计算

src/main/java/com/aps/common/util/BigDecimalUtil.java

+package com.aps.common.util;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+/**
+ * BigDecimal 运算工具类
+ */
+public class BigDecimalUtil {
+    
+    // 默认精度（小数点后4位）
+    private static final int DEFAULT_SCALE = 4;
+    // 默认舍入模式
+    private static final RoundingMode DEFAULT_ROUNDING_MODE = RoundingMode.HALF_UP;
+    
+    /**
+     * 安全加法（处理null值）
+     */
+    public static BigDecimal safeAdd(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.add(num2);
+    }
+    
+    /**
+     * 安全减法
+     */
+    public static BigDecimal safeSubtract(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.subtract(num2);
+    }
+    
+    /**
+     * 安全乘法
+     */
+    public static BigDecimal safeMultiply(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.multiply(num2);
+    }
+    
+    /**
+     * 安全乘法（带精度）
+     */
+    public static BigDecimal safeMultiply(BigDecimal num1, BigDecimal num2, int scale) {
+        BigDecimal result = safeMultiply(num1, num2);
+        return result.setScale(scale, DEFAULT_ROUNDING_MODE);
+    }
+    
+    /**
+     * 安全除法
+     */
+    public static BigDecimal safeDivide(BigDecimal numerator, BigDecimal denominator) {
+        return safeDivide(numerator, denominator, DEFAULT_SCALE);
+    }
+    
+    /**
+     * 安全除法（指定精度）
+     */
+    public static BigDecimal safeDivide(BigDecimal numerator, BigDecimal denominator, int scale) {
+        numerator = defaultIfNull(numerator);
+        denominator = defaultIfNull(denominator);
+        
+        if (denominator.compareTo(BigDecimal.ZERO) == 0) {
+            throw new ArithmeticException("除数不能为零");
+        }
+        
+        return numerator.divide(denominator, scale, DEFAULT_ROUNDING_MODE);
+    }
+    
+    /**
+     * 比较大小
+     */
+    public static boolean isGreaterThan(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.compareTo(num2) > 0;
+    }
+    
+    public static boolean isLessThan(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.compareTo(num2) < 0;
+    }
+    
+    public static boolean equals(BigDecimal num1, BigDecimal num2) {
+        num1 = defaultIfNull(num1);
+        num2 = defaultIfNull(num2);
+        return num1.compareTo(num2) == 0;
+    }
+    
+    /**
+     * 处理null值
+     */
+    private static BigDecimal defaultIfNull(BigDecimal value) {
+        return value != null ? value : BigDecimal.ZERO;
+    }
+    
+
+}
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