Sping--AOP--XML

IoC: annotation

AOP: XML

XML比annotation用的多.

beans.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: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-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
	<context:annotation-config />
	<context:component-scan base-package="com.bjsxt"/>

	<bean id="logInterceptor" class="com.bjsxt.aop.LogInterceptor"></bean>
	<aop:config>
		<aop:aspect id="logAspect" ref="logInterceptor">
			<aop:before method="before" pointcut="execution(public * com.bjsxt.service..*.add(..))" />
		</aop:aspect>
	</aop:config>
</beans>

LogInterceptor.java:

package com.bjsxt.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

//@Aspect
//@Component
public class LogInterceptor {
	//@Pointcut("execution(public * com.bjsxt.service..*.add(..))")
	public void myMethod(){};

	//@Before("myMethod()")
	public void before() {
		System.out.println("method before");
	}

	//@Around("myMethod()")
	public void aroundMethod(ProceedingJoinPoint pjp) throws Throwable {
		System.out.println("method around start");
		pjp.proceed();
		System.out.println("method around end");
	}

}

UserServiceTest.java:

package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection
//Inverse of Control
public class UserServiceTest {

	@Test
	public void testAdd() throws Exception {
		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

		UserService service = (UserService)ctx.getBean("userService");
		System.out.println(service.getClass());
		service.add(new User());

		ctx.destroy();

	}
}

　　

UserService.java:

package com.bjsxt.service;
import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("userService")
public class UserService {

	private UserDAO userDAO;  

	public void init() {
		System.out.println("init");
	}

	public void add(User user) {
		userDAO.save(user);
	}
	public UserDAO getUserDAO() {
		return userDAO;
	}
	@Resource(name="u")
	public void setUserDAO( UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	public void destroy() {
		System.out.println("destroy");
	}
}

　　

UserDAOImpl.java:

package com.bjsxt.dao.impl;

import org.springframework.stereotype.Component;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("u")
public class UserDAOImpl implements UserDAO {

	public void save(User user) {
		//Hibernate
		//JDBC
		//XML
		//NetWork
		System.out.println("user saved!");
		//throw new RuntimeException("exeption!");
	}

}

UserDAO.java:

package com.bjsxt.dao;
import com.bjsxt.model.User;

public interface UserDAO {
	public void save(User user);
}

User.java:

package com.bjsxt.model;

public class User {
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

　　

XML方式好? annotation方式好?

XML必须掌握, 因为　

　　

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