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一般情况下，我们会在xml文件定义bean和component，spring有了自动扫描可以不用再xml文件中写bean和component。

    下面，我通过一个简单实例来演示。

用xml文件的方法：

   CustomerDao.java

package com.lzyer.springel.dao;import org.springframework.stereotype.Component;public class CustomerDao {	@Override	public String toString() {				return "This is Customer Dao";	}	}

package com.lzyer.springel.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import com.lzyer.springel.dao.CustomerDao;public class CustomerService {		private CustomerDao customerDao;	public CustomerDao getCustomerDao() {		return customerDao;	}	public void setCustomerDao(CustomerDao customerDao) {		this.customerDao = customerDao;	}	@Override	public String toString() {		return "CustomerService [customerDao=" + customerDao + "]";	}	}

CustomerDao.java

package com.lzyer.springel.dao;import org.springframework.stereotype.Component;@Componentpublic class CustomerDao {	@Override	public String toString() {				return "This is Customer Dao";	}	}

package com.lzyer.springel.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import com.lzyer.springel.dao.CustomerDao;@Componentpublic class CustomerService {	@Autowired	private CustomerDao customerDao;	public CustomerDao getCustomerDao() {		return customerDao;	}	public void setCustomerDao(CustomerDao customerDao) {		this.customerDao = customerDao;	}	@Override	public String toString() {		return "CustomerService [customerDao=" + customerDao + "]";	}	}

package com.lzyer.springel;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.lzyer.springel.service.CustomerService;public class ServiceAndDaoTest {	public static void main(String[] args) {				ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"bean.xml"});				CustomerService cs = (CustomerService)context.getBean("customerService");				System.out.println(cs);	}}

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