1. 需要在applicationContext.xml 启动注解注入的方式，添加配置选项，如下：
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xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">
?完整的applicationContext.xml：
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/
beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config/> <!-- 定义使用注解注入 -->
<context:component-scan base-package="com.spring"/><!--自动搜索自定包下的类进行注解注入-->
</beans>
2. 对类进行注解注入
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?? 如何对需要注解的类进行标识，分为两种方法：
?? (1). 通用方法：
?? @Component("别名")?
?? @Scope("prototype")??? //多例(默认是单例)
?? 通用方法对所有的类都可用，如action,service,dao，但是不推荐使用，因在这样不好区分，代码可读性不好。
?? (2).特殊类注解(这种方法是spring推荐的)
?? action??类:???? @Controller("别名")
?? service 类:??? @Service("别名")
?? dao????? 类:??? @Repository("别名")
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3. 实例代码
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?? UserAction：
package com.spring.action;
import javax.annotation.Resource;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import com.spring.dao.UserDao;
import com.spring.service.UserService;
@Controller("userAction")
@Scope("prototype") //多例模式
public class UserAction {
@Resource(name="userService") //通过注解得到UserService对象
private UserService us;
@Resource(name="UserDao") //通过注解得到UserDao对象
private UserDao dao;
public void run(){
System.out.println("UserAction running......");
us.runService();
dao.addUser("admin");
}
}
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? UserService:
package com.spring.service;
import org.springframework.stereotype.Service;
@Service("userService")
public class UserService {
public void runService(){
System.out.println("user service running......");
}
}
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UserDao:
package com.spring.dao;
import org.springframework.stereotype.Repository;
@Repository("UserDao")
public class UserDao {
public void addUser(String username){
System.out.println(username+"添加成功");
}
}
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