diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/math/NumberUtil.java b/hutool-core/src/main/java/org/dromara/hutool/core/math/NumberUtil.java
index ec3881378..332d530b3 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/math/NumberUtil.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/math/NumberUtil.java
@@ -638,6 +638,20 @@ public class NumberUtil extends NumberValidator {
 		format.setMaximumFractionDigits(scale);
 		return format.format(number);
 	}
+
+	/**
+	 * 格式化千分位表示方式，小数采用四舍五入方式
+	 *
+	 * @param number 值
+	 * @param scale  保留小数位数
+	 * @return 千分位数字
+	 * @since 6.0.0
+	 */
+	public static String formatThousands(final double number, final int scale) {
+		final NumberFormat format = NumberFormat.getNumberInstance();
+		format.setMaximumFractionDigits(scale);
+		return format.format(number);
+	}
 	// endregion
 
 	// region ----- range
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java
index 044cfcedc..498e1f4c1 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java
@@ -746,4 +746,12 @@ public class NumberUtilTest {
 	void issueI6ZD1RTest() {
 		Assertions.assertFalse(NumberUtil.isInteger("999999999999999"));
 	}
+
+	@Test
+	void formatThousands() {
+		// issue#I7OIA6
+		Assertions.assertEquals(
+			"123,456,789.111111",
+			NumberUtil.formatThousands(123456789.111111D, 6));
+	}
 }
diff --git a/hutool-extra/src/main/java/org/dromara/hutool/extra/ssh/Sftp.java b/hutool-extra/src/main/java/org/dromara/hutool/extra/ssh/Sftp.java
index 338954c45..6c6ae838e 100644
--- a/hutool-extra/src/main/java/org/dromara/hutool/extra/ssh/Sftp.java
+++ b/hutool-extra/src/main/java/org/dromara/hutool/extra/ssh/Sftp.java
@@ -245,6 +245,9 @@ public class Sftp extends AbstractFtp {
 	 * @since 4.1.14
 	 */
 	public ChannelSftp getClient() {
+		if(false == this.channel.isConnected()){
+			init();
+		}
 		return this.channel;
 	}
 
@@ -256,7 +259,7 @@ public class Sftp extends AbstractFtp {
 	@Override
 	public String pwd() {
 		try {
-			return channel.pwd();
+			return getClient().pwd();
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -270,7 +273,7 @@ public class Sftp extends AbstractFtp {
 	 */
 	public String home() {
 		try {
-			return channel.getHome();
+			return getClient().getHome();
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -351,7 +354,7 @@ public class Sftp extends AbstractFtp {
 	public List<LsEntry> lsEntries(final String path, final Predicate<LsEntry> predicate) {
 		final List<LsEntry> entryList = new ArrayList<>();
 		try {
-			channel.ls(path, entry -> {
+			getClient().ls(path, entry -> {
 				final String fileName = entry.getFilename();
 				if (!StrUtil.equals(".", fileName) && !StrUtil.equals("..", fileName)) {
 					if (null == predicate || predicate.test(entry)) {
@@ -376,7 +379,7 @@ public class Sftp extends AbstractFtp {
 			return true;
 		}
 		try {
-			this.channel.mkdir(dir);
+			getClient().mkdir(dir);
 			return true;
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
@@ -387,7 +390,7 @@ public class Sftp extends AbstractFtp {
 	public boolean isDir(final String dir) {
 		final SftpATTRS sftpATTRS;
 		try {
-			sftpATTRS = this.channel.stat(dir);
+			sftpATTRS = getClient().stat(dir);
 		} catch (final SftpException e) {
 			final String msg = e.getMessage();
 			// issue#I4P9ED@Gitee
@@ -415,7 +418,7 @@ public class Sftp extends AbstractFtp {
 			return true;
 		}
 		try {
-			channel.cd(directory.replace('\\', '/'));
+			getClient().cd(directory.replace('\\', '/'));
 			return true;
 		} catch (final SftpException e) {
 			throw new FtpException(e);
@@ -430,7 +433,7 @@ public class Sftp extends AbstractFtp {
 	@Override
 	public boolean delFile(final String filePath) {
 		try {
-			channel.rm(filePath);
+			getClient().rm(filePath);
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -450,6 +453,8 @@ public class Sftp extends AbstractFtp {
 			return false;
 		}
 
+		final ChannelSftp channel = getClient();
+
 		final Vector<LsEntry> list;
 		try {
 			list = channel.ls(channel.pwd());
@@ -576,7 +581,7 @@ public class Sftp extends AbstractFtp {
 	 */
 	public Sftp put(final String srcFilePath, final String destPath, final SftpProgressMonitor monitor, final Mode mode) {
 		try {
-			channel.put(srcFilePath, destPath, monitor, mode.ordinal());
+			getClient().put(srcFilePath, destPath, monitor, mode.ordinal());
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -595,7 +600,7 @@ public class Sftp extends AbstractFtp {
 	 */
 	public Sftp put(final InputStream srcStream, final String destPath, final SftpProgressMonitor monitor, final Mode mode) {
 		try {
-			channel.put(srcStream, destPath, monitor, mode.ordinal());
+			getClient().put(srcStream, destPath, monitor, mode.ordinal());
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -658,7 +663,7 @@ public class Sftp extends AbstractFtp {
 	 */
 	public Sftp get(final String src, final String dest) {
 		try {
-			channel.get(src, dest);
+			getClient().get(src, dest);
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}
@@ -675,7 +680,7 @@ public class Sftp extends AbstractFtp {
 	 */
 	public Sftp get(final String src, final OutputStream out) {
 		try {
-			channel.get(src, out);
+			getClient().get(src, out);
 		} catch (final SftpException e) {
 			throw new JschRuntimeException(e);
 		}