failed to load applicationContext

用spring4做个单元测试，报failed to load applicationContext

代码如下：

1.接口

package com.springinaction.test;

public interface CompactDisc {
public void play();
}

2.实现类

package com.springinaction.test;

import org.springframework.stereotype.Component;

@Component
public class SgtPeppers implements CompactDisc{

private String title = "Sgt. Pepper's Linel Hearts Cloub Band";
private String artist = "The Beatles";

@Override
public void play() {
System.out.println("Playing " + title + " by " + artist);
}

}

3.配置类（注解组件扫描）：@ComponentScan注解，这个注解能够在Spring中启动组件扫描，默认会扫描与配置类相同的包

package com.springinaction.test;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan
public class CDPlayerConfig {

}

4.测试类

package com.springinaction.test;

import static org.junit.Assert.*;

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

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes=CDPlayerConfig.class)
//@ContextConfiguration(locations={"classpath:NewFile.xml"})这里是xml启动组件扫描，因为我们用的是注解扫描，所以注释
public class CDPlayerTest {

@Autowired
private CompactDisc cd;

@Test
public void cdShouldNotbeNull(){
assertNotNull(cd);
}
}

原因是缺少Spring的jar包，在http://repo.spring.io/release/org/springframework/spring

中下载了spring-framework-4.2.0.RELEASE-dist.zip，解压完后把包都导了进入，就ok了