Sping--AOP--Annotation
Aspectj 概念:
1. joinpoint:切入点, 比如@Before, @After, @Around
2. Pointcut:切入点集合, 比如 @Pointcut("execution(public * com.bjsxt.service..*.*(..))")
public void myMethod(){}; //切入点集合的名字
3. Aspect:切面逻辑, 切面类, 比如LogInterceptor之前加入的@Aspect
4. Advice: 加入点的建议, 类似于Aspect的逻辑, 相当于@Before, 加在切入点的建议.
5. Target: 被代理对象, 逻辑织入哪里...
6. Weave: 织入
AOP的Annotation方式:
1. 加上对应的xsd文件sprin-aop.xsd
2. beans.xml <aop:aspectj-autoproxy/>
3. 此时就可以解析对应的annotation了
4. 建立我们的拦截类
5. 用@Aspect注解这个类
6. 用@Before来注解方法
7. 写明白切入点(execution...)
8. 让spring对我们的拦截器类进行管理 @Component
常见的annotation:
1. @Pointcut
2. @Before
3. @AfterReturning
4. @AfterThrowing
5. @After
6. @Around
beans.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<context:annotation-config />
<context:component-scan base-package="com.bjsxt"/>
<aop:aspectj-autoproxy />
</beans>
LogInterceptor.java: 注意@Component
package com.bjsxt.aop; import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component; @Aspect
@Component
public class LogInterceptor {
@Before("execution(public * com.bjsxt.dao..*.*(..)))")
public void before() {
System.out.println("method before");
}
@AfterReturning("execution(public * com.bjsxt.dao..*.*(..)))")
public void AfterReturning() {
System.out.println("method after returning");
}
}
简化成下面写法:
package com.bjsxt.aop; import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component; @Aspect
@Component
public class LogInterceptor {
@Pointcut("execution(public * com.bjsxt.dao..*.*(..))")
public void myMethod(){};
@Before("myMethod()")
public void before() {
System.out.println("method before");
}
@AfterReturning("myMethod()")
public void AfterReturning() {
System.out.println("method after Returning");
}
}
UserServiceTest.java:
package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.bjsxt.model.User; //Dependency Injection
//Inverse of Control
public class UserServiceTest { @Test
public void testAdd() throws Exception {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService)ctx.getBean("userService");
System.out.println(service.getClass());
service.add(new User());
ctx.destroy();
}
}
UserService.java:
package com.bjsxt.service;
import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User; @Component("userService")
public class UserService { private UserDAO userDAO; public void init() {
System.out.println("init");
} public void add(User user) {
userDAO.save(user);
}
public UserDAO getUserDAO() {
return userDAO;
} @Resource(name="u")
public void setUserDAO( UserDAO userDAO) {
this.userDAO = userDAO;
}
public void destroy() {
System.out.println("destroy");
}
}
UserDAOImpl.java:
package com.bjsxt.dao.impl; import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User; @Component("u")
public class UserDAOImpl implements UserDAO { public void save(User user) {
//Hibernate
//JDBC
//XML
//NetWork
System.out.println("user saved!");
//throw new RuntimeException("exeption!");
} }
UserDAO.java:
package com.bjsxt.dao;
import com.bjsxt.model.User;
public interface UserDAO {
public void save(User user);
}
User.java:
package com.bjsxt.dao;
import com.bjsxt.model.User; public interface UserDAO {
public void save(User user);
}
结果:
class com.bjsxt.service.UserService
method before
user saved!
method after Returning
LogInterceptor.java的around用法:
package com.bjsxt.aop; import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component; @Aspect
@Component
public class LogInterceptor {
@Pointcut("execution(public * com.bjsxt.dao..*.*(..))")
public void myMethod(){}; @Before("myMethod()")
public void before() {
System.out.println("method before");
} @Around("myMethod()")
public void aroundMethod(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("method around start");
pjp.proceed();
System.out.println("method around end");
} }
beans.xml: XML catalog里引入 aop的 xsd
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<context:annotation-config />
<context:component-scan base-package="com.bjsxt"/>
<aop:aspectj-autoproxy />
</beans>
UserServiceTest.java:
package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import com.bjsxt.model.User; //Dependency Injection
//Inverse of Control
public class UserServiceTest { @Test
public void testAdd() throws Exception {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); UserService service = (UserService)ctx.getBean("userService");
System.out.println(service.getClass());
service.add(new User());
service.delete();
ctx.destroy(); } }
UserService.java:
package com.bjsxt.service;
import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User; @Component("userService")
public class UserService { private UserDAO userDAO; public void init() {
System.out.println("init");
} public void add(User user) {
userDAO.save(user);
}
public void delete() {
userDAO.delete();
}
public UserDAO getUserDAO() {
return userDAO;
} @Resource(name="u")
public void setUserDAO( UserDAO userDAO) {
this.userDAO = userDAO;
}
public void destroy() {
System.out.println("destroy");
}
}
UserDAOImpl.java:
package com.bjsxt.dao.impl; import org.springframework.stereotype.Component; import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User; @Component("u")
public class UserDAOImpl implements UserDAO { public void save(User user) {
System.out.println("user saved!");
//throw new RuntimeException("exeption!");
}
public void delete() {
System.out.println("user delete!");
//throw new RuntimeException("exeption!");
}
}
UserDAO.java :
package com.bjsxt.dao;
import com.bjsxt.model.User;
public interface UserDAO {
public void save(User user);
public void delete();
}
结果:
class com.bjsxt.service.UserService$$EnhancerByCGLIB$$b6531e3e
method around start
method before
user saved!
method around end
method around start
method before
user delete!
method around end
改成service的话, 因为没有实现接口, 所以需要 引入一个包: cglib-nodep-2.1_3.jar
package com.bjsxt.aop; import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component; @Aspect
@Component
public class LogInterceptor {
@Pointcut("execution(public * com.bjsxt.service..*.add(..))")
public void myMethod(){}; @Before("myMethod()")
public void before() {
System.out.println("method before");
} @Around("myMethod()")
public void aroundMethod(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("method around start");
pjp.proceed();
System.out.println("method around end");
} }
结果:
class com.bjsxt.service.UserService$$EnhancerByCGLIB$$9160c20d
method around start
method before
user saved!
method around end
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