的方法应按照Java文档规范标明方法说明、参数说明、返回值说明等信息，必要时请添加单元测试，如果愿意，也可以加上你的大名。
 2. Hutool的缩进按照Eclipse（~~不要跟我说IDEA多好用，维护者非常懒，学不会~~，IDEA真香，改了Eclipse快捷键后舒服多了）默认（tab）缩进，所以请遵守（不要和我争执空格与tab的问题，这是一个病人的习惯）。
 3. 新加的方法不要使用第三方库的方法，Hutool遵循无依赖原则（除非在extra模块中加方法工具）。
-4. 请pull request到`v6-dev`分支。Hutool在6.x版本后使用了新的分支：`v6-master`是主分支，表示已经发布中央库的版本，这个分支不允许pr，也不允许修改。
+4. 请pull request到`v7-dev`分支。Hutool在7.x版本后使用了新的分支：`v7-master`是主分支，表示已经发布中央库的版本，这个分支不允许pr，也不允许修改。
 
 ### 💞沟通说明
 
diff --git a/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgUtil.java b/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgUtil.java
index 9b0b86b51..aadb67515 100644
--- a/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgUtil.java
+++ b/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgUtil.java
@@ -1727,7 +1727,7 @@ public class ImgUtil {
 	 * @since 3.1.0
 	 */
 	public static void write(final Image image, final File targetFile) throws IORuntimeException {
-		ImgWriter.of(image, FileNameUtil.extName(targetFile)).write(targetFile);
+		ImgWriter.of(image, FileNameUtil.extName(targetFile)).write(targetFile).flush();
 	}
 
 	/**
@@ -1773,7 +1773,8 @@ public class ImgUtil {
 	public static void write(final Image image, final String imageType, final ImageOutputStream output, final float quality) {
 		ImgWriter.of(image, imageType)
 			.setQuality(quality)
-			.write(output);
+			.write(output)
+			.flush();
 	}
 
 	/**
diff --git a/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgWriter.java b/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgWriter.java
index 7133c1004..721fad944 100644
--- a/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgWriter.java
+++ b/hutool-swing/src/main/java/cn/hutool/v7/swing/img/ImgWriter.java
@@ -16,9 +16,9 @@
 
 package cn.hutool.v7.swing.img;
 
-import cn.hutool.v7.core.io.file.FileUtil;
 import cn.hutool.v7.core.io.IORuntimeException;
 import cn.hutool.v7.core.io.IoUtil;
+import cn.hutool.v7.core.io.file.FileUtil;
 import cn.hutool.v7.core.lang.Assert;
 
 import javax.imageio.IIOImage;
@@ -28,7 +28,6 @@ import javax.imageio.ImageWriter;
 import javax.imageio.stream.ImageOutputStream;
 import java.awt.Color;
 import java.awt.Image;
-import java.awt.image.BufferedImage;
 import java.awt.image.ColorModel;
 import java.awt.image.RenderedImage;
 import java.io.File;
@@ -96,9 +95,11 @@ public class ImgWriter implements Flushable {
 	 *
 	 * @param out     写出到的目标流
 	 * @throws IORuntimeException IO异常
+	 * @return this
 	 */
-	public void write(final OutputStream out) throws IORuntimeException {
+	public ImgWriter write(final OutputStream out) throws IORuntimeException {
 		write(ImgUtil.getImageOutputStream(out));
+		return this;
 	}
 
 	/**
@@ -106,8 +107,9 @@ public class ImgWriter implements Flushable {
 	 *
 	 * @param targetFile 目标文件
 	 * @throws IORuntimeException IO异常
+	 * @return this
 	 */
-	public void write(final File targetFile) throws IORuntimeException {
+	public ImgWriter write(final File targetFile) throws IORuntimeException {
 		FileUtil.touch(targetFile);
 		ImageOutputStream out = null;
 		try {
@@ -116,14 +118,16 @@ public class ImgWriter implements Flushable {
 		} finally {
 			IoUtil.closeQuietly(out);
 		}
+		return this;
 	}
 
 	/**
 	 * 通过{@link ImageWriter}写出图片到输出流
 	 *
 	 * @param output 输出的Image流{@link ImageOutputStream}， 非空
+	 * @return this
 	 */
-	public void write(final ImageOutputStream output) {
+	public ImgWriter write(final ImageOutputStream output) {
 		Assert.notNull(output);
 
 		final ImageWriter writer = this.writer;
@@ -145,14 +149,13 @@ public class ImgWriter implements Flushable {
 			// FileCacheImageOutputStream会产生临时文件，此处关闭清除
 			IoUtil.closeQuietly(output);
 		}
+		return this;
 	}
 
 	@Override
 	public void flush() {
 		final RenderedImage renderedImage = this.image;
-		if(renderedImage instanceof BufferedImage){
-			ImgUtil.flush((BufferedImage) renderedImage);
-		} else if(renderedImage instanceof Image){
+		if(renderedImage instanceof Image){
 			ImgUtil.flush((Image) renderedImage);
 		}
 	}