diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1130c6b6e..df45b8fe4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,14 @@
 
 -------------------------------------------------------------------------------------------------------------
 
+## 5.1.1
+
+### 新特性
+* 【core 】     ClassUtil.isSimpleValueType增加TemporalAccessor支持(issue#I170HK@Gitee)
+### Bug修复
+
+-------------------------------------------------------------------------------------------------------------
+
 ## 5.1.0
 
 ### 新特性
diff --git a/README.md b/README.md
index 890f81032..d910ec4cc 100644
--- a/README.md
+++ b/README.md
@@ -116,21 +116,21 @@ Hutool的存在就是为了减少代码搜索成本,避免网络上参差不
 <dependency>
     <groupId>cn.hutool</groupId>
     <artifactId>hutool-all</artifactId>
-    <version>5.1.0</version>
+    <version>5.1.1</version>
 </dependency>
 ```
 
 ### Gradle
 ```
-compile 'cn.hutool:hutool-all:5.1.0'
+compile 'cn.hutool:hutool-all:5.1.1'
 ```
 
 ### 非Maven项目
 
 点击以下任一链接,下载`hutool-all-X.X.X.jar`即可:
 
-- [Maven中央库1](https://repo1.maven.org/maven2/cn/hutool/hutool-all/5.1.0/)
-- [Maven中央库2](http://repo2.maven.org/maven2/cn/hutool/hutool-all/5.1.0/)
+- [Maven中央库1](https://repo1.maven.org/maven2/cn/hutool/hutool-all/5.1.1/)
+- [Maven中央库2](http://repo2.maven.org/maven2/cn/hutool/hutool-all/5.1.1/)
 
 > 注意
 > Hutool 5.x支持JDK8+,对Android平台没有测试,不能保证所有工具类获工具方法可用。
diff --git a/bin/version.txt b/bin/version.txt
index 831446cbd..ac14c3dfa 100755
--- a/bin/version.txt
+++ b/bin/version.txt
@@ -1 +1 @@
-5.1.0
+5.1.1
diff --git a/docs/js/version.js b/docs/js/version.js
index f2bed6ac7..4642eda4a 100644
--- a/docs/js/version.js
+++ b/docs/js/version.js
@@ -1 +1 @@
-var version = '5.1.0'
\ No newline at end of file
+var version = '5.1.1'
\ No newline at end of file
diff --git a/hutool-all/pom.xml b/hutool-all/pom.xml
index f508c9951..4a3ea6b30 100644
--- a/hutool-all/pom.xml
+++ b/hutool-all/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-all</artifactId>
diff --git a/hutool-aop/pom.xml b/hutool-aop/pom.xml
index 591c997ba..99f5999aa 100644
--- a/hutool-aop/pom.xml
+++ b/hutool-aop/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-aop</artifactId>
diff --git a/hutool-bloomFilter/pom.xml b/hutool-bloomFilter/pom.xml
index 5456e63f6..d9cbd5a30 100644
--- a/hutool-bloomFilter/pom.xml
+++ b/hutool-bloomFilter/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-bloomFilter</artifactId>
diff --git a/hutool-bom/pom.xml b/hutool-bom/pom.xml
index 6143bad27..8cdee01cf 100644
--- a/hutool-bom/pom.xml
+++ b/hutool-bom/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-bom</artifactId>
diff --git a/hutool-cache/pom.xml b/hutool-cache/pom.xml
index 209e4f901..a4035f288 100644
--- a/hutool-cache/pom.xml
+++ b/hutool-cache/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-cache</artifactId>
diff --git a/hutool-captcha/pom.xml b/hutool-captcha/pom.xml
index d265a607b..b9a64b38c 100644
--- a/hutool-captcha/pom.xml
+++ b/hutool-captcha/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-captcha</artifactId>
diff --git a/hutool-core/pom.xml b/hutool-core/pom.xml
index 69f1b5d7c..970a7c959 100644
--- a/hutool-core/pom.xml
+++ b/hutool-core/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-core</artifactId>
diff --git a/hutool-core/src/main/java/cn/hutool/core/util/ClassUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/ClassUtil.java
index 44c586614..24b9ed729 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/ClassUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/ClassUtil.java
@@ -8,6 +8,8 @@ import java.lang.reflect.Modifier;
 import java.lang.reflect.Type;
 import java.net.URI;
 import java.net.URL;
+import java.time.LocalDateTime;
+import java.time.temporal.TemporalAccessor;
 import java.util.Date;
 import java.util.Enumeration;
 import java.util.HashSet;
@@ -744,7 +746,17 @@ public class ClassUtil {
 
 	/**
 	 * 是否为简单值类型<br>
-	 * 包括:原始类型,、String、other CharSequence, a Number, a Date, a URI, a URL, a Locale or a Class.
+	 * 包括:
+	 * <pre>
+	 *     原始类型
+	 *     String、other CharSequence
+	 *     Number
+	 *     Date
+	 *     URI
+	 *     URL
+	 *     Locale
+	 *     Class
+	 * </pre>
 	 *
 	 * @param clazz 类
 	 * @return 是否为简单值类型
@@ -758,7 +770,9 @@ public class ClassUtil {
 				|| clazz.equals(URI.class) //
 				|| clazz.equals(URL.class) //
 				|| clazz.equals(Locale.class) //
-				|| clazz.equals(Class.class);//
+				|| clazz.equals(Class.class)//
+				// jdk8 date object
+				|| TemporalAccessor.class.isAssignableFrom(clazz); //
 	}
 
 	/**
diff --git a/hutool-cron/pom.xml b/hutool-cron/pom.xml
index 7c59621ba..8584bd708 100644
--- a/hutool-cron/pom.xml
+++ b/hutool-cron/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-cron</artifactId>
diff --git a/hutool-crypto/pom.xml b/hutool-crypto/pom.xml
index ddfa8ed48..2fe5aef5d 100644
--- a/hutool-crypto/pom.xml
+++ b/hutool-crypto/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-crypto</artifactId>
diff --git a/hutool-db/pom.xml b/hutool-db/pom.xml
index de2f39ad9..11dbb57db 100644
--- a/hutool-db/pom.xml
+++ b/hutool-db/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-db</artifactId>
diff --git a/hutool-dfa/pom.xml b/hutool-dfa/pom.xml
index e7e03fc25..7629a4279 100644
--- a/hutool-dfa/pom.xml
+++ b/hutool-dfa/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-dfa</artifactId>
diff --git a/hutool-extra/pom.xml b/hutool-extra/pom.xml
index 4db3d90e4..d7772a286 100644
--- a/hutool-extra/pom.xml
+++ b/hutool-extra/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-extra</artifactId>
diff --git a/hutool-http/pom.xml b/hutool-http/pom.xml
index 55c8146e4..f5ac2debc 100644
--- a/hutool-http/pom.xml
+++ b/hutool-http/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-http</artifactId>
diff --git a/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java b/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
index 69086a467..61730c507 100644
--- a/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
+++ b/hutool-http/src/main/java/cn/hutool/http/HttpUtil.java
@@ -549,10 +549,13 @@ public class HttpUtil {
 		int pathEndPos = paramsStr.indexOf('?');
 		if (pathEndPos > -1) {
 			paramsStr = StrUtil.subSuf(paramsStr, pathEndPos + 1);
+			if (StrUtil.isBlank(paramsStr)) {
+				return Collections.emptyMap();
+			}
 		}
 
-		final Map<String, List<String>> params = new LinkedHashMap<>();
 		final int len = paramsStr.length();
+		final Map<String, List<String>> params = new LinkedHashMap<>();
 		String name = null;
 		int pos = 0; // 未处理字符开始位置
 		int i; // 未处理字符结束位置
diff --git a/hutool-json/pom.xml b/hutool-json/pom.xml
index dc7a793f4..aa9357175 100644
--- a/hutool-json/pom.xml
+++ b/hutool-json/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-json</artifactId>
diff --git a/hutool-log/pom.xml b/hutool-log/pom.xml
index 19096e48f..718df7b6c 100644
--- a/hutool-log/pom.xml
+++ b/hutool-log/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-log</artifactId>
diff --git a/hutool-poi/pom.xml b/hutool-poi/pom.xml
index 34503c4a1..c9843a88f 100644
--- a/hutool-poi/pom.xml
+++ b/hutool-poi/pom.xml
@@ -8,7 +8,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-poi</artifactId>
diff --git a/hutool-script/pom.xml b/hutool-script/pom.xml
index 8136f34b1..366202cc0 100644
--- a/hutool-script/pom.xml
+++ b/hutool-script/pom.xml
@@ -7,7 +7,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-script</artifactId>
diff --git a/hutool-setting/pom.xml b/hutool-setting/pom.xml
index 9e7415828..9d68166a5 100644
--- a/hutool-setting/pom.xml
+++ b/hutool-setting/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-setting</artifactId>
diff --git a/hutool-socket/pom.xml b/hutool-socket/pom.xml
index 4a272ea09..3ff238071 100644
--- a/hutool-socket/pom.xml
+++ b/hutool-socket/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-socket</artifactId>
diff --git a/hutool-system/pom.xml b/hutool-system/pom.xml
index 92f0d76b9..55ae8f852 100644
--- a/hutool-system/pom.xml
+++ b/hutool-system/pom.xml
@@ -9,7 +9,7 @@
 	<parent>
 		<groupId>cn.hutool</groupId>
 		<artifactId>hutool-parent</artifactId>
-		<version>5.1.0</version>
+		<version>5.1.1-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>hutool-system</artifactId>
diff --git a/pom.xml b/pom.xml
index ba375caad..1228b4f11 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
 
 	<groupId>cn.hutool</groupId>
 	<artifactId>hutool-parent</artifactId>
-	<version>5.1.0</version>
+	<version>5.1.1-SNAPSHOT</version>
 	<name>hutool</name>
 	<description>提供丰富的Java工具方法</description>
 	<url>https://github.com/looly/hutool</url>