java - 调用方法时未给出预期结果

Question

我正在开发 spring 应用程序，我想在类中调用任何 setxx(..) 方法时触发方面 @Before。当执行 Details 类时，SetterInterceptor @Before 方面不会被执行叫。

我有以下类(class):

package com.mypack;
public class Person {
    private String id;
    private String firstName;
    private String lastName;

    public String getId() { return id; }
    public String getFirstName() { return firstName; }
    public String getLastName() { return lastName; }

    public void setId(String id) { this.id = id; }
    public void setFirstName(String firstName) { this.firstName = firstName; }
    public void setLastName(String lastName) { this.lastName = lastName; }
    public String toString() { return "Person[" + id + ",  
   + firstName + ", " + lastName+ "]"; }
}

详细信息类:

package com.mypack;
public class Details extends Person{

    private String address;
    private String contactNum;
    //getters and setters
    public String toString() { return "Details[" + address + ", 
    " + contactNum+ "]"; }

    public static void main(String[] args) {
    Details obj1 = new Details();
    obj1.setAddress("xx 202");
    obj1.setContactNum("2124551234");
    obj1.setId("242");
    obj1.setFirstName("John");
    obj1.setLastName("John");

    Details obj2 = new Details();
    obj2.setAddress("ASDf 202");
    obj2.setContactNum("234544565656");
    obj2.setId("23689");
    obj2.setFirstName("Sam");
    obj2.setLastName("S");

    System.out.println("obj1 : " + obj1);
    System.out.println("obj2 : " + obj2);

    obj2.setFirstName("Samuel");
}

}

SetterInterceptor类:

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class SetterInterceptor {
     @Before("execution(* com.mypack.Details.set*(*))")
        public void before(JoinPoint joinPoint) throws Throwable {
        Object[] signatureArgs = joinPoint.getArgs();
            for (Object signatureArg : signatureArgs) {
                Person obj = (Person) signatureArg;
                System.out.println("Before : " + obj.getFirstName() + " ---- "
                        + obj.getId());

            }

        }
}

任何输入都会有帮助。

Answer 1

来自 Spring AOP 的文档(重点是我的):

Spring AOP currently supports only method execution join points (advising the execution of methods on Spring beans)

换句话说，您想要拦截的任何方法调用都需要位于由 Spring 实例化的 bean 上。

在您的示例中，应用程序甚至不是 Spring 应用程序(您没有 ApplicationContext)，并且您使用 new 创建 Details 实例。