Hello World
1 JDK Proxy 案例
建立介面
package com.gientech.proxy.jdk;
public interface ICalculator {
public Integer add(Integer i,Integer j);
public Integer sub(Integer i,Integer j);
public Integer mul(Integer i,Integer j);
public Integer div(Integer i,Integer j);
}
建立實現類
package com.gientech.proxy.jdk;
public class MyCalculator implements ICalculator{
@Override
public Integer add(Integer i, Integer j) {
return i+j;
}
@Override
public Integer sub(Integer i, Integer j) {
return i-j;
}
@Override
public Integer mul(Integer i, Integer j) {
return i*j;
}
@Override
public Integer div(Integer i, Integer j) {
return i/j;
}
}
建立proxy
package com.gientech.proxy.jdk;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class CalculatorProxy {
public static ICalculator getProxy(final ICalculator calculator){
ClassLoader loader = calculator.getClass().getClassLoader();
Class<?>[] interfaces = calculator.getClass().getInterfaces();
InvocationHandler handler = new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
try {
result = method.invoke(calculator, args);
}catch (Exception e){
System.out.println(e);
}finally {
}
return result;
}
};
Object proxy = Proxy.newProxyInstance(loader, interfaces, handler);
return (ICalculator) proxy;
}
}
建立測試類
package com.gientech.proxy.jdk;
public class JDKProxyTest {
public static void main(String[] args) {
System.getProperties().put("sun.misc.", "true");
ICalculator proxy = CalculatorProxy.getProxy(new MyCalculator());
Integer result = proxy.add(1,1);
System.out.println("result ---- " + result);
System.out.println(proxy.getClass());
}
}
執行結果如下：
