fix code

hutool-captcha/src/main/java/cn/hutool/captcha/generator/MathGenerator.java

@@ -1,5 +1,6 @@
 package cn.hutool.captcha.generator;
 
+import cn.hutool.core.math.Calculator;
 import cn.hutool.core.util.CharUtil;
 import cn.hutool.core.util.RandomUtil;
 import cn.hutool.core.util.StrUtil;
@@ -59,20 +60,8 @@ public class MathGenerator implements CodeGenerator {
 			return false;
 		}
 
-		final int a = Integer.parseInt(StrUtil.sub(code, 0, this.numberLength).trim());
+		final int calculateResult = (int) Calculator.conversion(code);
-		final char operator = code.charAt(this.numberLength);
+		return result == calculateResult;
-		final int b = Integer.parseInt(StrUtil.sub(code, this.numberLength + 1, this.numberLength + 1 + this.numberLength).trim());
-
-		switch (operator) {
-		case '+':
-			return (a + b) == result;
-		case '-':
-			return (a - b) == result;
-		case '*':
-			return (a * b) == result;
-		default:
-			return false;
-		}
 	}
 
 	/**

hutool-captcha/src/test/java/cn/hutool/captcha/GeneratorTest.java

@@ -0,0 +1,14 @@
+package cn.hutool.captcha;
+
+import cn.hutool.captcha.generator.MathGenerator;
+import org.junit.Test;
+
+public class GeneratorTest {
+	@Test
+	public void mathGeneratorTest(){
+		final MathGenerator mathGenerator = new MathGenerator();
+		for (int i = 0; i < 1000; i++) {
+			mathGenerator.verify(mathGenerator.generate(), "0");
+		}
+	}
+}

hutool-core/src/main/java/cn/hutool/core/math/Calculator.java

@@ -1,6 +1,7 @@
 package cn.hutool.core.math;
 
 import cn.hutool.core.util.NumberUtil;
+import cn.hutool.core.util.StrUtil;
 
 import java.math.BigDecimal;
 import java.util.Collections;
@@ -25,28 +26,21 @@ public class Calculator {
 	 * @return 计算结果
 	 */
 	public static double conversion(String expression) {
-		double result;
+		final Calculator cal = new Calculator();
-		Calculator cal = new Calculator();
+		expression = transform(expression);
-		try {
+		return cal.calculate(expression);
-			expression = transform(expression);
-			result = cal.calculate(expression);
-		} catch (Exception e) {
-			// e.printStackTrace();
-			// 运算错误返回NaN
-			return Double.NaN;
-		}
-		// return new String().valueOf(result);
-		return result;
 	}
 
 	/**
 	 * 将表达式中负数的符号更改
 	 *
 	 * @param expression 例如-2+-1*(-3E-2)-(-1) 被转为 ~2+~1*(~3E~2)-(~1)
-	 * @return 更改后的表达式
+	 * @return 转换后的字符串
 	 */
 	private static String transform(String expression) {
-		char[] arr = expression.toCharArray();
+		expression = StrUtil.cleanBlank(expression);
+		expression = StrUtil.removeSuffix(expression, "=");
+		final char[] arr = expression.toCharArray();
 		for (int i = 0; i < arr.length; i++) {
 			if (arr[i] == '-') {
 				if (i == 0) {

hutool-core/src/test/java/cn/hutool/core/math/CalculatorTest.java

@@ -10,4 +10,10 @@ public class CalculatorTest {
 		final double conversion = Calculator.conversion("(0*1--3)-5/-4-(3*(-2.13))");
 		Assert.assertEquals(10.64, conversion, 2);
 	}
+
+	@Test
+	public void conversationTest2(){
+		final double conversion = Calculator.conversion("77 * 12");
+		Assert.assertEquals(924.0, conversion, 2);
+	}
 }

hutool-http/src/main/java/cn/hutool/http/cookie/GlobalCookieManager.java

@@ -69,7 +69,7 @@ public class GlobalCookieManager {
 
 		Map<String, List<String>> cookieHeader;
 		try {
-			cookieHeader = cookieManager.get(getURI(conn), new HashMap<String, List<String>>(0));
+			cookieHeader = cookieManager.get(getURI(conn), new HashMap<>(0));
 		} catch (IOException e) {
 			throw new IORuntimeException(e);
 		}