使用@AspectJ注解开发Spring AOP
2024-10-07 13:02:42
一、实体类：
Role
public class Role {
private int id;
private String roleName;
private String note;
@Override
public String toString() {
return "Role{" +
"id=" + id +
", roleName='" + roleName + '\'' +
", note='" + note + '\'' +
'}';
}
public Role() {
}
public Role(int id, String roleName, String note) {
this.id = id;
this.roleName = roleName;
this.note = note;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getRoleName() {
return roleName;
}
public void setRoleName(String roleName) {
this.roleName = roleName;
}
public String getNote() {
return note;
}
public void setNote(String note) {
this.note = note;
}
}
二、连接点（join point）
1、接口：RoleService
public interface RoleService {
void printRoleInfo(Role role);
}
2、实现类：RoleServiceImp
@Component
public class RoleServiceImpl implements RoleService {
@Override
public void printRoleInfo(Role role) {
System.out.println("id = "+role.getId()+", roleName = '"+role.getId()+"', note = '"+role.getNote()+"'");
} }
三、创建切面(Aspect)
1、方式一：
@Aspect
public class RoleAspect { @Before("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..))")
public void before() {
System.out.println("进入方法before...");
} @After("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..))")
public void after() {
System.out.println("进入方法after...");
}
@AfterReturning("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..))")
public void afterReturning() {
System.out.println("进入方法afterReturning...");
}
@AfterThrowing("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..))")
public void afterThrowing() {
System.out.println("afterThrowing...");
}
}
2、方式二：切点（Pointcut）
使用注解：@Pointcut
@Aspect
public class RoleAspect {
@Pointcut("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..))")
public void print() { } @Before("print()")
public void before() {
System.out.println("进入方法before...");
} @After("print()")
public void after() {
System.out.println("进入方法after...");
} @AfterReturning("print()")
public void afterReturning() {
System.out.println("进入方法afterReturning...");
} @AfterThrowing("print()")
public void afterThrowing() {
System.out.println("afterThrowing...");
}
}
四：配置Spring bean
方式一：采用注解java配置
@Configuration
@EnableAspectJAutoProxy//自动代理
@ComponentScan("com.wbg.springAOP.aop")
public class AopConfig {
@Bean
public RoleAspect getRoleAspct(){
return new RoleAspect();
}
}
方式二：使用XML配置
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--如同注解@EnableAspectJautoProxy-->
<aop:aspectj-autoproxy/>
<bean id="roleAspect" class="com.wbg.springAOP.aop.aspect.RoleAspect"/> <bean id="roleService" class="com.wbg.springAOP.aop.service.impl.RoleServiceImpl"/>
</beans>
五、测试：
public static void main(String[] args) {
ApplicationContext ctx = new AnnotationConfigApplicationContext(AopConfig.class);
//ApplicationContext ctx = new ClassPathXmlApplicationContext("aspectj.xml");
RoleService roleService = ctx.getBean(RoleService.class);
Role role = new Role(1,"123","55");
roleService.printRoleInfo(role);
System.out.println("--------------");
//role=null;
roleService.printRoleInfo(role);
}
1、不为空：
2、为空：
六、加入环绕通知@Around
直接在切面加入：
@Around("print()")
public void around(ProceedingJoinPoint joinPoint){
System.out.println("around======before============");
try {
joinPoint.proceed();
} catch (Throwable throwable) {
throwable.printStackTrace();
}
System.out.println("around======after============");
}
测试：
七、给通知传递参数：&& args(..)
@Before("execution(* com.wbg.springAOP.aop.service.impl.RoleServiceImpl.printRoleInfo(..)) && args(role, sort)")
八、引入（Introduction）
目的：让Role为空时不打印
1、定义接口：RoleVerifer
2、实现接口类：RoleVeriferImpl
3、把RoleVerifier加入到切面中
com.wbg.springAOP.aop.service.impl.RoleServiceImpl+ ：表示对RoleServiceImpl类进行增强
defaultImpl :代码其默认实现类，这里是RoleVerifierImpl
@DeclareParents(value = "com.wbg.springAOP.aop.service.impl.RoleServiceImpl+",defaultImpl = RoleVerifierImpl.class)
public RoleVerifier roleVerifier;
4、引入增强检查是否为空
demo:https://github.com/weibanggang/springaopstaticanddynamic
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