update README.md.

Signed-off-by: 夜雪剑辰 <1107047387@qq.com>

README.md

@@ -1,11 +1,11 @@
-yexuejc-base 基于jdk8常用工具包
+yexuejc-base 基于jdk11常用工具包
 ----------------------
 源码地址:<br>
 github:https://github.com/yexuejc/yexuejc-base
 gitee:https://gitee.com/jzsw-it/yexuejc-base
 
 ### 说明
-1. 支持环境：java8（1.5.0开始支持java11，请使用`x.x.x-jre11`版本）
+1. 支持环境：java11（1.5.0开始支持java11，请使用`1.5.x-jre11`版本）
 2. 该工具包基于springboot提取，按理说适用于所有java工程
 3. 其中依赖jjwt相关、validation-api，排除请使用
 >   ```
@@ -23,7 +23,7 @@ gitee:https://gitee.com/jzsw-it/yexuejc-base
 7. 从`1.5.0`开始，版本分为`1.5.0-jre8`和`1.5.0-jre11`，分别对于jre8和jre11使用
 
 ### 使用
->yexuejc.base.version=1.5.0-jre8
+>yexuejc.base.version=1.5.1-jre11
 
 pom.xml
 ```

src/main/java/com/yexuejc/base/util/JsonUtil.java

@@ -1,5 +1,14 @@
 package com.yexuejc.base.util;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.sql.Timestamp;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.Map;
+import java.util.TimeZone;
+import java.util.logging.Logger;
+
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.core.JsonParseException;
@@ -24,15 +33,6 @@ import com.yexuejc.base.converter.LocalDateTimeSerializer;
 import com.yexuejc.base.converter.TimestampDeserializer;
 import com.yexuejc.base.converter.TimestampSerializer;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.sql.Timestamp;
-import java.time.LocalDate;
-import java.time.LocalDateTime;
-import java.util.Map;
-import java.util.TimeZone;
-import java.util.logging.Logger;
-
 /**
  * json工具类，基于jackson
  *
@@ -42,7 +42,7 @@ import java.util.logging.Logger;
  * @date 2018/9/3 15:28
  */
 public class JsonUtil {
-    private static Logger log = Logger.getLogger(JsonUtil.class.getName());
+    private static final Logger log = Logger.getLogger(JsonUtil.class.getName());
 
     private JsonUtil() {
     }
@@ -50,10 +50,9 @@ public class JsonUtil {
     /**
      * 作为单例全局使用
      */
-    private static JsonMapper jsonMapper = new JsonMapper();
+    private static final JsonMapper jsonMapper = new JsonMapper();
 
     static {
-        JsonUtil.setJavaTimeModule(JsonUtil.jsonMapper);
         JsonUtil.initDefaultObjectMapper(JsonUtil.jsonMapper);
     }
 
@@ -94,14 +93,17 @@ public class JsonUtil {
      * </pre>
      *
      * @param jsonMapper
+     * @return
      */
-    private static void initDefaultObjectMapper(ObjectMapper jsonMapper) {
+    private static ObjectMapper initDefaultObjectMapper(ObjectMapper jsonMapper) {
+        JsonUtil.setJavaTimeModule(jsonMapper);
         //值为空时，NON_NULL：舍去字段；ALWAYS:保留字段
         jsonMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
         jsonMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
         jsonMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
         jsonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
         jsonMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
+        return jsonMapper;
     }
 
     /**
@@ -121,8 +123,7 @@ public class JsonUtil {
      *
      * @return
      */
-    public static ObjectMapper acceptEmptyStringAsNullObject() {
-        JsonMapper jsonMapper = new JsonMapper();
+    public static ObjectMapper acceptEmptyStringAsNullObject(JsonMapper jsonMapper) {
         setJavaTimeModule(jsonMapper);
         //值为空时，ALWAYS:保留字段，默认字符串值为“”，对象值为null
         jsonMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);

src/main/java/com/yexuejc/base/util/StrUtil.java

@@ -1,8 +1,7 @@
 package com.yexuejc.base.util;
 
 import java.io.UnsupportedEncodingException;
-import java.net.http.HttpClient;
-import java.net.http.HttpRequest;
+import java.lang.reflect.Array;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
@@ -11,9 +10,9 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Random;
 import java.util.UUID;
-import java.util.concurrent.ExecutionException;
 import java.util.function.Consumer;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -33,36 +32,25 @@ public final class StrUtil {
     private static char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 
     /**
-     * 判断字符串，数组，集合 是否为空
+     * 判断字符串，数组，集合 是否为空(null，""，[],{})
      *
-     * @param obj
+     * @param obj 対象
+     * @return true:空;false:非空
      * @return
      */
     public static boolean isEmpty(Object obj) {
-        if (obj instanceof String) {
-            if (obj == null || "".equals((String) obj)) {
-                return true;
-            } else {
-                return false;
-            }
-        } else if (obj instanceof Object[]) {
-            if (obj == null || ((Object[]) obj).length == 0) {
-                return true;
-            } else {
-                return false;
-            }
-        } else if (obj instanceof Collection<?>) {
-            if (obj == null || ((Collection<?>) obj).size() == 0) {
-                return true;
-            } else {
-                return false;
-            }
+        if (obj == null) {
+            return true;
+        } else if (obj instanceof Optional) {
+            return ((Optional<?>) obj).isEmpty();
+        } else if (obj instanceof CharSequence) {
+            return ((CharSequence) obj).length() == 0;
+        } else if (obj.getClass().isArray()) {
+            return Array.getLength(obj) == 0;
+        } else if (obj instanceof Collection) {
+            return ((Collection<?>) obj).isEmpty();
         } else {
-            if (obj == null) {
-                return true;
-            } else {
-                return false;
-            }
+            return obj instanceof Map && ((Map<?, ?>) obj).isEmpty();
         }
     }