校园商铺-2项目设计和框架搭建-9验证Service

1. 新建接口

main: com.csj2018.o2o.service/AreaService.java

package com.csj2018.o2o.service;

import java.util.List;

import com.csj2018.o2o.entity.Area;

public interface AreaService {

	List<Area> getAreaList();

}

2. 新建实现类

main: com.csj2018.o2o.service.impl/AreaServiceImpl.java

package com.csj2018.o2o.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.csj2018.o2o.dao.AreaDao;

import com.csj2018.o2o.entity.Area;

import com.csj2018.o2o.service.AreaService;

@Service

public class AreaServiceImpl implements AreaService{

	@Autowired

	private AreaDao areaDao;

	@Override

	public List<Area> getAreaList(){

		return areaDao.queryArea();

	}

}

3. 修改基类

test: com.csj2018.o2o/BaseTest.java

package com.csj2018.o2o;

import org.junit.runner.RunWith;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**

 * 配置spring和junit整合，junit启动式加载springIOC容器

 */

@RunWith(SpringJUnit4ClassRunner.class)

//告诉junit spring配置文件的位置

@ContextConfiguration({"classpath:spring/spring-dao.xml","classpath:spring/spring-service.xml"})

public class BaseTest {

}

4. 测试类

test: com.csj2018.o2o.service/AreaServiceTest.java

package com.csj2018.o2o.service;

import static org.junit.Assert.assertEquals;

import java.util.List;

import org.junit.Test;

import org.springframework.beans.factory.annotation.Autowired;

import com.csj2018.o2o.BaseTest;

import com.csj2018.o2o.entity.Area;

public class AreaServiceTest extends BaseTest{

	@Autowired

	private AreaService areaService;

	@Test

	public void testGetAreaList() {

		List<Area> areaList = areaService.getAreaList();

		assertEquals("南苑",areaList.get(0).getAreaName());

	}

}

## 问题：
### 1.AreaServiceTest运行错误
```#log
九月 21, 2019 6:21:41 下午 org.springframework.test.context.TestContextManager prepareTestInstance
严重: Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@2d554825] to prepare test instance [com.csj2018.o2o.service.AreaServiceTest@26abb146]
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'com.csj2018.o2o.service.AreaServiceTest': Unsatisfied dependency expressed through field 'areaService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.csj2018.o2o.service.AreaService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
...
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.csj2018.o2o.service.AreaService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1486)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
...
```

原因：
1. spring-service.xml文件配置错误，修正即可
2. AreaServiceImpl.java是否缺少注释，如Controller注解