Java基础-SSM之Spring的POJO（Plain Old Java Object）实现AOP
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IT文章
•
2022-08-24 23:58:43
Java基础-SSM之Spring的POJO（Plain Old Java Object）实现AOP
作者：尹正杰
版权声明：原创作品，谢绝转载！否则将追究法律责任。
上次我分享过Spring传统的AOP编程（https://www.cnblogs.com/yinzhengjie/p/9288904.html），也知道AOP编程的其实就是动态代理模式。而本篇博客介绍的是另外一种实现AOP编程的方式，即：直接通过XML和POJO的方式实现AOP编程。
一.xml-pojo实现AOP
1>.配置Maven依赖
1 <?xml version="1.0" encoding="UTF-8"?>
2 <project xmlns="http://maven.apache.org/POM/4.0.0"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
5 <modelVersion>4.0.0</modelVersion>
6
7 <groupId>cn.org.yinzhengjie</groupId>
8 <artifactId>MySpring</artifactId>
9 <version>1.0-SNAPSHOT</version>
10
11 <dependencies>
12 <dependency>
13 <groupId>junit</groupId>
14 <artifactId>junit</artifactId>
15 <version>4.11</version>
16 </dependency>
17 <dependency>
18 <groupId>org.springframework</groupId>
19 <artifactId>spring-context-support</artifactId>
20 <version>4.3.5.RELEASE</version>
21 </dependency>
22 <dependency>
23 <groupId>aopalliance</groupId>
24 <artifactId>aopalliance</artifactId>
25 <version>1.0</version>
26 </dependency>
27 <dependency>
28 <groupId>org.aspectj</groupId>
29 <artifactId>aspectjrt</artifactId>
30 <version>1.6.1</version>
31 </dependency>
32 <dependency>
33 <groupId>org.aspectj</groupId>
34 <artifactId>aspectjweaver</artifactId>
35 <version>1.8.10</version>
36 </dependency>
37 </dependencies>
38 </project>
2>.编写Spring的XML配置文件（aop.xml）
1 <?xml version="1.0"?>
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 xmlns:tx="http://www.springframework.org/schema/tx"
7 xsi:schemaLocation="http://www.springframework.org/schema/beans
8 http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
9 http://www.springframework.org/schema/aop
10 http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
11 http://www.springframework.org/schema/context
12 http://www.springframework.org/schema/context/spring-context-4.3.xsd
13 http://www.springframework.org/schema/tx
14 http://www.springframework.org/schema/tx ">
15 <!-- 目标对象 -->
16 <bean id="singer" class="cn.org.yinzhengjie.spring.aop.Singer"/>
17
18 <!-- 观众 -->
19 <bean id="audience" class="cn.org.yinzhengjie.spring.aop.Audience"/>
20
21 <aop:config>
22 <aop:aspect id="audienceAspect" ref="audience">
23 <!--
24 pointcut : 表示的是切入点;
25 id : 给切入点定义一个标签，这个id的值为audiencePointcut，别人可以通过pointcut-ref属性来引用当前的pointcut切入点；
26 expression : 表示定义表达式；
27 * : 匹配返回值，表示通配符，即返回值类型不限制
28 cn.org.yinzhengjie.spring.aop.Actor.show(..) : 表示执行的方法，需要写完整类名，其中“..”表示参数不限制。
29 -->
30 <aop:pointcut id="audiencePointcut" expression="execution(* cn.org.yinzhengjie.spring.aop.Actor.show(..))"/>
31 <!--
32 before : 前置通知,表示的是在执行方法之前需要执行的代码。
33 pointcut-ref : 指定切入点链接；
34 method : 表示触发切入点的方法，即切入点在哪个方法中触发；
35 -->
36 <aop:before pointcut-ref="audiencePointcut" method="sitDown"/>
37 <aop:before pointcut-ref="audiencePointcut" method="turnOffCellPhone"/>
38 <!--
39 after-returning : 后置通知：主要负责处理调用目标对象之后的执行代码；
40 pointcut-ref : 指定切入点链接；
41 method : 表示触发切入点的方法，即切入点在哪个方法中触发；
42 -->
43 <aop:after-returning pointcut-ref="audiencePointcut" method="clap"/>
44 <!--
45 after-throwing : 异常通知。它执行的优先级暂时没法确定，而且不一定执行，顾名思义，它是在有异常的时候才会触发的代码！因此即
46 使你写了这样的通知，有可能你看不到它的执行结果，除非你故意写一段可能出现异常的代码；
47 -->
48 <aop:after-throwing pointcut-ref="audiencePointcut" method="payOff"/>
49 <!--
50 after : 最终通知，相当于java异常处理的fanaly代码块，无论如何都会执行的操作；
51 -->
52 <aop:after pointcut-ref="audiencePointcut" method="goHome"/>
53 </aop:aspect>
54 </aop:config>
55 </beans>
3>.编写测试代码
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop;
7
8 /**
9 * 演员接口
10 */
11 public interface Actor {
12 public void show();
13 }
Actor.java 文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop;
7
8 /**
9 * 歌手,目标类
10 */
11 public class Singer implements Actor {
12 public void show() {
13 System.out.println("I'm yinzhengjie!");
14 // String ss = null;
15 // ss.toLowerCase() ;
16 }
17 }
Singer.java 文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop;
7
8 /**
9 * 观众类
10 */
11 public class Audience {
12
13 public void sitDown(){
14 System.out.println("sitDown");
15 }
16 public void turnOffCellPhone(){
17 System.out.println("turnOffCellPhone");
18 }
19 public void clap(){
20 System.out.println("clap");
21 }
22 public void payOff(){
23 System.out.println("payOff");
24 }
25 public void goHome(){
26 System.out.println("goHome");
27 }
28 }
Audience.java 文件内容
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop;
7
8 import org.springframework.context.ApplicationContext;
9 import org.springframework.context.support.ClassPathXmlApplicationContext;
10
11 public class App {
12 public static void main(String[] args) {
13 //加载类的路径XMl配置文件，实例化容器。得到ApplicationContext的对象ac，我们将文件放在“resource”目录下。否则会抛异常找不到文件哟！
14 ApplicationContext ac = new ClassPathXmlApplicationContext("aop.xml");
15 //通过该ac的getBean方法获取到配置文件中的bean标签的指定id为"singer"的对象，由于返回的是Object对象,因此我们需要强转一下。
16 Actor actor = (Actor) ac.getBean("singer");
17 //调用actor对象的show方法。
18 actor.show();
19 }
20 }
以上代码执行结果如下：
二.xml-pojo实现AOP(环绕通知)
1>.配置Maven依赖
1 <?xml version="1.0" encoding="UTF-8"?>
2 <project xmlns="http://maven.apache.org/POM/4.0.0"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
5 <modelVersion>4.0.0</modelVersion>
6
7 <groupId>cn.org.yinzhengjie</groupId>
8 <artifactId>MySpring</artifactId>
9 <version>1.0-SNAPSHOT</version>
10
11 <dependencies>
12 <dependency>
13 <groupId>junit</groupId>
14 <artifactId>junit</artifactId>
15 <version>4.11</version>
16 </dependency>
17 <dependency>
18 <groupId>org.springframework</groupId>
19 <artifactId>spring-context-support</artifactId>
20 <version>4.3.5.RELEASE</version>
21 </dependency>
22 <dependency>
23 <groupId>aopalliance</groupId>
24 <artifactId>aopalliance</artifactId>
25 <version>1.0</version>
26 </dependency>
27 <dependency>
28 <groupId>org.aspectj</groupId>
29 <artifactId>aspectjrt</artifactId>
30 <version>1.6.1</version>
31 </dependency>
32 <dependency>
33 <groupId>org.aspectj</groupId>
34 <artifactId>aspectjweaver</artifactId>
35 <version>1.8.10</version>
36 </dependency>
37 </dependencies>
38 </project>
2>.编写Spring的XML配置文件（aop2.xml）
1 <?xml version="1.0"?>
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 xmlns:tx="http://www.springframework.org/schema/tx"
7 xsi:schemaLocation="http://www.springframework.org/schema/beans
8 http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
9 http://www.springframework.org/schema/aop
10 http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
11 http://www.springframework.org/schema/context
12 http://www.springframework.org/schema/context/spring-context-4.3.xsd
13 http://www.springframework.org/schema/tx
14 http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
15 <!-- 目标对象 -->
16 <bean id="singer" class="cn.org.yinzhengjie.spring.aop2.Singer" />
17
18 <!-- 观众 -->
19 <bean id="audience" class="cn.org.yinzhengjie.spring.aop2.Audience" />
20
21 <aop:config>
22 <aop:aspect id="audienceAspect" ref="audience">
23 <!--
24 * :统配返回值
25 *. :任何包以及子包
26 . :包和类的分割
27 Actor:类或者接口
28 .* : 类或者接口中的任何方法
29 (..) : 参数不限
30 -->
31 <aop:around method="watch" pointcut="execution(* *..Actor.*(..))" />
32 </aop:aspect>
33 </aop:config>
34 </beans>
3>.编写测试代码
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop2;
7
8 /**
9 * 演员接口
10 */
11 public interface Actor {
12 public void show();
13 }
Actor.java 文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop2;
7
8 /**
9 * 歌手,目标类
10 */
11 public class Singer implements Actor {
12 public void show() {
13 System.out.println("我有一只小毛驴,从来也不骑.......");
14 //模拟异常
15 // String ss = null;
16 // ss.toLowerCase() ;
17 }
18 }
Singer.java 文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop2;
7
8 import org.aspectj.lang.ProceedingJoinPoint;
9
10 /**
11 * 观众
12 */
13 public class Audience {
14
15 /**
16 * 观看表演
17 */
18 public Object watch(ProceedingJoinPoint pjp){
19 try {
20 System.out.println("sitDown");
21 System.out.println("turnOffCellPhone");
22 Object ret = pjp.proceed();
23 System.out.println("clap");
24 return ret ;
25 } catch (Throwable e) {
26 System.out.println("payOff");
27 }
28 finally {
29 System.out.println("goHome");
30 }
31 return null ;
32 }
33 }
Audience.java 文件内容
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.aop2;
7
8 import org.springframework.context.ApplicationContext;
9 import org.springframework.context.support.ClassPathXmlApplicationContext;
10
11 public class App {
12 public static void main(String[] args) {
13 ApplicationContext ac = new ClassPathXmlApplicationContext("aop2.xml");
14 Actor actor = (Actor) ac.getBean("singer");
15 actor.show();
16 }
17 }
以上代码执行结果如下：
三.注解方式配置spring
注解是为了给类或者方法加上标记，注解是是可以通过编程提取的，它和注释可不一样哟！
1>.导入Maven依赖
1 <?xml version="1.0" encoding="UTF-8"?>
2 <project xmlns="http://maven.apache.org/POM/4.0.0"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
5 <modelVersion>4.0.0</modelVersion>
6
7 <groupId>cn.org.yinzhengjie</groupId>
8 <artifactId>MySpring</artifactId>
9 <version>1.0-SNAPSHOT</version>
10
11 <dependencies>
12 <dependency>
13 <groupId>junit</groupId>
14 <artifactId>junit</artifactId>
15 <version>4.11</version>
16 </dependency>
17 <dependency>
18 <groupId>org.springframework</groupId>
19 <artifactId>spring-context-support</artifactId>
20 <version>4.3.5.RELEASE</version>
21 </dependency>
22 <dependency>
23 <groupId>aopalliance</groupId>
24 <artifactId>aopalliance</artifactId>
25 <version>1.0</version>
26 </dependency>
27 <dependency>
28 <groupId>org.aspectj</groupId>
29 <artifactId>aspectjrt</artifactId>
30 <version>1.6.1</version>
31 </dependency>
32 <dependency>
33 <groupId>org.aspectj</groupId>
34 <artifactId>aspectjweaver</artifactId>
35 <version>1.8.10</version>
36 </dependency>
37 </dependencies>
38 </project>
2>.编写Spring的XML配置文件（aop.xml）
1 <?xml version="1.0"?>
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 xmlns:tx="http://www.springframework.org/schema/tx"
7 xsi:schemaLocation="http://www.springframework.org/schema/beans
8 http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
9 http://www.springframework.org/schema/aop
10 http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
11 http://www.springframework.org/schema/context
12 http://www.springframework.org/schema/context/spring-context-4.3.xsd
13 http://www.springframework.org/schema/tx
14 http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
15 <!-- 配置组件扫描(目的是扫描出加了注解的类或者包) -->
16 <context:component-scan base-package="cn.org.yinzhengjie.spring.service" />
17
18 </beans>
3>.编写代码
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.service;
7
8 public interface ByeService {
9 public void sayBye() ;
10 }
ByeService.java 接口文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.service;
7
8 public interface WelcomeService {
9 public void sayHello() ;
10 }
WelcomeService.java 接口文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.service;
7
8 import org.springframework.stereotype.Service;
9
10 @Service
11 public class ByeServiceImpl implements ByeService{
12 private String bye ;
13
14 public ByeServiceImpl(){
15 System.out.println("new ByeServiceImpl()");
16 }
17
18 public String getBye() {
19 return bye;
20 }
21
22 public void setBye(String bye) {
23 this.bye = bye;
24 }
25
26 public void sayBye() {
27 System.out.println(bye);
28 }
29 }
ByeServiceImpl.java 文件内容
![]()
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.service;
7
8 import org.springframework.context.annotation.Scope;
9 import org.springframework.stereotype.Service;
10
11 import javax.annotation.Resource;
12
13 @Service("yinzhengjie") //注解是可以指定名称的，如果不指定会默认为当前类名并且首字母会小写！
14 @Scope("prototype") //指定Spring bean的范围为原型模式（"prototype"）
15 public class WelcomeServiceImpl implements WelcomeService{
16 private String name ;
17
18 private ByeService bs ;
19 public WelcomeServiceImpl(){
20 System.out.println("new WelcomeServiceImpl()");
21 }
22 public ByeService getBs() {
23 return bs;
24 }
25
26 //注入依赖,使用关键字name指定具体注入注解，当然也可以不在方法中注入，我们也可以在字段中注入哟！
27 @Resource(name="byeServiceImpl")
28 public void setBs(ByeService bs) {
29 System.out.println("正在注入 : byeServiceImpl");
30 this.bs = bs;
31 }
32 public String getName() {
33 return name;
34 }
35 public void setName(String name) {
36 this.name = name;
37 }
38 public void sayHello() {
39 bs.sayBye();
40 System.out.println("I'm yinzhengjie !!!");
41 }
42 }
WelcomeServiceImpl.java 文件内容
1 /*
2 @author :yinzhengjie
3 Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/
4 EMAIL:y1053419035@qq.com
5 */
6 package cn.org.yinzhengjie.spring.service;
7
8 import org.springframework.context.ApplicationContext;
9 import org.springframework.context.support.ClassPathXmlApplicationContext;
10
11
12 public class App {
13 public static void main(String[] args) {
14 ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
15 WelcomeService ws = (WelcomeService) ac.getBean("yinzhengjie");
16 ws.sayHello();
17 ByeService bs = (ByeService) ac.getBean("byeServiceImpl");
18 System.out.println(bs);
19
20 }
21 }
以上代码执行结果如下：
