add IOSize.parse(String)

src/main/java/com/imyeyu/io/IOSize.java

@@ -1,5 +1,10 @@
 package com.imyeyu.io;
 
+import com.imyeyu.java.TimiJava;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 /**
  * 字节大小工具
  *
@@ -38,20 +43,13 @@ public class IOSize {
 		EB;
 
 		/**
-		 * 转换指定单位字节量
+		 * 转换字节量
 		 *
-		 * @param unit  单位
 		 * @param value 值
 		 * @return 该单位值字节量
 		 */
-		public static long value(Unit unit, double value) {
-			Unit[] values = values();
-			for (int i = 0; i < values.length; i++) {
-				if (values[i] == unit) {
-					return (long) (value * Math.pow(1024, i));
-				}
-			}
-			return (long) value;
+		public long toBytes(double value) {
+			return (long) (value * Math.pow(1024, ordinal()));
 		}
 	}
 
@@ -165,4 +163,66 @@ public class IOSize {
 		}
 		return "0";
 	}
+
+	/**
+	 * 将格式化的储存量字符串解析为字节量
+	 * <p>支持格式：10GB, 10 GB, 1TB, 1.24 KB 等（单位不区分大小写）</p>
+	 * <pre>
+	 *     // 返回 102400
+	 *     IOSize.parse("100 KB");
+	 *     // 返回 1073741824
+	 *     IOSize.parse("1GB");
+	 * </pre>
+	 *
+	 * @param sizeStr 格式化后的储存量字符串
+	 * @return 字节量
+	 * @throws IllegalArgumentException 格式无效
+	 */
+	public static long parse(String sizeStr) {
+		if (TimiJava.isEmpty(sizeStr)) {
+			throw new IllegalArgumentException("not found sizeStr");
+		}
+		// 正则匹配：可选符号 + 数字（含小数点）+ 可选空格 + 单位
+		Pattern pattern = Pattern.compile("([-+]?\\d+(?:\\.\\d+)?)\\s*([a-zA-Z]+)");
+		Matcher matcher = pattern.matcher(sizeStr.trim());
+		if (matcher.find()) {
+			double value;
+			try {
+				value = Double.parseDouble(matcher.group(1));
+			} catch (NumberFormatException e) {
+				throw new IllegalArgumentException("invalid number format: " + matcher.group(1), e);
+			}
+			if (value < 0) {
+				throw new IllegalArgumentException("size cannot be negative: " + value);
+			}
+			String unitStr = matcher.group(2).toUpperCase();
+			Unit unit;
+			try {
+				unit = Unit.valueOf(unitStr);
+			} catch (IllegalArgumentException e) {
+				// 处理单字母单位缩写（K/M/G/T/P/E）
+				unit = switch (unitStr.charAt(0)) {
+					case 'K' -> Unit.KB;
+					case 'M' -> Unit.MB;
+					case 'G' -> Unit.GB;
+					case 'T' -> Unit.TB;
+					case 'P' -> Unit.PB;
+					case 'E' -> Unit.EB;
+					case 'B' -> Unit.B;
+					default -> throw new IllegalArgumentException("Unknown unit: " + unitStr);
+				};
+			}
+			return unit.toBytes(value);
+		}
+		// 尝试解析纯数字（无单位，默认字节）
+		try {
+			long bytes = Long.parseLong(sizeStr.trim());
+			if (bytes < 0) {
+				throw new IllegalArgumentException("size cannot be negative: " + bytes);
+			}
+			return bytes;
+		} catch (NumberFormatException e) {
+			throw new IllegalArgumentException("invalid size format: " + sizeStr, e);
+		}
+	}
 }