diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9fab546fb..c01e32018 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 
 ### 🐞Bug修复
 * 【core   】     修复UrlBuilder.addPath歧义问题（issue#1912@Github）
+* 【core   】     修复StrBuilder中总长度计算问题（issue#I4F9L7@Gitee）
 
 -------------------------------------------------------------------------------------------------------------
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/text/StrBuilder.java b/hutool-core/src/main/java/cn/hutool/core/text/StrBuilder.java
index 0de657e51..69bc75f04 100644
--- a/hutool-core/src/main/java/cn/hutool/core/text/StrBuilder.java
+++ b/hutool-core/src/main/java/cn/hutool/core/text/StrBuilder.java
@@ -579,7 +579,7 @@ public class StrBuilder implements CharSequence, Appendable, Serializable {
 	private static int totalLength(CharSequence... strs) {
 		int totalLength = 0;
 		for (CharSequence str : strs) {
-			totalLength += (null == str ? 4 : str.length());
+			totalLength += (null == str ? 0 : str.length());
 		}
 		return totalLength;
 	}
diff --git a/hutool-crypto/src/main/java/cn/hutool/crypto/digest/DigestUtil.java b/hutool-crypto/src/main/java/cn/hutool/crypto/digest/DigestUtil.java
index 775d6183c..fc6fd61ce 100644
--- a/hutool-crypto/src/main/java/cn/hutool/crypto/digest/DigestUtil.java
+++ b/hutool-crypto/src/main/java/cn/hutool/crypto/digest/DigestUtil.java
@@ -1,13 +1,12 @@
 package cn.hutool.crypto.digest;
 
+import cn.hutool.core.util.CharsetUtil;
+
+import javax.crypto.SecretKey;
 import java.io.File;
 import java.io.InputStream;
 import java.nio.charset.Charset;
 
-import javax.crypto.SecretKey;
-
-import cn.hutool.core.util.CharsetUtil;
-
 /**
  * 摘要算法工具类
  *
@@ -424,7 +423,7 @@ public class DigestUtil {
 	 * 创建HMac对象，调用digest方法可获得hmac值
 	 *
 	 * @param algorithm {@link HmacAlgorithm}
-	 * @param key       密钥，如果为<code>null</code>生成随机密钥
+	 * @param key       密钥，如果为{@code null}生成随机密钥
 	 * @return {@link HMac}
 	 * @since 3.0.3
 	 */
@@ -436,7 +435,7 @@ public class DigestUtil {
 	 * 创建HMac对象，调用digest方法可获得hmac值
 	 *
 	 * @param algorithm {@link HmacAlgorithm}
-	 * @param key       密钥{@link SecretKey}，如果为<code>null</code>生成随机密钥
+	 * @param key       密钥{@link SecretKey}，如果为{@code null}生成随机密钥
 	 * @return {@link HMac}
 	 * @since 3.0.3
 	 */
diff --git a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrCodeUtil.java b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrCodeUtil.java
index f9b800282..36e048d2b 100644
--- a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrCodeUtil.java
+++ b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrCodeUtil.java
@@ -313,9 +313,10 @@ public class QrCodeUtil {
 			// 默认配置
 			config = new QrConfig();
 		}
+
 		BitMatrix bitMatrix;
 		try {
-			bitMatrix = multiFormatWriter.encode(content, format, config.width, config.height, config.toHints());
+			bitMatrix = multiFormatWriter.encode(content, format, config.width, config.height, config.toHints(format));
 		} catch (WriterException e) {
 			throw new QrCodeException(e);
 		}
diff --git a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrConfig.java b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrConfig.java
index f9aae03e7..0c2789c87 100644
--- a/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrConfig.java
+++ b/hutool-extra/src/main/java/cn/hutool/extra/qrcode/QrConfig.java
@@ -3,6 +3,7 @@ package cn.hutool.extra.qrcode;
 import cn.hutool.core.img.ImgUtil;
 import cn.hutool.core.io.FileUtil;
 import cn.hutool.core.util.CharsetUtil;
+import com.google.zxing.BarcodeFormat;
 import com.google.zxing.EncodeHintType;
 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
@@ -331,13 +332,31 @@ public class QrConfig {
 	 * @return 配置
 	 */
 	public HashMap<EncodeHintType, Object> toHints() {
+		return toHints(BarcodeFormat.QR_CODE);
+	}
+
+	/**
+	 * 转换为Zxing的二维码配置
+	 *
+	 * @param format 格式，根据格式不同，{@link #errorCorrection}的值类型有所不同
+	 * @return 配置
+	 */
+	public HashMap<EncodeHintType, Object> toHints(BarcodeFormat format) {
 		// 配置
 		final HashMap<EncodeHintType, Object> hints = new HashMap<>();
 		if (null != this.charset) {
 			hints.put(EncodeHintType.CHARACTER_SET, charset.toString().toLowerCase());
 		}
 		if (null != this.errorCorrection) {
-			hints.put(EncodeHintType.ERROR_CORRECTION, this.errorCorrection);
+			Object value;
+			if(BarcodeFormat.AZTEC == format || BarcodeFormat.PDF_417 == format){
+				// issue#I4FE3U@Gitee
+				value = this.errorCorrection.getBits();
+			} else {
+				value = this.errorCorrection;
+			}
+
+			hints.put(EncodeHintType.ERROR_CORRECTION, value);
 		}
 		if (null != this.margin) {
 			hints.put(EncodeHintType.MARGIN, this.margin);
diff --git a/hutool-extra/src/test/java/cn/hutool/extra/qrcode/QrCodeUtilTest.java b/hutool-extra/src/test/java/cn/hutool/extra/qrcode/QrCodeUtilTest.java
index cfb5dd251..7f31d796f 100644
--- a/hutool-extra/src/test/java/cn/hutool/extra/qrcode/QrCodeUtilTest.java
+++ b/hutool-extra/src/test/java/cn/hutool/extra/qrcode/QrCodeUtilTest.java
@@ -4,6 +4,7 @@ import cn.hutool.core.codec.Base64;
 import cn.hutool.core.img.ImgUtil;
 import cn.hutool.core.io.FileUtil;
 import cn.hutool.core.lang.Console;
+import com.google.zxing.BarcodeFormat;
 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 import org.junit.Assert;
 import org.junit.Ignore;
@@ -87,4 +88,10 @@ public class QrCodeUtilTest {
 		final String decode = QrCodeUtil.decode(ImgUtil.read("d:/test/qr_a.png"), false, true);
 		Console.log(decode);
 	}
+
+	@Test
+	public void pdf417Test(){
+		final BufferedImage image = QrCodeUtil.generate("content111", BarcodeFormat.PDF_417, QrConfig.create());
+		Assert.assertNotNull(image);
+	}
 }