feature:[none]增加list分组方法

a.txt

+afafa
\ No newline at end of file

pcloud-common/src/main/java/com/pcloud/common/utils/ListUtils.java

@@ -3,6 +3,7 @@
  */
 package com.pcloud.common.utils;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -16,5 +17,55 @@ public class ListUtils {
 	public static boolean isEmpty(List<?> list) {
 		return (list == null || list.isEmpty());
 	}
-    
+
+    private static final Integer OFFSET = 500;
+
+    /**
+     * 切割list,默认500长度一个
+     * @param list
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupList(List<T> list) {
+        return groupList(list,OFFSET);
+    }
+
+    /**
+     * 切割list，自定义长度
+     * @param list
+     * @param length
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupList(List<T> list,int length) {
+        List<List<T>> listGroup = new ArrayList<>();
+        int listSize = list.size();
+        //子集合的长度
+        int toIndex = length;
+        for (int i = 0; i < list.size(); i += length) {
+            if (i + length > listSize) {
+                toIndex = listSize - i;
+            }
+            List<T> newList = list.subList(i, i + toIndex);
+            listGroup.add(newList);
+        }
+        return listGroup;
+    }
+
+    /**
+     * 切割list，自定义子集合个数
+     * @param list
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> groupListBySize(List<T> list,int size) {
+        int length = list.size()/size;
+        if(list.size()<10){
+            length = 1;
+        }
+        return groupList(list,length);
+    }
+
+
+
 }