Spring框架-构造注入的属性问题-type属性

 1 package service.impl;
 2 
 3 import service.UserService;
 4 import dao.UserDao;
 5 import entity.User;
 6 
 7 /**
 8  * 用户业务类，实现对User功能的业务管理
 9  */
10 public class UserServiceImpl implements UserService {
11 
12     // 声明接口类型的引用，和具体实现类解耦合
13     private UserDao dao;
14     private String s1;
15     private String s2;
16     private int i1;
17     
18 
19     // 生成无参构造方法
20     public UserServiceImpl() {
21 
22     }
23 
24     // 带参数构造方法   为dao进行赋值
25     public UserServiceImpl(UserDao dao) {
26         this.dao = dao;
27     }
28     public UserServiceImpl(UserDao dao,String s1) {
29         this.dao = dao;
30         this.s1=s1;
31     }
32     public UserServiceImpl(String s2,UserDao dao) {
33         this.dao = dao;
34         this.s2=s2;
35     }
36     public UserServiceImpl(int i1,UserDao dao) {
37         this.dao = dao;
38         this.i1=i1;
39     }
40 
41 
42     public UserDao getDao() {
43         return dao;
44     }
45 
46     // dao 属性的setter访问器，会被Spring调用，实现设值注入
47     public void setDao(UserDao dao) {
48         this.dao = dao;
49     }
50 
51     public void addNewUser(User user) {
52         // 调用用户DAO的方法保存用户信息
53         dao.save(user);
54         System.out.println("s1="+s1);
55         System.out.println("s2="+s2);
56         System.out.println("i1="+i1);
57     }
58 }