add Introduction

src/main/resources/java/com/wwq/calculator/CalculatorIntroduction.java

@@ -0,0 +1,17 @@
+package com.wwq.calculator;
+
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.DeclareParents;
+
+@Aspect
+public class CalculatorIntroduction {
+	@DeclareParents(
+			value = "com.wwq.calculator.ArithmeticCalculatorImpl", 
+			defaultImpl = MaxCalculatorImpl.class)
+	public MaxCalculator maxCalculator;
+
+	@DeclareParents(
+			value = "com.wwq.calculator.ArithmeticCalculatorImpl", 
+			defaultImpl = MinCalculatorImpl.class)
+	public MinCalculator minCalculator;
+}

src/main/resources/java/com/wwq/calculator/Main.java

@@ -17,9 +17,14 @@ public static void main(String[] args) {
 		ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) context
 				.getBean("arithmeticCalculator");
 	/*	arithmeticCalculator.add(1, 2);*/
-		arithmeticCalculator.sub(4, 3);
+	/*	arithmeticCalculator.sub(4, 3);*/
 	/*	arithmeticCalculator.mul(2, 3);
 		arithmeticCalculator.div(4, -1);*/
+		MaxCalculator maxCalculator = (MaxCalculator) arithmeticCalculator;
+		maxCalculator.max(1, 2);
+		MinCalculator minCalculator = (MinCalculator) arithmeticCalculator;
+		minCalculator.min(1, 2);
+
 
 	/*	UnitCalculator unitCalculator = (UnitCalculator) context
 				.getBean("unitCalculator");

src/main/resources/java/com/wwq/calculator/MaxCalculator.java

@@ -0,0 +1,5 @@
+package com.wwq.calculator;
+
+public interface MaxCalculator {
+	public double max(double a, double b);
+}

src/main/resources/java/com/wwq/calculator/MaxCalculatorImpl.java

@@ -0,0 +1,20 @@
+package com.wwq.calculator;
+
+import org.apache.log4j.Logger;
+
+public class MaxCalculatorImpl implements MaxCalculator {
+	/**
+	 * Logger for this class
+	 */
+	private static final Logger logger = Logger
+			.getLogger(MaxCalculatorImpl.class);
+
+	@Override
+	public double max(double a, double b) {
+		// TODO Auto-generated method stub
+		double result = (a >= b) ? a : b;
+		logger.info("max(" + a + ", " + b + ") = " + result);
+		return result;
+	}
+
+}

src/main/resources/java/com/wwq/calculator/MinCalculator.java

@@ -0,0 +1,5 @@
+package com.wwq.calculator;
+
+public interface MinCalculator {
+	public double min(double a, double b);
+}

src/main/resources/java/com/wwq/calculator/MinCalculatorImpl.java

@@ -0,0 +1,20 @@
+package com.wwq.calculator;
+
+import org.apache.log4j.Logger;
+
+public class MinCalculatorImpl implements MinCalculator {
+	/**
+	 * Logger for this class
+	 */
+	private static final Logger logger = Logger
+			.getLogger(MinCalculatorImpl.class);
+
+	@Override
+	public double min(double a, double b) {
+		// TODO Auto-generated method stub
+		double result = (a <= b) ? a : b;
+		logger.info("min(" + a + ", " + b + ") = " + result);
+		return result;
+	}
+
+}

src/main/webapp/WEB-INF/applicationContext.xml

@@ -14,6 +14,7 @@
 		class="com.wwq.calculator.UnitCalculatorImpl" />
 	<bean class="com.wwq.calculator.CalculatorLoggingAspect" />
 	<bean class="com.wwq.calculator.CalculatorValidationAspect"/>
+	<bean class="com.wwq.calculator.CalculatorIntroduction"/>