動態代理jdk 和cglib

jdk方式

package com.kite.dao.jdkproxy; /** * 定義一個person類 * @author admin * */
public class Person { private Long pid; private String pname; public Long getPid() { return pid; } public void setPid(Long pid) { this.pid = pid; } public String getPname() { return pname; } public void setPname(String pname) { this.pname = pname; } }

 

 1 package com.kite.dao.jdkproxy;  2 
 3 import java.util.List;  4 /**
 5  * 定義一個接口  6  * @author admin  7  *  8  */
 9 public interface PersonDao 10 { 11     public void savePerson(); 12     public void updatePerson(); 13     public void deletePerson(); 14     public List<Person> getPerson(); 15 }

package com.kite.dao.jdkproxy; import java.util.ArrayList; import java.util.List; /** * 實現接口 * @author admin * */
public class PersonDaoImpl implements PersonDao { @Override public void savePerson() { System.out.println("save person"); } @Override public void updatePerson() { System.out.println("update person"); } @Override public void deletePerson() { System.out.println("delete person"); } @Override public List<Person> getPerson() { List<Person> list = new ArrayList<Person>(); Person p = new Person(); p.setPname("kite"); p.setPid(1L); list.add(p); for(Person person : list) { System.out.println(person.getPname()); } return null; } }

 

 1 package com.kite.dao.jdkproxy;  2 /**
 3  * 模仿事物  4  * @author admin  5  *  6  */
 7 public class Transaction  8 {  9     public void beginTransaction() 10  { 11         System.out.println("begin transaction"); 12  } 13     public void commitTransaction() 14  { 15         System.out.println("commit transaction"); 16  } 17     
18     
19 }

 

 1 package com.kite.dao.jdkproxy;  2 
 3 import java.lang.reflect.InvocationHandler;  4 import java.lang.reflect.Method;  5 
 6 /**
 7  * 代理類  8  * @author admin  9  * 10  */
11 public class PersonDaoInteceptor implements InvocationHandler 12 { 13 
14     private Transaction transaction; 15     public Object target; 16     public PersonDaoInteceptor(Object target, Transaction transaction) 17  { 18         this.transaction = transaction; 19         this.target = target; 20  } 21  @Override 22     public Object invoke(Object proxy, Method method, Object[] args) 23             throws Throwable 24  { 25  Object obj; 26         String methodName = method.getName(); 27         if("savePerson".equals(methodName) || "updatePerson".equals(methodName) || "deletePerson".equals(methodName)) 28  { 29  transaction.beginTransaction(); 30             obj = method.invoke(target, args); 31  transaction.commitTransaction(); 32         }else
33  { 34             obj = method.invoke(target, args); 35  } 36         return obj; 37  } 38 
39 }

 1 package com.kite.dao.jdkproxy;  2 
 3 import java.lang.reflect.Proxy;  4 
 5 import org.junit.Test;  6 /**
 7 *測試類  8 */
 9 public class PersonDaoTest 10 { 11  @Test 12     public void test() 13  { 14         Transaction transaction = new Transaction(); 15         PersonDao personDao = new PersonDaoImpl(); 16         //攔截器
17         PersonDaoInteceptor interceptor = new PersonDaoInteceptor(personDao, transaction); 18         //得到代理對象
19         PersonDao proxy = (PersonDao) Proxy.newProxyInstance(personDao.getClass().getClassLoader(), personDao.getClass().getInterfaces(), interceptor); 20         //調用目標方法
21  proxy.getPerson(); 22  } 23 }

 

 

cglib方式  只須要修改

 1 package com.kite.dao.jdkproxy;  2 
 3 import java.lang.reflect.InvocationHandler;  4 import java.lang.reflect.Method;  5 
 6 /**
 7  * 代理類  8  * @author admin  9  * 10  */
11 public class PersonDaoInteceptor implements InvocationHandler 12 { 13 
14     private Transaction transaction; 15     public Object target; 16     public PersonDaoInteceptor(Object target, Transaction transaction) 17  { 18         this.transaction = transaction; 19         this.target = target; 20  } 21  @Override 22     public Object invoke(Object proxy, Method method, Object[] args) 23             throws Throwable 24  { 25  Object obj; 26         String methodName = method.getName(); 27         if("savePerson".equals(methodName) || "updatePerson".equals(methodName) || "deletePerson".equals(methodName)) 28  { 29  transaction.beginTransaction(); 30             obj = method.invoke(target, args); 31  transaction.commitTransaction(); 32         }else
33  { 34             obj = method.invoke(target, args); 35  } 36         return obj; 37  } 38 
39 }

測試

 1 package com.kite.dao.cglibproxy;  2 
 3 import java.lang.reflect.Proxy;  4 
 5 import org.junit.Test;  6 
 7 public class PersonDaoTest  8 {  9  @Test 10     public void test() 11  { 12         Transaction transaction = new Transaction(); 13         PersonDao target = new PersonDaoImpl(); 14         //得到代理對象
15         PersonDaoInteceptor inteceptor = new PersonDaoInteceptor(target, transaction); 16         //調用目標方法
17         PersonDaoImpl proxy = (PersonDaoImpl) inteceptor.createProxy(); 18  proxy.getPerson(); 19  } 20 }