类型转换

yzg-util-base/src/main/java/com/yanzuoguang/util/base/ObjectHelper.java

@@ -405,7 +405,14 @@ public class ObjectHelper {
      * @throws InstantiationException 异常信息
      */
     public static <T> T convert(Class<T> toCls, Object from) throws IllegalAccessException, InstantiationException {
-        T to = toCls.newInstance();
+        if (from == null) {
+            return null;
+        }
+        T to = StringHelper.to(toCls, from);
+        if (to != null) {
+            return to;
+        }
+        to = toCls.newInstance();
         writeWithToClass(to, from);
         return to;
     }

yzg-util-base/src/main/java/com/yanzuoguang/util/helper/StringHelper.java

 package com.yanzuoguang.util.helper;
 
+import com.yanzuoguang.util.base.ObjectHelper;
 import com.yanzuoguang.util.exception.CodeException;
 import com.yanzuoguang.util.exception.ExceptionHelper;
 
@@ -248,6 +249,9 @@ public class StringHelper {
      * @return 返回获取的值
      */
     public static <T> T to(Class<T> cls, Object from) {
+        if (from == null) {
+            return null;
+        }
         String vName = cls.getName();
         Object to = null;
         if (cls.isEnum()) {
@@ -272,8 +276,11 @@ public class StringHelper {
         if (to != null) {
             return (T) to;
         } else {
+            if (ObjectHelper.isSub(cls, from.getClass())) {
                 return (T) from;
             }
+            return (T) to;
+        }
     }
 
     /**