Spring --13.Spring中AOP程式設計（註解方式）
阿新 • • 發佈：2018-11-19
1、基於註解AOP入門案例
1.2、建立工程引入依賴
pom.xml
<dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> </dependency> </dependencies>
1.3、編寫Spring配置檔案
applicationContext.xml
<?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" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--開啟Spring註解掃描--> <context:component-scan base-package="com.day03"> </context:component-scan> <!--開啟aspectj自動代理--> <aop:aspectj-autoproxy> </aop:aspectj-autoproxy> </beans>
log4j.properties
### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### direct messages to file mylog.log ### log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=D:/mylog.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - for more verbose logging change 'info' to 'debug' ### log4j.rootLogger=debug, stdout, file
1.4、建立介面和實現類
UserDao.java
package com.day03.dao;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 21:48 2018/11/11
*/
public interface UserDao {
public abstract void save();
public abstract Integer delete();
public abstract Integer update(int a, int b);
public abstract void list();
}
UserDaoImpl.java
package com.day03.dao.Impl;
import com.day03.dao.UserDao;
import org.springframework.stereotype.Repository;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 21:48 2018/11/11
*/
@Repository("userDao")
public class UserDaoImpl implements UserDao {
@Override
public void save() {
System.out.println("save方法。。。。。。。。。。。");
}
@Override
public Integer delete() {
System.out.println("delete方法。。。。。。。。。。。");
return 100;
}
@Override
public Integer update(int a, int b) {
System.out.println("update......................");
int c = a + b;
return c;
}
@Override
public void list() {
//int a = 10/0;
System.out.println("List...........................");
}
}
1.5、編寫切面類
MyAspectAnno.java
package com.day03.aspect;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 9:30 2018/11/13
*/
@Component
@Aspect //表示該類是一個切面類
public class MyAspectAnno {
}1.6、編寫測試類
MyTestAnno.java
package com.day03.test;
import com.day03.dao.UserDao;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestExecutionListeners;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 9:32 2018/11/13
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext2.xml")
public class MyTestAnno {
@Autowired
private UserDao userDao;
//前置通知
@Test
public void tes1(){
userDao.save();
}
//後置通知
@Test
public void test2(){
userDao.delete();
}
//環繞通知
@Test
public void test3(){
userDao.update(5,10);
}
//異常通知
@Test
public void test4(){
userDao.list();
}
}
2、用註解來配置各種通知
前置通知、後置通知、環繞通知、異常通知、最終通知
MyAspectAnno.java切面類
package com.day03.aspect;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 9:30 2018/11/13
*/
@Component
@Aspect //表示該類是一個切面類
public class MyAspectAnno {
/**
* 前置通知方法 應用場景： 許可權控制 （許可權不足，丟擲異常）、 記錄方法呼叫資訊日誌 joinPoint:連線點，指的是被增強的那個方法
* @param jp
*/
@Before("execution(* com.day03.dao.Impl.UserDaoImpl.save(..))")
public void before(JoinPoint jp){
String username = "admin";
if (!"user".equals(username)){
throw new RuntimeException("你沒有對類"+jp.getTarget().getClass().getName()+"中的方法"+jp.getSignature().getName()+"訪問許可權！");
}
}
/**
* 後置通知方法 應用場景： ATM取款機取款後，自動下發簡訊 引數result:被增強那個方法的返回值
* returning屬性指定目標方法返回值的名字
*/
@AfterReturning(value = "execution(* com.day03.dao.Impl.UserDaoImpl.delete(..))",returning = "result")
public void afterRunnings(JoinPoint jp,Object result){
System.out.println("你在ATM機上取了："+result+"元");
}
/**
* 環繞通知方法 應用場景：事務處理
* proceedingJoinPoint
* 正在執行的連線點
* @return
*/
@Around("execution(* com.day03.dao.Impl.UserDaoImpl.update(..))")
public Object around(ProceedingJoinPoint pjp){
System.out.println("開啟事務");
Object[] args = pjp.getArgs();//獲取引數
Object proceed = null;
try {
proceed = pjp.proceed(args);
// int a = 10/0;
System.out.println("proceed = " + proceed);
System.out.println("提交事務");
} catch (Throwable throwable) {
System.out.println("回滾事務");
}
return proceed;
}
/**
* 異常通知方法、應用：異常處理
* @param ex
* 目標方法丟擲的異常
*/
@AfterThrowing(value = "execution(* com.day03.dao.Impl.UserDaoImpl.list(..))",throwing = "ex")
public void afterThroing(JoinPoint jp , Throwable ex){
throw new RuntimeException("在這個類："+jp.getTarget().getClass().getName()+"中的方法"+jp.getSignature().getName()+"丟擲異常"+ex.getMessage());
}
/**
*最終通知方法 應用場景：釋放資源 （關閉檔案、 關閉資料庫連線、 網路連線、 釋放記憶體物件 ）
*@param joinPoint 被增強的那個方法
*/
@After("execution(* com.day03.dao.Impl.UserDaoImpl.list(..))")
public void after(JoinPoint joinPoint){
System.out.println("釋放資源、對應的類為"+joinPoint.getTarget().getClass().getName()+"方法為："+joinPoint.getSignature().getName());
}
}
UserDaoImpl.java
package com.day03.dao.Impl;
import com.day03.dao.UserDao;
import org.springframework.stereotype.Repository;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 21:48 2018/11/11
*/
@Repository("userDao")
public class UserDaoImpl implements UserDao {
@Override
public void save() {
System.out.println("save方法。。。。。。。。。。。");
}
@Override
public Integer delete() {
System.out.println("delete方法。。。。。。。。。。。");
return 100;
}
@Override
public Integer update(int a, int b) {
System.out.println("update......................");
int c = a + b;
return c;
}
@Override
public void list() {
//int a = 10/0;
System.out.println("List...........................");
}
}
applicationContext.xml
<?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"
xmlns:context="http://www.springframework.org/schema/context"
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
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--開啟Spring註解掃描-->
<context:component-scan base-package="com.day03"> </context:component-scan>
<!--開啟aspectj自動代理-->
<aop:aspectj-autoproxy> </aop:aspectj-autoproxy>
</beans>MyTestAnno.java
package com.day03.test;
import com.day03.dao.UserDao;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestExecutionListeners;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* @ Author ：ShaoWei Sun.
* @ Date ：Created in 9:32 2018/11/13
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext2.xml")
public class MyTestAnno {
@Autowired
private UserDao userDao;
//前置通知
@Test
public void tes1(){
userDao.save();
}
//後置通知
@Test
public void test2(){
userDao.delete();
}
//環繞通知
@Test
public void test3(){
userDao.update(5,10);
}
//異常通知
@Test
public void test4(){
userDao.list();
}
}