动态代理

来源：互联网发布：淘宝酷动城怎么加入编辑：程序博客网时间：2024/05/21 08:01

public class Person {
   private String name;
   private Integer id;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public Integer getId() {
       return id;
   }
   public void setId(Integer id) {
       this.id = id;
   }

   public Person(Integer id, String name) {
       super();
       this.id = id;
       this.name = name;
   }
   public Person() {

   }

   @Override
   public String toString() {
       return "Person [name=" + name + ", id=" + id + "]";
   }

}

//抽象接口

public interface Service {

   void add(Person person);
   void delete(Integer id);
   void update(Person person);

}

//服务类

public class ServiceI implements Service {

   private static Map<Integer,Person> persons
       =new HashMap<Integer, Person>();
   public static Map<Integer, Person> getpersons() {
       return persons;
   }
   public ServiceI() {
       persons.put(1, new Person(1001, "aaa"));
       persons.put(2, new Person(1002, "bbb"));
   }
   @Override
   public void add(Person person) {
       persons.put(person.getId(), person);

   }

   @Override
   public void delete(Integer id) {
       if (id==1) {
           throw new RuntimeException("1不能被成删除");
       }
       persons.remove(id);

   }

   @Override
   public void update(Person person) {
       persons.put(person.getId(), person);

   }

}

//代理类

public class PersonServiceProxy {
   private Service target=null;
   public PersonServiceProxy (Service target) {
       this.target=target;
   }
   public Service getPersonServiceProxy() {
       Service proxy=(Service) Proxy.newProxyInstance(target.getClass().getClassLoader(),
               target.getClass().getInterfaces(),
               new InvocationHandler() {

                   @Override
                   public Object invoke(Object proxy, Method method, Object[] args)
                           throws Throwable {
                       System.out.println("开启事物");
                       try {
                           Object result=method.invoke(target, args);
                       System.out.println("提交事务");
                       return result;
                       } catch (Exception e) {
                           e.printStackTrace();
                           System.out.println("事物回滚");
                       }
                       return null;
                   }
               });
       return proxy;
   }

}

测试类

public class TestProxyTest {

   @Test
   public void testPersonService() {
       Service target=new ServiceI();
       Service proxy=new PersonServiceProxy(target).getPersonServiceProxy();
       System.out.println(ServiceI.getpersons());
       proxy.add(new Person(1005, "ccc"));
       System.out.println(ServiceI.getpersons());

       proxy.delete(1);
       System.out.println(ServiceI.getpersons());
   }

}

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