feat:增加数字缩写转换

hutool-core/src/main/java/cn/hutool/core/convert/NumberWordFormatter.java

@@ -2,6 +2,8 @@ package cn.hutool.core.convert;
 
 import cn.hutool.core.util.StrUtil;
 
+import java.text.DecimalFormat;
+
 /**
  * 将浮点数类型的number转换成英语的表达方式 <br>
  * 参考博客：http://blog.csdn.net/eric_sunah/article/details/8713226
@@ -19,6 +21,8 @@ public class NumberWordFormatter {
             "SEVENTY", "EIGHTY", "NINETY"};
     private static final String[] NUMBER_MORE = new String[]{"", "THOUSAND", "MILLION", "BILLION"};
 
+    private static final String[] NUMBER_SUFFIX = new String[]{"k", "w", "", "m", "", "", "b", "", "", "t", "", "", "p", "", "", "e"};
+
     /**
      * 将阿拉伯数字转为英文表达式
      *
@@ -33,6 +37,42 @@ public class NumberWordFormatter {
         }
     }
 
+	/**
+	 * 将阿拉伯数字转化为简介计数单位，例如 2100 => 2.1k
+	 * 范围默认只到w
+	 * @param value
+	 * @return
+	 */
+	public static String formatValue(long value) {
+		return formatValue(value, true);
+	}
+
+	/**
+	 * 将阿拉伯数字转化为简介计数单位，例如 2100 => 2.1k
+	 * @param value 对应数字的值
+	 * @param isTwo 控制是否为k、w
+	 * @return
+	 */
+    public static String formatValue(long value, boolean isTwo) {
+    	if (value < 1000) {
+    		return String.valueOf(value);
+		}
+        int index = -1;
+        double res = value * 1.0d;
+        while (res > 10 && (!isTwo || index < 1)) {
+        	if (res > 1000) {
+				res = res / 1000;
+				index++;
+			}
+        	if (res > 10) {
+        		res = res / 10;
+        		index++;
+			}
+        }
+        DecimalFormat decimalFormat = new DecimalFormat("#.##");
+        return String.format("%s%s", decimalFormat.format(res), NUMBER_SUFFIX[index]);
+    }
+
     /**
      * 将阿拉伯数字转为英文表达式
      *

hutool-core/src/test/java/cn/hutool/core/convert/NumberWordFormatTest.java

@@ -12,5 +12,14 @@ public class NumberWordFormatTest {
 		
 		String format2 = NumberWordFormatter.format("2100.00");
 		Assert.assertEquals("TWO THOUSAND ONE HUNDRED AND CENTS  ONLY", format2);
+
+		String format3 = NumberWordFormatter.formatValue(4384324, false);
+		Assert.assertEquals("4.38m", format3);
+
+		String format4 = NumberWordFormatter.formatValue(4384324);
+		Assert.assertEquals("438.43w", format4);
+
+		String format5 = NumberWordFormatter.formatValue(438);
+		Assert.assertEquals("438", format5);
 	}
 }