Spring 使用注解存储和读取 Bean对象操作方法

@Controller
public class StudentController1 {
    public void sayHi(){
        System.out.println("do studentController1 sayHi().");
    }
}

public static void main(String[] args) {
    ApplicationContext context =
            new ClassPathXmlApplicationContext("spring-config.xml");
    StudentController1 studentController1 =
            context.getBean("studentController1", StudentController1.class);
    studentController1.sayHi();
}

@Service
public class StudentController2 {
    public void sayHi(){
        System.out.println("do studentController2 sayHi().");
    }
}

StudentController2 studentController2 =
        context.getBean("studentController2", StudentController2.class);

@Repository
public class StudentController3 {
    public void sayHi(){
        System.out.println("do studentController3 sayHi().");
    }
}

StudentController3 studentController3 =
        context.getBean("studentController3", StudentController3.class);

@Component
public class StudentController4 {
    public void sayHi(){
        System.out.println("do studentController4 sayHi().");
    }
}

StudentController4 studentController4 =
        context.getBean("studentController4", StudentController4.class);

@Configuration
public class StudentController5 {
    public void sayHi(){
        System.out.println("do studentController5 sayHi().");
    }
}

StudentController5 studentController5 =
        context.getBean("studentController5", StudentController5.class);

SController sController = context.getBean("sController", SController.class);

package com.spring.demo.entity;
/**
 * 普通的用户实体类
 */
public class User {
    private Integer uid;
    private String username;
    private String password;
    private Integer age;
    public Integer getUid() {
        return uid;
    }
    public void setUid(Integer uid) {
        this.uid = uid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "User{" +
                "uid=" + uid +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                '}';
    }
}

@Controller
public class UserBeans {
    @Bean
    public User getUser(){
        User user = new User();
        user.setUid(1);
        user.setUsername("王五");
        user.setPassword("123456");
        user.setAge(18);
        return user;
    }
}

public static void main(String[] args) {
    ApplicationContext context =
            new ClassPathXmlApplicationContext("spring-config.xml");
    User user = context.getBean("getUser", User.class);
    System.out.println(user);
}

@Service
public class UserService {
    public void sayHi(){
        System.out.println("hi, userService.");
    }
}

@Controller
public class UserController {
    // 1. 属性注入
    @Autowired
    private UserService userService;
    public void sayHi(){
        System.out.println("do userController sayHi().");
        userService.sayHi();
    }
}

@Controller
public class UserController {
    // 2. setter 注入
    private UserService userService;
    @Autowired
    public void setUserService(UserService userService) {
        this.userService = userService;
    }
    public void sayHi(){
        System.out.println("do userController sayHi().");
        userService.sayHi();
    }
}

@Controller
public class UserController {
    // 3. 构造方法注入
    private UserService userService;
    // @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }
    public void sayHi(){
        System.out.println("do userController sayHi().");
        userService.sayHi();
    }
}

public class UserController {
    // 1. 属性注入
    @Resource
    private UserService userService;
    public void sayHi(){
        System.out.println("do userController sayHi().");
        userService.sayHi();
    }
}

@Controller
public class UserController {
    // 2. setter 注入
    private UserService userService;
    @Resource
    public void setUserService(UserService userService) {
        this.userService = userService;
    }
    public void sayHi(){
        System.out.println("do userController sayHi().");
        userService.sayHi();
    }
}

@Controller
public class UserBeans {
    @Bean(name = {"user1", "u1"})
    public User getUser1(){
        User user = new User();
        user.setUid(1);
        user.setUsername("张三");
        user.setPassword("123456");
        user.setAge(18);
        return user;
    }
    @Bean(name = "user2")
    public User getUser2(){
        User user = new User();
        user.setUid(1);
        user.setUsername("李四");
        user.setPassword("123456");
        user.setAge(18);
        return user;
    }
}

@Controller
public class UserController {
    @Resource(name = "user1")
    private User user;
    public void sayHi(){
        System.out.println("do userController sayHi().");
    }
}

@Controller
public class UserController {
    @Autowired
    @Qualifier(value = "user1")
    private User user;
    public void sayHi() {
        System.out.println("do userController sayHi().");
    }
}