Spring框架 aop操作的注解方法 基于aspectj的自动注解aop方法

首先是在xml配置文件中配置好对象，然后开启aop的注解方法——即<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

xml代码如下：

<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 开启注解扫描——对象和属性 -->
<context:component-scan base-package="com.swift"></context:component-scan>

<bean id="book" class="com.swift.Book"></bean>
<bean id="adviceBook" class="com.swift.AdviceBook"></bean>

<!-- 开启aop注解方法 -->
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

<!-- 这是xml 配置文件中aop操作的方法留下
4000
对比
　　　　 <aop:config>
<aop:pointcut expression="execution(* com.swift.Book.*())" id="pointcut1"/>

<aop:aspect ref="adviceBook">
<aop:before method="before" pointcut-ref="pointcut1"/>
<aop:after-returning method="after" pointcut-ref="pointcut1"/>
<aop:around method="around" pointcut-ref="pointcut1"/>
</aop:aspect>
　　    </aop:config> -->
</beans>

上面有原来xml配置aop的方法，这时已经不用了，用作参考

被增强的类及方法，代码如下:

package com.swift;

public class Book {
public String fun() {
System.out.println("This is Book's fun()..............");
return "This is Book's fun()..............";
}
}

用于增强的类及方法，代码如下：

package com.swift;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class AdviceBook {
@Before(value="execution(* com.swift.Book.*(..))")
public String before() {
System.out.println("This is AdviceBook's before()...............");
return "This is AdviceBook's before()...............";
}
@AfterReturning(value="execution(* com.swift.Book.*(..))")
public String after() {
System.out.println("This is AdviceBook's after()...............");
return "This is AdviceBook's after()...............";
}
@Around(value="execution(* com.swift.Book.*(..))")
public String around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

System.out.println("This is AdviceBook's front()...............");

proceedingJoinPoint.proceed();

System.out.println("This is AdviceBook's end()...............");
return "This is AdviceBook's around()...............";
}

}

类的上边用@Aspect表示切面

方法前用@Before(value="表达式") 其中表达式与之前配置方法相同

最后测试类，代码如下：

package com.swift;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.swift.Book;
@WebServlet("/test")
public class ServleTest extends HttpServlet {
private static final long serialVersionUID = 1L;
public ServleTest() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.getWriter().append("Served at: ").append(request.getContextPath());
ApplicationContext context=new ClassPathXmlApplicationContext("aop.xml");
Book book=(Book)context.getBean("book");
//这个返回值，反复试验得出最后浏览上只输出This is AdviceBook's around().
response.getWriter().append(book.fun());
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}

其实就一句

response.getWriter().append(book.fun());

网页上返回值为around()中返回值，console控制台得到前后包围所有增强的输出。

如下图：