Spring的注入方式

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ApplicationContext

@Resource注解

在Spring容器中通过name或者type来查找Bean的实例，使用该注解时Spring容器要已经加载了该bean。即xxxbean.xml中配置的bean已经被Spring容器初始化，例如通过ApplicationContext加载该配置文件。
对于测试，可以通过使用Spring提供的@RunWith和@ContextConfiguration注解来模拟容器初始化。例如：

/* * Copyright (c) 2016, 2101, Alibaba Group. All rights reserved. */package com.taobao.payment.pay;import com.taobao.hsf.standalone.HSFEasyStarter;import org.junit.runner.RunWith;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;/** * Created with IntelliJ IDEA, love and passion of Huijin Payment Team. * * @author: xiwei.cw * Date: 2016/6/15 * Time: 16:52 * Description: 基础的服务测试类 */@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration({"classpath*:META-INF/spring/spring-dao.xml",        "classpath*:META-INF/spring/spring-delegate-support.xml",        "classpath*:META-INF/spring/spring-proxy-provider.xml",        "classpath*:META-INF/spring/spring-hsf-consumer-channel.xml",        "classpath*:META-INF/spring/spring-persistence.xml",        "classpath*:META-INF/spring/spring-tddl.xml",        "classpath*:META-INF/spring/spring-domain.xml",        "classpath*:META-INF/spring/spring-notify-publisher.xml",        "classpath*:spring/spring-service-4test.xml"})public class BaseServiceTest {    static{        System.setProperty("project.name", "payment");        //LogUtil.info("##################startpando######");        HSFEasyStarter.startWithVersion("2.1.0.7");    }}

这样使用@Resource就不会报npe(空指针异常)

@Autowired注解

default-autowired属性加InitializingBean接口

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