注解 @Autowired @Qualifer @Resource 的区别

 1 package com.yzc.springMVC.service;
 2 
 3 /**
 4  * 
 5  * @Title: AutowiredController.java
 6  * @Package: com.yzc.springMVC
 7  * @Description: 描述该文件做什么
 8  * @author yangzhancheng
 9  * @2020年4月19日:下午10:39:55
10  *
11  */
12 
13 public interface IAutowiredService {
14     
15     String action();
16 }

 1 package com.yzc.springMVC.service;
 2 
 3 import org.springframework.stereotype.Service;
 4 
 5 /**
 6  * 
 7  * @Title: AutowiredServiceOne.java
 8  * @Package: com.yzc.springMVC.service
 9  * @Description: 按类型进行注解
10  * @author yangzhancheng
11  * @2020年4月19日:下午10:56:42
12  *
13  */
14 @Service
15 public class AutowiredServiceTYPE implements IAutowiredService{
16     
17     public String action(){
18         String msg = "AutowiredServiceTYPE：是按类型。";
19         return msg;
20     }
21 }

 1 package com.yzc.springMVC.controller;
 2 
 3 
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.RequestMapping;
 7 import org.springframework.web.bind.annotation.ResponseBody;
 8 
 9 import com.yzc.springMVC.service.IAutowiredService;
10 
11 
12 /**
13  * 
14  * @Title: AutowiredController.java
15  * @Package: com.yzc.springMVC
16  * @Description: 描述该文件做什么
17  * @author yangzhancheng
18  * @2020年4月19日:下午10:39:55
19  *
20  */
21 @Controller
22 @RequestMapping(value = "/autowired")
23 public class AutowiredController {
24 
25     /**
26      * 通过类自动匹配
27      */
28     @Autowired
29     private IAutowiredService autowiredService;
30     
31     @RequestMapping(value = "/action",produces = "application/json;charset=UTF-8")
32     @ResponseBody
33     public String action(){
34         String msg = autowiredService.action();
35         System.out.print(msg);
36         return msg;
37     }
38     
39     
40 }