163 lines
4.5 KiB
Markdown
163 lines
4.5 KiB
Markdown
# spring AOP（xml配置方式）
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## 一、说明
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### 1.1 项目结构说明
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切面配置位于resources下的aop.xml文件，其中CustomAdvice是自定义切面类，OrderService是待切入的方法。
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### 1.2 依赖说明
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除了spring的基本依赖外，需要导入aop依赖包
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```xml
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<!--aop 相关依赖-->
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-aop</artifactId>
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<version>${spring-base-version}</version>
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</dependency>
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```
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## 二、spring aop
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#### 2.1 创建待切入接口及其实现类
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```java
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public interface OrderService {
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Order queryOrder(Long id);
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Order createOrder(Long id, String productName);
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}
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```
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```java
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public class OrderServiceImpl implements OrderService {
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public Order queryOrder(Long id) {
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return new Order(id, "product", new Date());
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}
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public Order createOrder(Long id, String productName) {
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// 模拟抛出异常
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// int j = 1 / 0;
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return new Order(id, "new Product", new Date());
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}
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}
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```
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#### 2.2 创建自定义切面类
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```java
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/**
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* @author : heibaiying
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* @description : 自定义切面
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*/
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public class CustomAdvice {
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//前置通知
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public void before(JoinPoint joinPoint) {
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//获取节点名称
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String name = joinPoint.getSignature().getName();
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Object[] args = joinPoint.getArgs();
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System.out.println(name + "方法调用前：获取调用参数" + Arrays.toString(args));
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}
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//后置通知(抛出异常后不会被执行)
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public void afterReturning(JoinPoint joinPoint, Object result) {
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System.out.println("后置返回通知结果" + result);
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}
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//环绕通知
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public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
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System.out.println("环绕通知-前");
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//调用目标方法
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Object proceed = joinPoint.proceed();
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System.out.println("环绕通知-后");
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return proceed;
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}
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//异常通知
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public void afterException(JoinPoint joinPoint, Exception exception) {
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System.err.println("后置异常通知:" + exception);
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}
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;
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// 后置通知 总会执行 但是不能访问到返回值
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public void after(JoinPoint joinPoint) {
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System.out.println("后置通知");
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}
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}
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```
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#### 2.3 配置切面
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:aop="http://www.springframework.org/schema/aop"
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xsi:schemaLocation="http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans.xsd
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http://www.springframework.org/schema/aop
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http://www.springframework.org/schema/aop/spring-aop.xsd">
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<!--开启后允许使用Spring AOP的@AspectJ注解 如果是纯xml配置 可以不用开启这个声明-->
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<aop:aspectj-autoproxy/>
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<!-- 1.配置目标对象 -->
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<bean name="orderService" class="com.heibaiying.service.OrderServiceImpl"/>
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<!-- 2.声明切面 -->
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<bean name="myAdvice" class="com.heibaiying.advice.CustomAdvice"/>
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<!-- 3.配置将通知织入目标对象 -->
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<aop:config>
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<!--命名切入点 关于切入点更多表达式写法可以参见README.md-->
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<aop:pointcut expression="execution(* com.heibaiying.service.OrderService.*(..))" id="cutPoint"/>
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<aop:aspect ref="myAdvice">
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<!-- 前置通知 -->
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<aop:before method="before" pointcut-ref="cutPoint"/>
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<!-- 后置通知 如果需要拿到返回值 则要指明返回值对应的参数名称-->
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<aop:after-returning method="afterReturning" pointcut-ref="cutPoint" returning="result"/>
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<!-- 环绕通知 -->
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<aop:around method="around" pointcut-ref="cutPoint"/>
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<!-- 后置异常 如果需要拿到异常 则要指明异常对应的参数名称 -->
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<aop:after-throwing method="afterException" pointcut-ref="cutPoint" throwing="exception"/>
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<!-- 最终通知 -->
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<aop:after method="after" pointcut-ref="cutPoint"/>
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</aop:aspect>
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</aop:config>
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</beans>
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```
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#### 2.4 测试切面
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```java
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@RunWith(SpringRunner.class)
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@ContextConfiguration("classpath:aop.xml")
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public class AopTest {
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@Autowired
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private OrderService orderService;
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@Test
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public void save() {
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orderService.createOrder(1283929319L, "手机");
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orderService.queryOrder(4891894129L);
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}
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}
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```
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