Cainiao learns Spring -- get the parameter value and method name by using JoinPoint for 60 s

Cainiao learns Spring -- get the parameter value and method name by using JoinPoint for 60 s

I. Overview

The implementation method of AOP has already used two methods in the previous two blogs to implement the current problem. Although we use AOP, how does the client transmit information? The JoinPoint interface is used to transmit parameters from the client to a specific implementation class.

Ii. Code demonstration.

Directory structure:

SecurityHandler. java

package com.tgb.spring;import org.aspectj.lang.JoinPoint;public class SecurityHandler{private void checkSecurity(JoinPoint joinPoint){for (int i = 0; i < joinPoint.getArgs().length; i++) {System.out.println(joinPoint.getArgs()[i]);}System.out.println(joinPoint.getSignature().getName());System.out.println("=====checkSecurity====");}}

Client. java

Package com. tgb. spring; import org. springframework. beans. factory. beanFactory; import org. springframework. context. support. classPathXmlApplicationContext; import com. tgb. spring. userManager; public class Client {public static void main (String [] args) {BeanFactory factory = new ClassPathXmlApplicationContext ("applicationContext. xml "); UserManager userManager = (UserManager) factory. getBean ("userManager"); userManager. addUser ("Zhang San", "123"); // userManager. delUser (1 );}}

UserManager. java

package com.tgb.spring;public interface UserManager {public void addUser(String username,String password);public void delUser(int userId);public String findUserById(int userId);public void modifyUser(int userId,String username,String password);}

UserManagerImpl. java

Package com. tgb. spring; public class UserManagerImpl implements UserManager {public void addUser (String username, String password) {// checkSecurity (); System. out. println ("= UserManager. addUser = ");} public void delUser (int userId) {// checkSecurity (); System. out. println ("= UserManager. delUser = ");} public String findUserById (int userId) {// checkSecurity (); System. out. println ("= UserManager. findUserById = "); return" Zhang San ";} public void modifyUser (int userId, String username, String password) {// checkSecurity (); System. out. println ("= UserManager. modifyUser = ");} // private void checkSecurity () {// System. out. println ("checkSecurity ");////}}

ApplicationContext. xml

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Iii. Summary.

We can add a JoinPoint parameter in Advice. This value is automatically passed in by spring and can be obtained from JoinPoint.