接口
package com.spring.aop;
public interface ArtthemticCalculator {
int add(int i ,int j);
int sub(int i ,int j);
int mul(int i ,int j);
int div(int i ,int j);
}
實現類
package com.spring.aop;
public class ArtthemticCalculatorImpl implements ArtthemticCalculator {
@Override
public int add(int i, int j) {
// System.out.println("The method add begins with [ " + i + " , " + j + " ]");
int result = i + j;
// System.out.println("The method add ends with "+ result);
return result;
}
@Override
public int sub(int i, int j) {
// System.out.println("The method sub begins with [ " + i + " , " + j + " ]");
int result = i - j;
// System.out.println("The method sub ends with "+ result);
return result;
}
@Override
public int mul(int i, int j) {
// System.out.println("The method mul begins with [ " + i + " , " + j + " ]");
int result = i * j;
// System.out.println("The method mul ends with "+ result);
return result;
}
@Override
public int div(int i, int j) {
// System.out.println("The method div begins with [ " + i + " , " + j + " ]");
int result = i / j;
// System.out.println("The method div ends with "+ result);
return result;
}
}
動態代理
package com.spring.aop;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
public class ArtthemticCalculatorLoggingProxy {
// 要代理的對象
private ArtthemticCalculator target;
public ArtthemticCalculatorLoggingProxy(ArtthemticCalculator target) {
this.target = target;
}
public ArtthemticCalculator getLoggingProxy(){
ArtthemticCalculator proxy = null;
// 代理對象由哪一個加載器負責加載
ClassLoader loader = target.getClass().getClassLoader();
// 代理對象的類型，即其中有哪些方法
Class[] interfaces = new Class[]{ArtthemticCalculator.class};
// 當調用代理對象方法時候，該執行的方法
InvocationHandler h = new InvocationHandler(){
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
// 開始日誌
System.out.println("The method " + method.getName() + " begins with " + Arrays.asList(args));
// 執行方法
Object result = method.invoke(target, args);
// 結束日誌
System.out.println("The method div ends with "+ result);
return result;
}
};
proxy = (ArtthemticCalculator) Proxy.newProxyInstance(loader, interfaces, h);
return proxy;
}
}
測試類
package com.spring.aop;
public class Mainaop2 {
public static void main(String[] args) {
// ArtthemticCalculator a = new ArtthemticCalculatorImpl();
ArtthemticCalculator target = new ArtthemticCalculatorImpl();
ArtthemticCalculator proxy = new ArtthemticCalculatorLoggingProxy(target).getLoggingProxy();
// int result = a.add(3, 8);
int result = proxy.add(3, 8);
System.out.println(result);
// result = a.sub(16, 8);
result = proxy.sub(16, 8);
System.out.println(result);
// result = a.mul(16, 8);
result = proxy.mul(16, 8);
System.out.println(result);
// result = a.div(72, 8);
result = proxy.div(72, 8);
System.out.println(result);
}
}
