Spring AOP系列--AOP+注解 实例
发布日期：2021-05-10 13:43:50
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其他网址
另见《深入浅出Spring Boot 2.x》=> 4.3 AOP开发详解
简介
因为AOP可以将切点设为注解类，因此，若想控制Controller，只需要控制@RequestMapping，即：
@Pointcut("@annotation(org.springframework.web.bind.annotation.RequestMapping)") 创建工程
本文工程全部源码：
pom.xml
4.0.0 org.springframework.boot spring-boot-starter-parent 2.3.1.RELEASE com.example demo_springaop-simple 0.0.1-SNAPSHOT demo_springaop-simple Demo project for Spring Boot 1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-aop org.springframework.boot spring-boot-starter-test test org.projectlombok lombok 1.16.20 provided org.springframework.boot spring-boot-maven-plugin
公共代码
注解类
package com.example.demo.annotation;import java.lang.annotation.*;@Target({ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface OperationLog { //操作的类型，添加，更新，删除 String type() default "add"; //操作描述 String desc() default "";}
Controller
package com.example.demo.controller;import com.example.demo.annotation.OperationLog;import com.example.demo.entity.User;import com.example.demo.service.UserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;@RequestMapping("/user")@Controllerpublic class UserController { @Autowired UserService userService; @RequestMapping("/print") @ResponseBody public User testPrint(User user) { userService.printUser(user); return user; } @RequestMapping("/add") @ResponseBody @OperationLog(type = "添加", desc = "添加数据") public User testAdd(User user) { return user; } @RequestMapping("/update") @ResponseBody @OperationLog(type = "更新", desc = "更新数据") public User testUpdate(User user) { userService.printUser(user); return user; }} Entity
package com.example.demo.entity;import lombok.Data;@Datapublic class User { private Integer id; private String userName; private String note;} Service
package com.example.demo.service;import com.example.demo.entity.User;public interface UserService { public void printUser(User user);} package com.example.demo.service.impl;import com.example.demo.entity.User;import com.example.demo.service.UserService;import org.springframework.stereotype.Service;@Servicepublic class UserServiceImpl implements UserService { @Override public void printUser(User user) { if (user == null) { throw new RuntimeException("检查用户参数是否为空"); } System.out.print("id = " + user.getId()); System.out.print("\t userName = " + user.getUserName()); System.out.println("\t note = " + user.getNote()); }} 启动类
package com.example.demo;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoSpringaopSimpleApplication { public static void main(String[] args) { SpringApplication.run(DemoSpringaopSimpleApplication.class, args); }} 单入参有返回值
package com.example.demo.aspect;import com.example.demo.annotation.OperationLog;import com.example.demo.entity.User;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import java.lang.annotation.Annotation;import java.lang.reflect.Method;import java.text.SimpleDateFormat;@Aspect@Componentpublic class OperationLogAspect { //切点表达式，表示加了OperationLog注解的都是切点，路径是自定义注解的全路径 @Pointcut("@annotation(com.example.demo.annotation.OperationLog)") public void pointcut() { }// 有ProceedingJoinPoint无注解类，有返回值 @Around("pointcut()") public Object around1(ProceedingJoinPoint joinPoint) throws Throwable { MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); Method method = methodSignature.getMethod(); System.out.println("joinPoint.getTarget().toString() : " + joinPoint.getTarget().toString()); System.out.println("methodSignature.getName() : " + methodSignature.getName()); System.out.println("method.getName() : " + method.getName()); System.out.println("method.getReturnType().getName() : " + method.getReturnType().getName()); System.out.println("-----------------------------------------------"); Object object = joinPoint.proceed(); OperationLog operationLog = method.getAnnotation(OperationLog.class); System.out.print("type: " + operationLog.type()); System.out.println("\tdesc: " + operationLog.desc()); System.out.println("-----------------------------------------------"); Object[] objects = joinPoint.getArgs(); for (Object o : objects) { System.out.println(o); if (o instanceof User) { System.out.println("id是：" + ((User)(o)).getId() + "; 名字是：" + ((User)(o)).getUserName() + "; 备注是：" + ((User)(o)).getNote()); } } return object; }} 测试
postman访问：
后端结果
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@10852612methodSignature.getName() : testAddmethod.getName() : testAddmethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------type: 添加 desc: 添加数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
{ "id": 321, "userName": "Tony", "note": "abc"}
postman访问：
后端结果
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@10852612methodSignature.getName() : testUpdatemethod.getName() : testUpdatemethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------id = 321 userName = Tony note = abctype: 更新 desc: 更新数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
{ "id": 321, "userName": "Tony", "note": "abc"}
双参数有返回值
package com.example.demo.aspect;import com.example.demo.annotation.OperationLog;import com.example.demo.entity.User;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import java.lang.annotation.Annotation;import java.lang.reflect.Method;import java.text.SimpleDateFormat;@Aspect@Componentpublic class OperationLogAspect { //切点表达式，表示加了OperationLog注解的都是切点，路径是自定义注解的全路径 @Pointcut("@annotation(com.example.demo.annotation.OperationLog)") public void pointcut() { }// 有ProceedingJoinPoint和注解类，有返回值 @Around("@annotation(operationLog)") public Object around2(ProceedingJoinPoint joinPoint, OperationLog operationLog) throws Throwable{ MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); Method method = methodSignature.getMethod(); System.out.println("joinPoint.getTarget().toString() : " + joinPoint.getTarget().toString()); System.out.println("methodSignature.getName() : " + methodSignature.getName()); System.out.println("method.getName() : " + method.getName()); System.out.println("method.getReturnType().getName() : " + method.getReturnType().getName()); System.out.println("-----------------------------------------------"); Object object = joinPoint.proceed(); System.out.println("method.getName(): " + method.getName()); System.out.print("type: " + operationLog.type()); System.out.println("\tdesc: " + operationLog.desc()); System.out.println("-----------------------------------------------"); Object[] objects = joinPoint.getArgs(); for (Object o : objects) { System.out.println(o); if (o instanceof User) { System.out.println("id是：" + ((User)(o)).getId() + "; 名字是：" + ((User)(o)).getUserName() + "; 备注是：" + ((User)(o)).getNote()); } } return object; }} 测试
postman访问：
后端结果
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@36efe205methodSignature.getName() : testAddmethod.getName() : testAddmethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------method.getName(): testAddtype: 添加 desc: 添加数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
{ "id": 321, "userName": "Tony", "note": "abc"}
postman访问：
后端结果
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@36efe205methodSignature.getName() : testUpdatemethod.getName() : testUpdatemethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------id = 321 userName = Tony note = abcmethod.getName(): testUpdatetype: 更新 desc: 更新数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
{ "id": 321, "userName": "Tony", "note": "abc"}
单入参无返回值
package com.example.demo.aspect;import com.example.demo.annotation.OperationLog;import com.example.demo.entity.User;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import java.lang.annotation.Annotation;import java.lang.reflect.Method;import java.text.SimpleDateFormat;@Aspect@Componentpublic class OperationLogAspect { //切点表达式，表示加了OperationLog注解的都是切点，路径是自定义注解的全路径 @Pointcut("@annotation(com.example.demo.annotation.OperationLog)") public void pointcut() { }// 有ProceedingJoinPoint无注解类，无返回值 @Around("pointcut()") public void around3(ProceedingJoinPoint joinPoint) throws Throwable { MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); Method method = methodSignature.getMethod(); System.out.println("joinPoint.getTarget().toString() : " + joinPoint.getTarget().toString()); System.out.println("methodSignature.getName() : " + methodSignature.getName()); System.out.println("method.getName() : " + method.getName()); System.out.println("method.getReturnType().getName() : " + method.getReturnType().getName()); System.out.println("-----------------------------------------------"); Object object = joinPoint.proceed(); OperationLog operationLog = method.getAnnotation(OperationLog.class); System.out.print("type: " + operationLog.type()); System.out.println("\tdesc: " + operationLog.desc()); System.out.println("-----------------------------------------------"); Object[] objects = joinPoint.getArgs(); for (Object o : objects) { System.out.println(o); if (o instanceof User) { System.out.println("id是：" + ((User)(o)).getId() + "; 名字是：" + ((User)(o)).getUserName() + "; 备注是：" + ((User)(o)).getNote()); } } }} 测试
postman访问：
后端结果：
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@71e616a3methodSignature.getName() : testAddmethod.getName() : testAddmethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------type: 添加 desc: 添加数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
无
postman访问：
后端结果：
joinPoint.getTarget().toString() : com.example.demo.controller.UserController@71e616a3methodSignature.getName() : testUpdatemethod.getName() : testUpdatemethod.getReturnType().getName() : com.example.demo.entity.User-----------------------------------------------id = 321 userName = Tony note = abctype: 更新 desc: 更新数据-----------------------------------------------User(id=321, userName=Tony, note=abc)id是：321; 名字是：Tony; 备注是：abcpostman结果
无
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