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标题: java学习之spirng的aop [打印本页]

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作者: 大号在练葵花宝典    时间: 2022-8-20 20:39
标题: java学习之spirng的aop
AOP技术

0x00前言

什么是AOP技术：在软件业，AOP为Aspect Oriented Programming的缩写，意为：面向切面编程，通过预编译方式和运行期间动态代理实现程序功能的统一维护的一种技术。AOP是OOP的延续，是软件开发中的一个热点，也是Spring框架中的一个重要内容，是函数式编程的一种衍生范型。利用AOP可以对业务逻辑的各个部分进行隔离，从而使得业务逻辑各部分之间的耦合度降低，提高程序的可重用性，同时提高了开发的效率。
它的实际技术就是动态代理技术
0x01动态代理技术



相当于复习一下动态代理技术

1. package auto_proxy;
3. public interface tagerinterface {
4.     public void save();
5. }
6. //写一个接口及代理对象

复制代码

1. package auto_proxy;
3. public class tager implements tagerinterface{
6.     @Override
7.     public void save() {
8. <?xml version="1.0" encoding="UTF-8"?>
9. <beans xmlns="http://www.springframework.org/schema/beans"
10.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
11.        xmlns:aop="http://www.springframework.org/schema/aop"
12.        xmlns:context="http://www.springframework.org/schema/context"
13.        xsi:schemaLocation="http://www.springframework.org/schema/beans
14.        http://www.springframework.org/schema/beans/spring-beans.xsd
15.        http://www.springframework.org/schema/aop
16.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
17. >
18.     <context:component-scan base-package="AOP_auto"/>
19.     <aop:aspectj-autoproxy/>
20. </beans>System.out.println("save running");
21.     }
22. }
23. //写一个代理对象

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1. package auto_proxy;
3. public class Advice {
4.     public void befor(){
5. <?xml version="1.0" encoding="UTF-8"?>
6. <beans xmlns="http://www.springframework.org/schema/beans"
7.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
8.        xmlns:aop="http://www.springframework.org/schema/aop"
9.        xmlns:context="http://www.springframework.org/schema/context"
10.        xsi:schemaLocation="http://www.springframework.org/schema/beans
11.        http://www.springframework.org/schema/beans/spring-beans.xsd
12.        http://www.springframework.org/schema/aop
13.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
14. >
15.     <context:component-scan base-package="AOP_auto"/>
16.     <aop:aspectj-autoproxy/>
17. </beans>System.out.println("前置增强");
18.     }
19.     public void after(){
20. <?xml version="1.0" encoding="UTF-8"?>
21. <beans xmlns="http://www.springframework.org/schema/beans"
22.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
23.        xmlns:aop="http://www.springframework.org/schema/aop"
24.        xmlns:context="http://www.springframework.org/schema/context"
25.        xsi:schemaLocation="http://www.springframework.org/schema/beans
26.        http://www.springframework.org/schema/beans/spring-beans.xsd
27.        http://www.springframework.org/schema/aop
28.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
29. >
30.     <context:component-scan base-package="AOP_auto"/>
31.     <aop:aspectj-autoproxy/>
32. </beans>System.out.println("后置增强");
33.     }
34. <?xml version="1.0" encoding="UTF-8"?>
35. <beans xmlns="http://www.springframework.org/schema/beans"
36.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
37.        xmlns:aop="http://www.springframework.org/schema/aop"
38.        xmlns:context="http://www.springframework.org/schema/context"
39.        xsi:schemaLocation="http://www.springframework.org/schema/beans
40.        http://www.springframework.org/schema/beans/spring-beans.xsd
41.        http://www.springframework.org/schema/aop
42.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
43. >
44.     <context:component-scan base-package="AOP_auto"/>
45.     <aop:aspectj-autoproxy/>
46. </beans>}
47. //这是增强方法

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1. package auto_proxy;
3. import java.lang.reflect.InvocationHandler;
4. import java.lang.reflect.Method;
5. import java.lang.reflect.Proxy;
7. public class Proxytest {
8.     public static void main(String[] args) {
9. <?xml version="1.0" encoding="UTF-8"?>
10. <beans xmlns="http://www.springframework.org/schema/beans"
11.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
12.        xmlns:aop="http://www.springframework.org/schema/aop"
13.        xmlns:context="http://www.springframework.org/schema/context"
14.        xsi:schemaLocation="http://www.springframework.org/schema/beans
15.        http://www.springframework.org/schema/beans/spring-beans.xsd
16.        http://www.springframework.org/schema/aop
17.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
18. >
19.     <context:component-scan base-package="AOP_auto"/>
20.     <aop:aspectj-autoproxy/>
21. </beans>tager tager = new tager();
22. <?xml version="1.0" encoding="UTF-8"?>
23. <beans xmlns="http://www.springframework.org/schema/beans"
24.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
25.        xmlns:aop="http://www.springframework.org/schema/aop"
26.        xmlns:context="http://www.springframework.org/schema/context"
27.        xsi:schemaLocation="http://www.springframework.org/schema/beans
28.        http://www.springframework.org/schema/beans/spring-beans.xsd
29.        http://www.springframework.org/schema/aop
30.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
31. >
32.     <context:component-scan base-package="AOP_auto"/>
33.     <aop:aspectj-autoproxy/>
34. </beans>Advice advice = new Advice();
35. <?xml version="1.0" encoding="UTF-8"?>
36. <beans xmlns="http://www.springframework.org/schema/beans"
37.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
38.        xmlns:aop="http://www.springframework.org/schema/aop"
39.        xmlns:context="http://www.springframework.org/schema/context"
40.        xsi:schemaLocation="http://www.springframework.org/schema/beans
41.        http://www.springframework.org/schema/beans/spring-beans.xsd
42.        http://www.springframework.org/schema/aop
43.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
44. >
45.     <context:component-scan base-package="AOP_auto"/>
46.     <aop:aspectj-autoproxy/>
47. </beans>tagerinterface tagerinterface =(tagerinterface) Proxy.newProxyInstance(tager.getClass().getClassLoader(), tager.getClass().getInterfaces(), new InvocationHandler() {
48. <?xml version="1.0" encoding="UTF-8"?>
49. <beans xmlns="http://www.springframework.org/schema/beans"
50.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
51.        xmlns:aop="http://www.springframework.org/schema/aop"
52.        xmlns:context="http://www.springframework.org/schema/context"
53.        xsi:schemaLocation="http://www.springframework.org/schema/beans
54.        http://www.springframework.org/schema/beans/spring-beans.xsd
55.        http://www.springframework.org/schema/aop
56.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
57. >
58.     <context:component-scan base-package="AOP_auto"/>
59.     <aop:aspectj-autoproxy/>
60. </beans>    @Override
61. <?xml version="1.0" encoding="UTF-8"?>
62. <beans xmlns="http://www.springframework.org/schema/beans"
63.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
64.        xmlns:aop="http://www.springframework.org/schema/aop"
65.        xmlns:context="http://www.springframework.org/schema/context"
66.        xsi:schemaLocation="http://www.springframework.org/schema/beans
67.        http://www.springframework.org/schema/beans/spring-beans.xsd
68.        http://www.springframework.org/schema/aop
69.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
70. >
71.     <context:component-scan base-package="AOP_auto"/>
72.     <aop:aspectj-autoproxy/>
73. </beans>    //调用代理对象的任何方法的时候都会执行invoke方法
74. <?xml version="1.0" encoding="UTF-8"?>
75. <beans xmlns="http://www.springframework.org/schema/beans"
76.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
77.        xmlns:aop="http://www.springframework.org/schema/aop"
78.        xmlns:context="http://www.springframework.org/schema/context"
79.        xsi:schemaLocation="http://www.springframework.org/schema/beans
80.        http://www.springframework.org/schema/beans/spring-beans.xsd
81.        http://www.springframework.org/schema/aop
82.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
83. >
84.     <context:component-scan base-package="AOP_auto"/>
85.     <aop:aspectj-autoproxy/>
86. </beans>    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
87. <?xml version="1.0" encoding="UTF-8"?>
88. <beans xmlns="http://www.springframework.org/schema/beans"
89.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
90.        xmlns:aop="http://www.springframework.org/schema/aop"
91.        xmlns:context="http://www.springframework.org/schema/context"
92.        xsi:schemaLocation="http://www.springframework.org/schema/beans
93.        http://www.springframework.org/schema/beans/spring-beans.xsd
94.        http://www.springframework.org/schema/aop
95.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
96. >
97.     <context:component-scan base-package="AOP_auto"/>
98.     <aop:aspectj-autoproxy/>
99. </beans>       advice.befor();
100. <?xml version="1.0" encoding="UTF-8"?>
101. <beans xmlns="http://www.springframework.org/schema/beans"
102.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
103.        xmlns:aop="http://www.springframework.org/schema/aop"
104.        xmlns:context="http://www.springframework.org/schema/context"
105.        xsi:schemaLocation="http://www.springframework.org/schema/beans
106.        http://www.springframework.org/schema/beans/spring-beans.xsd
107.        http://www.springframework.org/schema/aop
108.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
109. >
110.     <context:component-scan base-package="AOP_auto"/>
111.     <aop:aspectj-autoproxy/>
112. </beans><?xml version="1.0" encoding="UTF-8"?>
113. <beans xmlns="http://www.springframework.org/schema/beans"
114.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
115.        xmlns:aop="http://www.springframework.org/schema/aop"
116.        xmlns:context="http://www.springframework.org/schema/context"
117.        xsi:schemaLocation="http://www.springframework.org/schema/beans
118.        http://www.springframework.org/schema/beans/spring-beans.xsd
119.        http://www.springframework.org/schema/aop
120.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
121. >
122.     <context:component-scan base-package="AOP_auto"/>
123.     <aop:aspectj-autoproxy/>
124. </beans>method.invoke(tager, args);
125. <?xml version="1.0" encoding="UTF-8"?>
126. <beans xmlns="http://www.springframework.org/schema/beans"
127.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
128.        xmlns:aop="http://www.springframework.org/schema/aop"
129.        xmlns:context="http://www.springframework.org/schema/context"
130.        xsi:schemaLocation="http://www.springframework.org/schema/beans
131.        http://www.springframework.org/schema/beans/spring-beans.xsd
132.        http://www.springframework.org/schema/aop
133.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
134. >
135.     <context:component-scan base-package="AOP_auto"/>
136.     <aop:aspectj-autoproxy/>
137. </beans><?xml version="1.0" encoding="UTF-8"?>
138. <beans xmlns="http://www.springframework.org/schema/beans"
139.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
140.        xmlns:aop="http://www.springframework.org/schema/aop"
141.        xmlns:context="http://www.springframework.org/schema/context"
142.        xsi:schemaLocation="http://www.springframework.org/schema/beans
143.        http://www.springframework.org/schema/beans/spring-beans.xsd
144.        http://www.springframework.org/schema/aop
145.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
146. >
147.     <context:component-scan base-package="AOP_auto"/>
148.     <aop:aspectj-autoproxy/>
149. </beans>advice.after();
150. <?xml version="1.0" encoding="UTF-8"?>
151. <beans xmlns="http://www.springframework.org/schema/beans"
152.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
153.        xmlns:aop="http://www.springframework.org/schema/aop"
154.        xmlns:context="http://www.springframework.org/schema/context"
155.        xsi:schemaLocation="http://www.springframework.org/schema/beans
156.        http://www.springframework.org/schema/beans/spring-beans.xsd
157.        http://www.springframework.org/schema/aop
158.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
159. >
160.     <context:component-scan base-package="AOP_auto"/>
161.     <aop:aspectj-autoproxy/>
162. </beans><?xml version="1.0" encoding="UTF-8"?>
163. <beans xmlns="http://www.springframework.org/schema/beans"
164.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
165.        xmlns:aop="http://www.springframework.org/schema/aop"
166.        xmlns:context="http://www.springframework.org/schema/context"
167.        xsi:schemaLocation="http://www.springframework.org/schema/beans
168.        http://www.springframework.org/schema/beans/spring-beans.xsd
169.        http://www.springframework.org/schema/aop
170.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
171. >
172.     <context:component-scan base-package="AOP_auto"/>
173.     <aop:aspectj-autoproxy/>
174. </beans>return null;
175. <?xml version="1.0" encoding="UTF-8"?>
176. <beans xmlns="http://www.springframework.org/schema/beans"
177.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
178.        xmlns:aop="http://www.springframework.org/schema/aop"
179.        xmlns:context="http://www.springframework.org/schema/context"
180.        xsi:schemaLocation="http://www.springframework.org/schema/beans
181.        http://www.springframework.org/schema/beans/spring-beans.xsd
182.        http://www.springframework.org/schema/aop
183.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
184. >
185.     <context:component-scan base-package="AOP_auto"/>
186.     <aop:aspectj-autoproxy/>
187. </beans>    }
188. <?xml version="1.0" encoding="UTF-8"?>
189. <beans xmlns="http://www.springframework.org/schema/beans"
190.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
191.        xmlns:aop="http://www.springframework.org/schema/aop"
192.        xmlns:context="http://www.springframework.org/schema/context"
193.        xsi:schemaLocation="http://www.springframework.org/schema/beans
194.        http://www.springframework.org/schema/beans/spring-beans.xsd
195.        http://www.springframework.org/schema/aop
196.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
197. >
198.     <context:component-scan base-package="AOP_auto"/>
199.     <aop:aspectj-autoproxy/>
200. </beans>});
201. <?xml version="1.0" encoding="UTF-8"?>
202. <beans xmlns="http://www.springframework.org/schema/beans"
203.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
204.        xmlns:aop="http://www.springframework.org/schema/aop"
205.        xmlns:context="http://www.springframework.org/schema/context"
206.        xsi:schemaLocation="http://www.springframework.org/schema/beans
207.        http://www.springframework.org/schema/beans/spring-beans.xsd
208.        http://www.springframework.org/schema/aop
209.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
210. >
211.     <context:component-scan base-package="AOP_auto"/>
212.     <aop:aspectj-autoproxy/>
213. </beans>//调用代理对象方法
214. <?xml version="1.0" encoding="UTF-8"?>
215. <beans xmlns="http://www.springframework.org/schema/beans"
216.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
217.        xmlns:aop="http://www.springframework.org/schema/aop"
218.        xmlns:context="http://www.springframework.org/schema/context"
219.        xsi:schemaLocation="http://www.springframework.org/schema/beans
220.        http://www.springframework.org/schema/beans/spring-beans.xsd
221.        http://www.springframework.org/schema/aop
222.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
223. >
224.     <context:component-scan base-package="AOP_auto"/>
225.     <aop:aspectj-autoproxy/>
226. </beans>tagerinterface.save();
227.     }
228. }

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0x02AOP

0x1AOP相关概念

• Target(目标对象)：代理对象的吧目标
  
• Proxy(代理)：一个类被AOP织 入增强以后，产生了一个结果代理类
  
• Joinpoint（连接点）：所谓连接点，指那些被拦截到的点（方法），可以被增强的方法
  
• Pointcyt(切入点)：所谓切入点我们要对那些地方进行拦截。（连接点是指可以加强的方法，切入点说的是真正被增强的）
  

0x2AOP入门案例

开发模式：xml和注解开发
思路：

• 导入坐标
  
• 制作连接点（原始操作，Dao接口，实现类）
  
• 制作共性功能
  
• 定义切入点
  
• 绑定切入点与通知关系
  

还是用动态代理的方式
先写一个接口

1. public interface tagerinterface {
2.     void add();
4.     void delete();
6.     void update();
8.     void qurey();
10. }

复制代码

写一个实体函数去去继承接口
public class tager implements tagerinterface {

1. @Override
2. public void add() {
3.     System.out.println("执行增加");
4. }
6. @Override
7. public void delete() {
8.     System.out.println("执行删除");
10. }
12. @Override
13. public void update() {
14.     System.out.println("执行更新");
16. }
18. @Override
19. public void qurey() {
20.     System.out.println("执行整理");
22. }
23. }

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写一个增强类去达到不改变原类去达到增强的效果

1. public class MyAspect {
3. <?xml version="1.0" encoding="UTF-8"?>
4. <beans xmlns="http://www.springframework.org/schema/beans"
5.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
6.        xmlns:aop="http://www.springframework.org/schema/aop"
7.        xmlns:context="http://www.springframework.org/schema/context"
8.        xsi:schemaLocation="http://www.springframework.org/schema/beans
9.        http://www.springframework.org/schema/beans/spring-beans.xsd
10.        http://www.springframework.org/schema/aop
11.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
12. >
13.     <context:component-scan base-package="AOP_auto"/>
14.     <aop:aspectj-autoproxy/>
15. </beans>public void before(){
16. <?xml version="1.0" encoding="UTF-8"?>
17. <beans xmlns="http://www.springframework.org/schema/beans"
18.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
19.        xmlns:aop="http://www.springframework.org/schema/aop"
20.        xmlns:context="http://www.springframework.org/schema/context"
21.        xsi:schemaLocation="http://www.springframework.org/schema/beans
22.        http://www.springframework.org/schema/beans/spring-beans.xsd
23.        http://www.springframework.org/schema/aop
24.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
25. >
26.     <context:component-scan base-package="AOP_auto"/>
27.     <aop:aspectj-autoproxy/>
28. </beans>    System.out.println("方法执行前执行");
29. <?xml version="1.0" encoding="UTF-8"?>
30. <beans xmlns="http://www.springframework.org/schema/beans"
31.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
32.        xmlns:aop="http://www.springframework.org/schema/aop"
33.        xmlns:context="http://www.springframework.org/schema/context"
34.        xsi:schemaLocation="http://www.springframework.org/schema/beans
35.        http://www.springframework.org/schema/beans/spring-beans.xsd
36.        http://www.springframework.org/schema/aop
37.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
38. >
39.     <context:component-scan base-package="AOP_auto"/>
40.     <aop:aspectj-autoproxy/>
41. </beans>}
42. <?xml version="1.0" encoding="UTF-8"?>
43. <beans xmlns="http://www.springframework.org/schema/beans"
44.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
45.        xmlns:aop="http://www.springframework.org/schema/aop"
46.        xmlns:context="http://www.springframework.org/schema/context"
47.        xsi:schemaLocation="http://www.springframework.org/schema/beans
48.        http://www.springframework.org/schema/beans/spring-beans.xsd
49.        http://www.springframework.org/schema/aop
50.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
51. >
52.     <context:component-scan base-package="AOP_auto"/>
53.     <aop:aspectj-autoproxy/>
54. </beans>public void after(){
55. <?xml version="1.0" encoding="UTF-8"?>
56. <beans xmlns="http://www.springframework.org/schema/beans"
57.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
58.        xmlns:aop="http://www.springframework.org/schema/aop"
59.        xmlns:context="http://www.springframework.org/schema/context"
60.        xsi:schemaLocation="http://www.springframework.org/schema/beans
61.        http://www.springframework.org/schema/beans/spring-beans.xsd
62.        http://www.springframework.org/schema/aop
63.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
64. >
65.     <context:component-scan base-package="AOP_auto"/>
66.     <aop:aspectj-autoproxy/>
67. </beans>    System.out.println("方法执行后执行");
68. <?xml version="1.0" encoding="UTF-8"?>
69. <beans xmlns="http://www.springframework.org/schema/beans"
70.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
71.        xmlns:aop="http://www.springframework.org/schema/aop"
72.        xmlns:context="http://www.springframework.org/schema/context"
73.        xsi:schemaLocation="http://www.springframework.org/schema/beans
74.        http://www.springframework.org/schema/beans/spring-beans.xsd
75.        http://www.springframework.org/schema/aop
76.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
77. >
78.     <context:component-scan base-package="AOP_auto"/>
79.     <aop:aspectj-autoproxy/>
80. </beans>}
82. }

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写xml配置文件

1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4.        xmlns:aop="http://www.springframework.org/schema/aop"
5.        xsi:schemaLocation="http://www.springframework.org/schema/beans
6.        http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/aop
8.        https://www.springframework.org/schema/aop/spring-aop.xsd">
9.     <bean id="targer" />
10.     <bean id="MyAspect" />
13.    
14.     <aop:config>
15. <?xml version="1.0" encoding="UTF-8"?>
16. <beans xmlns="http://www.springframework.org/schema/beans"
17.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
18.        xmlns:aop="http://www.springframework.org/schema/aop"
19.        xmlns:context="http://www.springframework.org/schema/context"
20.        xsi:schemaLocation="http://www.springframework.org/schema/beans
21.        http://www.springframework.org/schema/beans/spring-beans.xsd
22.        http://www.springframework.org/schema/aop
23.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
24. >
25.     <context:component-scan base-package="AOP_auto"/>
26.     <aop:aspectj-autoproxy/>
27. </beans>
28. <?xml version="1.0" encoding="UTF-8"?>
29. <beans xmlns="http://www.springframework.org/schema/beans"
30.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
31.        xmlns:aop="http://www.springframework.org/schema/aop"
32.        xmlns:context="http://www.springframework.org/schema/context"
33.        xsi:schemaLocation="http://www.springframework.org/schema/beans
34.        http://www.springframework.org/schema/beans/spring-beans.xsd
35.        http://www.springframework.org/schema/aop
36.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
37. >
38.     <context:component-scan base-package="AOP_auto"/>
39.     <aop:aspectj-autoproxy/>
40. </beans><aop:aspect ref="MyAspect">
41. <?xml version="1.0" encoding="UTF-8"?>
42. <beans xmlns="http://www.springframework.org/schema/beans"
43.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
44.        xmlns:aop="http://www.springframework.org/schema/aop"
45.        xmlns:context="http://www.springframework.org/schema/context"
46.        xsi:schemaLocation="http://www.springframework.org/schema/beans
47.        http://www.springframework.org/schema/beans/spring-beans.xsd
48.        http://www.springframework.org/schema/aop
49.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
50. >
51.     <context:component-scan base-package="AOP_auto"/>
52.     <aop:aspectj-autoproxy/>
53. </beans>   
54. <?xml version="1.0" encoding="UTF-8"?>
55. <beans xmlns="http://www.springframework.org/schema/beans"
56.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
57.        xmlns:aop="http://www.springframework.org/schema/aop"
58.        xmlns:context="http://www.springframework.org/schema/context"
59.        xsi:schemaLocation="http://www.springframework.org/schema/beans
60.        http://www.springframework.org/schema/beans/spring-beans.xsd
61.        http://www.springframework.org/schema/aop
62.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
63. >
64.     <context:component-scan base-package="AOP_auto"/>
65.     <aop:aspectj-autoproxy/>
66. </beans>    <aop:before method="before" pointcut="execution(public void AOP.tager.add())"/>
67. <?xml version="1.0" encoding="UTF-8"?>
68. <beans xmlns="http://www.springframework.org/schema/beans"
69.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
70.        xmlns:aop="http://www.springframework.org/schema/aop"
71.        xmlns:context="http://www.springframework.org/schema/context"
72.        xsi:schemaLocation="http://www.springframework.org/schema/beans
73.        http://www.springframework.org/schema/beans/spring-beans.xsd
74.        http://www.springframework.org/schema/aop
75.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
76. >
77.     <context:component-scan base-package="AOP_auto"/>
78.     <aop:aspectj-autoproxy/>
79. </beans>    <aop:before method="before" pointcut = "execution(public void AOP.tager.*(..))"/>
80. <?xml version="1.0" encoding="UTF-8"?>
81. <beans xmlns="http://www.springframework.org/schema/beans"
82.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
83.        xmlns:aop="http://www.springframework.org/schema/aop"
84.        xmlns:context="http://www.springframework.org/schema/context"
85.        xsi:schemaLocation="http://www.springframework.org/schema/beans
86.        http://www.springframework.org/schema/beans/spring-beans.xsd
87.        http://www.springframework.org/schema/aop
88.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
89. >
90.     <context:component-scan base-package="AOP_auto"/>
91.     <aop:aspectj-autoproxy/>
92. </beans></aop:aspect>
93.     </aop:config>
94. </beans>

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• 可以使用通配符去通配整体方法
  
• pointcut可以说是和你的切点，就是你要去增强那些方法
  
• 增强的方法看aop标签有after before等等说
  

语法详解

• 返回值类型、包名、类名、方法名、可以使用*****号代替任意
  
• 包名和类名之间有一个.代表当前包下的类，两个个点代表当前包及其子包下面的类
  
• 参数列表使用两个点代表任意个数
  

0x3通知类型

前置通知：在方法执行前通知
@Before(value = “”)
//环绕通知：可以将要执行的方法（point.proceed()）进行包裹执行，可以在前后添加需要执行的操作
@Around(value = “”)
//后置通知：在方法正常执行完成进行通知，可以访问到方法的返回值的。
@AfterReturning(value = “”)
//异常通知：在方法出现异常时进行通知,可以访问到异常对象，且可以指定在出现特定异常时在执行通知。
@AfterThrowing(value = “”)
//方法执行后通知： 在目标方法执行后无论是否发生异常，执行通知,不能访问目标方法的执行的结果。
@After(value = “”)
0x03基于注解的开发

1. package AOP_auto;
3. import org.aspectj.lang.annotation.Aspect;
4. import org.aspectj.lang.annotation.Before;
5. import org.springframework.stereotype.Component;
7. @Component("MyAspect")
8. @Aspect//切面标志（增强方法）
9. public class MyAspect {
10. <?xml version="1.0" encoding="UTF-8"?>
11. <beans xmlns="http://www.springframework.org/schema/beans"
12.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
13.        xmlns:aop="http://www.springframework.org/schema/aop"
14.        xmlns:context="http://www.springframework.org/schema/context"
15.        xsi:schemaLocation="http://www.springframework.org/schema/beans
16.        http://www.springframework.org/schema/beans/spring-beans.xsd
17.        http://www.springframework.org/schema/aop
18.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
19. >
20.     <context:component-scan base-package="AOP_auto"/>
21.     <aop:aspectj-autoproxy/>
22. </beans>@Before("execution(public void AOP.tager.*(..))")
23. <?xml version="1.0" encoding="UTF-8"?>
24. <beans xmlns="http://www.springframework.org/schema/beans"
25.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
26.        xmlns:aop="http://www.springframework.org/schema/aop"
27.        xmlns:context="http://www.springframework.org/schema/context"
28.        xsi:schemaLocation="http://www.springframework.org/schema/beans
29.        http://www.springframework.org/schema/beans/spring-beans.xsd
30.        http://www.springframework.org/schema/aop
31.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
32. >
33.     <context:component-scan base-package="AOP_auto"/>
34.     <aop:aspectj-autoproxy/>
35. </beans>public void before(){
36. <?xml version="1.0" encoding="UTF-8"?>
37. <beans xmlns="http://www.springframework.org/schema/beans"
38.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
39.        xmlns:aop="http://www.springframework.org/schema/aop"
40.        xmlns:context="http://www.springframework.org/schema/context"
41.        xsi:schemaLocation="http://www.springframework.org/schema/beans
42.        http://www.springframework.org/schema/beans/spring-beans.xsd
43.        http://www.springframework.org/schema/aop
44.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
45. >
46.     <context:component-scan base-package="AOP_auto"/>
47.     <aop:aspectj-autoproxy/>
48. </beans>    System.out.println("方法执行前执行");
49. <?xml version="1.0" encoding="UTF-8"?>
50. <beans xmlns="http://www.springframework.org/schema/beans"
51.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
52.        xmlns:aop="http://www.springframework.org/schema/aop"
53.        xmlns:context="http://www.springframework.org/schema/context"
54.        xsi:schemaLocation="http://www.springframework.org/schema/beans
55.        http://www.springframework.org/schema/beans/spring-beans.xsd
56.        http://www.springframework.org/schema/aop
57.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
58. >
59.     <context:component-scan base-package="AOP_auto"/>
60.     <aop:aspectj-autoproxy/>
61. </beans>}
62. <?xml version="1.0" encoding="UTF-8"?>
63. <beans xmlns="http://www.springframework.org/schema/beans"
64.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
65.        xmlns:aop="http://www.springframework.org/schema/aop"
66.        xmlns:context="http://www.springframework.org/schema/context"
67.        xsi:schemaLocation="http://www.springframework.org/schema/beans
68.        http://www.springframework.org/schema/beans/spring-beans.xsd
69.        http://www.springframework.org/schema/aop
70.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
71. >
72.     <context:component-scan base-package="AOP_auto"/>
73.     <aop:aspectj-autoproxy/>
74. </beans>public void after(){
75. <?xml version="1.0" encoding="UTF-8"?>
76. <beans xmlns="http://www.springframework.org/schema/beans"
77.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
78.        xmlns:aop="http://www.springframework.org/schema/aop"
79.        xmlns:context="http://www.springframework.org/schema/context"
80.        xsi:schemaLocation="http://www.springframework.org/schema/beans
81.        http://www.springframework.org/schema/beans/spring-beans.xsd
82.        http://www.springframework.org/schema/aop
83.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
84. >
85.     <context:component-scan base-package="AOP_auto"/>
86.     <aop:aspectj-autoproxy/>
87. </beans>    System.out.println("方法执行后执行");
88. <?xml version="1.0" encoding="UTF-8"?>
89. <beans xmlns="http://www.springframework.org/schema/beans"
90.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
91.        xmlns:aop="http://www.springframework.org/schema/aop"
92.        xmlns:context="http://www.springframework.org/schema/context"
93.        xsi:schemaLocation="http://www.springframework.org/schema/beans
94.        http://www.springframework.org/schema/beans/spring-beans.xsd
95.        http://www.springframework.org/schema/aop
96.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
97. >
98.     <context:component-scan base-package="AOP_auto"/>
99.     <aop:aspectj-autoproxy/>
100. </beans>}
102. }

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1. @Component("tager")
2. public class tager implements tagerinterface {
4.     @Override
5.     @Autowired
6.     public void add() {
7. <?xml version="1.0" encoding="UTF-8"?>
8. <beans xmlns="http://www.springframework.org/schema/beans"
9.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
10.        xmlns:aop="http://www.springframework.org/schema/aop"
11.        xmlns:context="http://www.springframework.org/schema/context"
12.        xsi:schemaLocation="http://www.springframework.org/schema/beans
13.        http://www.springframework.org/schema/beans/spring-beans.xsd
14.        http://www.springframework.org/schema/aop
15.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
16. >
17.     <context:component-scan base-package="AOP_auto"/>
18.     <aop:aspectj-autoproxy/>
19. </beans>System.out.println("执行增加");
20.     }
22.     @Override
23.     @Autowired
24.     public void delete() {
25. <?xml version="1.0" encoding="UTF-8"?>
26. <beans xmlns="http://www.springframework.org/schema/beans"
27.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
28.        xmlns:aop="http://www.springframework.org/schema/aop"
29.        xmlns:context="http://www.springframework.org/schema/context"
30.        xsi:schemaLocation="http://www.springframework.org/schema/beans
31.        http://www.springframework.org/schema/beans/spring-beans.xsd
32.        http://www.springframework.org/schema/aop
33.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
34. >
35.     <context:component-scan base-package="AOP_auto"/>
36.     <aop:aspectj-autoproxy/>
37. </beans>System.out.println("执行删除");
39.     }
41.     @Override
42.     @Autowired
43.     public void update() {
44. <?xml version="1.0" encoding="UTF-8"?>
45. <beans xmlns="http://www.springframework.org/schema/beans"
46.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
47.        xmlns:aop="http://www.springframework.org/schema/aop"
48.        xmlns:context="http://www.springframework.org/schema/context"
49.        xsi:schemaLocation="http://www.springframework.org/schema/beans
50.        http://www.springframework.org/schema/beans/spring-beans.xsd
51.        http://www.springframework.org/schema/aop
52.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
53. >
54.     <context:component-scan base-package="AOP_auto"/>
55.     <aop:aspectj-autoproxy/>
56. </beans>System.out.println("执行更新");
58.     }
60.     @Override
61.     @Autowired
62.     public void qurey() {
63. <?xml version="1.0" encoding="UTF-8"?>
64. <beans xmlns="http://www.springframework.org/schema/beans"
65.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
66.        xmlns:aop="http://www.springframework.org/schema/aop"
67.        xmlns:context="http://www.springframework.org/schema/context"
68.        xsi:schemaLocation="http://www.springframework.org/schema/beans
69.        http://www.springframework.org/schema/beans/spring-beans.xsd
70.        http://www.springframework.org/schema/aop
71.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
72. >
73.     <context:component-scan base-package="AOP_auto"/>
74.     <aop:aspectj-autoproxy/>
75. </beans>System.out.println("执行整理");
77.     }
78. }

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配置文件

1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4.        xmlns:aop="http://www.springframework.org/schema/aop"
5.        xmlns:context="http://www.springframework.org/schema/context"
6.        xsi:schemaLocation="http://www.springframework.org/schema/beans
7.        http://www.springframework.org/schema/beans/spring-beans.xsd
8.        http://www.springframework.org/schema/aop
9.        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"
10. >
11.     <context:component-scan base-package="AOP_auto"/>
12.     <aop:aspectj-autoproxy/>
13. </beans>

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在xml文件中配置自动扫描和自动切面配置
0x04总结

AOP技术就一种动态代理技术的增强化，越学到后面发现一些原来不注意的注解和反射技术更重要。接下来会学习mvc了

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