注解开发

注解开发1

配置文件

<?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"
       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">

    <context:component-scan base-package="com.neuedu.demo1"></context:component-scan>

</beans>

service注解

package com.neuedu.demo1;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

//@Component(value="userService")
//<bean id="userService" class="com.neuedu.demo1.UserService" 
//      init-method="setup" destroy-method="teardown" scope="">
//  <property name="info" value="neusoft"></property>
//  <property name="userDao" ref="userDao"></property>
//</bean>
@Service("userService")
@Scope(value="singleton")
public class UserService {
    
    @Value("neusoft")
    private String info;
    
    @Autowired（自动匹配）
    @Qualifier(value="userDao")（指向哪个引用对象）
//  @Resource(name="userDao")
    private UserDao userDao;
    
    public void sayHello(){
        System.out.println("Hello spring ioc annotation"+"--"+info+"--"+userDao);
    }
    
    @PostConstruct
    public void setup(){
        System.out.println("初始化方法。。");
    }
    
    @PreDestroy
    public void teardown(){
        System.out.println("销毁方法。。");
    }
}

service注解开发时的引用对象代码

package com.neuedu.demo1;

import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;

//@Component
@Repository("userDao")
//<bean id="userDao" class="com.neuedu.demo1.UserDao">
public class UserDao {

}

测试类

package com.neuedu.demo1;

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

public class SpringTest1 {

    @Test
    public void demo1(){
        ClassPathXmlApplicationContext applicationContext = 
                new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = 
                (UserService) applicationContext.getBean("userService");
//      userService.sayHello();
        UserService userService1 = 
                (UserService) applicationContext.getBean("userService");
        System.out.println(userService);
        System.out.println(userService1);
        applicationContext.close();
    }
}

注解开发2

配置文件

<?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"
       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">

    <bean id="userService" class="com.neuedu.demo2.UserService"></bean>

</beans>

service类

package com.neuedu.demo2;

public class UserService {

    public void sayHello(){
        System.out.println("Hello Junit...");
    }
}

测试类

package com.neuedu.demo2;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:applicationContext2.xml")
public class SpringTest2 {

    @Autowired
    @Qualifier("userService")
//  @Resource(name="userService")
    private UserService userService;
    
    @Test
    public void demo1(){
        userService.sayHello();
    }
}