@Service
public class BookSericeImpl implements BookSerice {
 @Override
 public void addOne(BokBean bokBean) {
  System.out.println("執(zhí)行邏輯:插入一本書");
 }
 @Override
 public void deletOne(Long bookId) {
  System.out.println("執(zhí)行邏輯:刪除一本書");
 }
}

public class BooklogServiceImpl implements BookSerice {
 private BookSerice bookSerice;
 public BooklogServiceImpl(BookSerice bookSerice) {
  this.bookSerice = bookSerice;
 }
 @Override
 public void addOne(BokBean bokBean) {

  System.out.println("準(zhǔn)備新增一本書");
  this.bookSerice.addOne(bokBean);
  System.out.println("新增一本書完成");
 }
 @Override
 public void deletOne(Long bookId) {

  System.out.println("準(zhǔn)備刪除一本書");
  this.bookSerice.deletOne(323L);
  System.out.println("刪除一本書完成");
 }
}

public void test1(){

  //Aop :面向切面編程

  //使用裝飾者模式設(shè)計(jì)對象
  BookSerice bookSerice = new BookSericeImpl();
  //把原來功能的對象通過構(gòu)造方傳給新增功能的類,并把新增功能類的對象賦給原來對象
  //這里新增功能類和原來的類都是實(shí)現(xiàn)了同一個(gè)接口.
  bookSerice = new BooklogServiceImpl(bookSerice);
  //調(diào)用新增功能類的方法,在這個(gè)方法里讓構(gòu)造方法傳過去的對象調(diào)用原來的功能
  bookSerice.addOne(new BokBean());
 }

@Service
public class BookSericeImpl implements BookSerice {
 @Override
 public void addOne(BokBean bokBean) {
  System.out.println("執(zhí)行邏輯:插入一本書");
 }
 @Override
 public void deletOne(Long bookId) {
  System.out.println("執(zhí)行邏輯:刪除一本書");
 }
}

public void test2(){

 //創(chuàng)建需要代理的對象
 BookSerice bookSerice = new BookSericeImpl();
 //根據(jù)對象的類獲取類加載器
 ClassLoader classLoader = bookSerice.getClass().getClassLoader();
 //獲取被代理對象說實(shí)現(xiàn)的所有接口
 Class<?>[] interfaces = bookSerice.getClass().getInterfaces();
 //新建代理對象,里面參數(shù)需要(類加載器,一個(gè)對象所實(shí)現(xiàn)的接口,InvocationHandler接口類的對象)
 bookSerice = (BookSerice) Proxy.newProxyInstance(classLoader, interfaces, new LogHandler(bookSerice)); 
 bookSerice.addOne(new BokBean());
 bookSerice.deletOne(232L);
}

public class LogHandler implements InvocationHandler {

 //通過構(gòu)造方法接受一個(gè)沒有被代理的原來的對象
 //通過下面的方法名的反射找到這個(gè)對象對應(yīng)方法
 private Object target;
 public LogHandler(Object target) {
  this.target = target;
 }
 //當(dāng)代理對象調(diào)用原方法的時(shí)候,就會調(diào)用這個(gè)invoke方法
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
  String classname = target.getClass().getName();
  String methodName = method.getName();
  System.out.println(classname+"."+methodName+"方法開始執(zhí)行");
  //這里實(shí)際是Method類通過方法名反射調(diào)用了原方法(addone)
  Object value = method.invoke(target, args);
  System.out.println(classname+"."+methodName+"方法執(zhí)行完畢");
  return value;

 }
}

public void test3(){

  //創(chuàng)建需要代理增強(qiáng)的對象
  BookSerice bookSerice = new BookSericeImpl();
  Enhancer enhancer = new Enhancer();
  //用增強(qiáng)器對象創(chuàng)建類增強(qiáng)器
  enhancer.setClassLoader(bookSerice.getClass().getClassLoader());

  //因?yàn)閯?chuàng)建的代理對象是目標(biāo)對象的子類,所以這里填的就是目標(biāo)對象的類
  enhancer.setSuperclass(bookSerice.getClass());

  //創(chuàng)建代理對象,這里需要的參數(shù)是Callback接口的對象,所以需要?jiǎng)?chuàng)建一個(gè)接口的實(shí)現(xiàn)類.
  enhancer.setCallback(new TimeMethodInterceptor(bookSerice));
  //把代理對象賦給原對象
  bookSerice = (BookSerice) enhancer.create();
  bookSerice.addOne(new BokBean());
  bookSerice.deletOne(1l);
  
 }

//Callback接口沒有實(shí)現(xiàn)方法,所以這里實(shí)現(xiàn)的是他的子接口
public class TimeMethodInterceptor implements MethodInterceptor {

 private Object target;

 public TimeMethodInterceptor(Object target) {
  this.target = target;
 }

 @Override
 public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
  //記錄當(dāng)前系統(tǒng)時(shí)間
  //這個(gè)時(shí)間是從1970年1月1日 0點(diǎn)0分到現(xiàn)在的毫秒數(shù)
  long start = System.currentTimeMillis();
  Object value = method.invoke(target, objects);
  long time = System.currentTimeMillis() - start;
  System.out.println("當(dāng)前時(shí)長"+time+"毫秒");
  return null;
 }
}