spring Aop 实现

java 代码

package com.test;

public interface StudentService {

    public void addStudent(String name);

}

package com.test;

public class StudentServiceImpl implements StudentService{

    @Override
    public void addStudent(String name) {
        System.out.println("##增加一个姓名是"  + name + "学生!");
    }

}

package com.test;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;
//调用前增强
public class BeforeAdvice implements MethodBeforeAdvice {

    @Override
    public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("##before -- 方法调入前的操作！");
    }

}

package com.test;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;
//结束之后
public class AfterAdvice implements AfterReturningAdvice {

    @Override
    public void afterReturning(Object arg0, Method arg1, Object[] arg2,
            Object arg3) throws Throwable {
        // TODO Auto-generated method stub
        System.out.println("##after -- 方法返回之后的操作");
    }

}

package com.test;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
//环绕增强
public class CompareInterceptor implements MethodInterceptor{

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        // TODO Auto-generated method stub
        Object result = null;
        String name = invocation.getArguments()[0].toString();
        if(!name.equals("admin"))       result = invocation.proceed();
        else{
            System.out.println("admin不是学生，不能加入！");
        }
        return result;
    }

}

package com.test;
import org.springframework.aop.framework.ProxyFactoryBean;

public class AopTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        StudentService service = new StudentServiceImpl();
        ProxyFactoryBean proxy = new ProxyFactoryBean();
        try {
            proxy.setProxyInterfaces(new Class[]{com.test.StudentService.class});
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        proxy.setProxyTargetClass(false);
        proxy.setTarget(service);
        proxy.addAdvice(new BeforeAdvice());
        proxy.addAdvice(new AfterAdvice());
        proxy.addAdvice(new CompareInterceptor());
        StudentService s = (StudentService)proxy.getObject();
        s.addStudent("test");
        System.out.println("----------------------------");
        s.addStudent("admin");
    }

}

##before -- 方法调入前的操作！
##增加一个姓名是test学生!
##after -- 方法返回之后的操作
----------------------------
##before -- 方法调入前的操作！
admin不是学生，不能加入！
##after -- 方法返回之后的操作

http://blogs.warwick.ac.uk/colinyates/entry/performance_of_spring/

利用 Spring 和 EHCache 缓存结果（翻译）

http://www.blogjava.net/zhenyu/archive/2006/07/05/56849.html