首先是在<??><beans ="http://www.springframework.org/schema/beans" ="http://www.w3.org/2001/ ="http://www.springfram ...
首先是在
<??><beans ="http://www.springframework.org/schema/beans" ="http://www.w3.org/2001/ ="http://www.springframework.org/schema/context" ="http://www.springframework.org/schema/aop" xsi:schemaLocation=" >> <!-- 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 <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
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;@Aspectpublic 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.ClassPathimport 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 ClassPath); 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:
原标题:Spring框架 aop操作的注解方法 基于aspectj的自动注解aop方法
关键词:ASP
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