Spring框架-使用P命名空间进行注入

package dao;

import entity.User;

/**
 * 增加DAO接口,定义了所需的持久化方法
 */
public interface UserDao {
    public void save(User user);
}

 1 package dao.impl;
 2 
 3 import dao.UserDao;
 4 import entity.User;
 5 
 6 /**
 7  * 用户DAO类，实现IDao接口，负责User类的持久化操作
 8  */
 9 public class UserDaoImpl implements UserDao {
10 
11     public void save(User user) {
12         // 这里并未实现完整的数据库操作，仅为说明问题
13         System.out.println("保存用户信息到数据库");
14     }
15 }

 1 package service;
 2 
 3 import entity.User;
 4 
 5 /**
 6  * 用户业务接口，定义了所需的业务方法
 7  */
 8 public interface UserService {
 9     public void addNewUser(User user);
10 }

 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 
15     
16 
17     // 生成无参构造方法
18     public UserServiceImpl() {
19 
20     }
21 
22     // 带参数构造方法   为dao进行赋值
23     public UserServiceImpl(UserDao dao) {
24         this.dao = dao;
25     }
26 
27 
28     public UserDao getDao() {
29         return dao;
30     }
31 
32     // dao 属性的setter访问器，会被Spring调用，实现设值注入
33     public void setDao(UserDao dao) {
34         this.dao = dao;
35     }
36 
37     public void addNewUser(User user) {
38         // 调用用户DAO的方法保存用户信息
39         dao.save(user);
40         System.out.println("注入进去的user对象的信息是："+user.toString());
41     }
42 }

 1 package entity;
 2 
 3 /**
 4  * 用户实体类
 5  */
 6 public class User implements java.io.Serializable {
 7     private Integer id; // 用户ID
 8     private String username; // 用户名
 9     private String password; // 密码
10     private String email; // 电子邮件
11     private int age;//年龄
12     
13 
14     @Override
15     public String toString() {
16         return "User [id=" + id + ", username=" + username + ", password="
17                 + password + ", email=" + email + ", age=" + age
18                 + ", getAge()=" + getAge() + ", getId()=" + getId()
19                 + ", getUsername()=" + getUsername() + ", getPassword()="
20                 + getPassword() + ", getEmail()=" + getEmail()
21                 + ", getClass()=" + getClass() + ", hashCode()=" + hashCode()
22                 + ", toString()=" + super.toString() + "]";
23     }
24 
25     public int getAge() {
26         return age;
27     }
28 
29     public void setAge(int age) {
30         this.age = age;
31     }
32 
33     // getter & setter
34     public Integer getId() {
35         return id;
36     }
37 
38     public void setId(Integer id) {
39         this.id = id;
40     }
41 
42     public String getUsername() {
43         return username;
44     }
45 
46     public void setUsername(String username) {
47         this.username = username;
48     }
49 
50     public String getPassword() {
51         return password;
52     }
53 
54     public void setPassword(String password) {
55         this.password = password;
56     }
57 
58     public String getEmail() {
59         return email;
60     }
61 
62     public void setEmail(String email) {
63         this.email = email;
64     }
65 
66 }

 1 package test;
 2 
 3 import org.junit.Test;
 4 import org.springframework.context.ApplicationContext;
 5 import org.springframework.context.support.ClassPathXmlApplicationContext;
 6 
 7 import service.UserService;
 8 import service.impl.UserServiceImpl;
 9 
10 import entity.User;
11 
12 
13 public class AopTest {
14 
15     @Test
16     public void aopTest() {
17         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
18         UserService service = (UserService) ctx.getBean("userService");
19         User user = (User) ctx.getBean("user");
20         service.addNewUser(user);
21     }
22 
23 }