装配bean的三种方式

叁歲伎倆 2023-10-07 10:03 66阅读 0赞

### 第一种：XML装配 ###

##### xml装配有两种方式： #####

##### 第一种：利用有参构造方法注入 #####

***User类：***

package com.liu.xml;
    
    import java.util.List;
    //xml装配bean的两种方式
    public class User {
        
    	
    	private String username;
    	private Integer password;
    	private List<String> list;
    	
    	//第一种：利用有差构造方法装配bean
    	public User(String username, Integer password, List<String> list) {
        
    		super();
    		this.username = username;
    		this.password = password;
    		this.list = list;
    	}
    	
    	@Override
    	public String toString() {
        
    		return "User [username=" + username + ", password=" + password + ", list=" + list + "]";
    	}
    	
    	
    }

**ApplicationContext.xml配置文件：**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">
    
            
            
            <bean id = "user2" class = "com.liu.xml.User">
            	<constructor-arg index = "0" value = "lisi"></constructor-arg>
            	<constructor-arg index = "1" value = "123456"></constructor-arg>
            	<constructor-arg>
            	
            		<list>
            			<value>listvalue1</value>
            			<value>listvalue1</value>
            			<value>listvalue1</value>
            		</list>
            	</constructor-arg>
            </bean>
            
    </beans>

**测试类：**

package com.liu.xml;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class XmlBeanTest {
        
    	public static void main(String[] args) {
        
    		//获取配置文件路径
    		String xmlpath ="com/liu/xml/ApplicationContext.xml";
    		//加载配置文件
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		//输出有参构造方法注入的结果
    		User user2 = (User) applicationContext.getBean("user2");
    		System.out.println(user2);
    	}
    
    }

##### 第二种：利用无参构造方法和setter方法注入 #####

**User类：**

package com.liu.xml;
    
    import java.util.List;
    //xml装配bean的两种方式
    public class User {
        
    	
    	private String username;
    	private Integer password;
    	private List<String> list;
    	
    	//第二种：无参构造方法和setter方法注入
    	
    	public User() {
        
    		super();
    	}
    	public void setUsername(String username) {
        
    		this.username = username;
    	}
    	public void setPassword(Integer password) {
        
    		this.password = password;
    	}
    	public void setList(List<String> list) {
        
    		this.list = list;
    	}
    	@Override
    	public String toString() {
        
    		return "User [username=" + username + ", password=" + password + ", list=" + list + "]";
    	}
    
    }

**ApplicationContext.xml配置文件：**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">
            
            
    		<bean id = "user1" class = "com.liu.xml.User">
    			<property name="username" value = "zhangsan"></property>
    			<property name="password" value = "123456"></property>
    			<property name="list" >
    			
    				<list>
    					<value>listvalue1</value>
    					<value>listvalue2</value>
    					<value>listvalue3</value>
    				</list>
    			</property>
    		</bean>
            
    </beans>

**测试类：**

package com.liu.xml;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class XmlBeanTest {
        
    	public static void main(String[] args) {
        
    		//获取配置文件路径
    		String xmlpath ="com/liu/xml/ApplicationContext.xml";
    		//加载配置文件
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		//输出无参构造方法注入的结果
    		User user1 = (User) applicationContext.getBean("user1");
    		System.out.println(user1);
    		
    	}
    
    }

**两种方式的输出结果：**

User [username=zhangsan, password=123456, list=[listvalue1, listvalue2, listvalue3]]
    User [username=lisi, password=123456, list=[listvalue1, listvalue1, listvalue1]]

### 第二种：注解装配 ###

**UserDao.java**

package annotation;
    
    public interface UserDao {
        
    	public void save();
    
    }

**UserDaoImpl.java**

package annotation;
    
    import org.springframework.stereotype.Repository;
    
    @Repository("userDao")
    public class UserDaoImpl implements UserDao {
        
    
    	@Override
    	public void save() {
        
    		// TODO Auto-generated method stub
    		System.out.println("UserDao------save");
    	}
    
    }

**UserService.java**

package annotation;
    
    public interface UserService {
        
    	public void save();
    
    }

**UserServiceImpl.java**

package annotation;
    
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    @Service("userService")
    public class UserServiceImpl implements UserService {
        
    
    	//@Resource(name = "userDao")  两种注解都可以  Resource是根据名称注解  Autowired是自动注解
    	@Autowired
    	private UserDao userDao;
    	@Override
    	public void save() {
        
    		// TODO Auto-generated method stub
    		
    		this.userDao.save();
    		System.out.println("UserSerevice-------save");
    	}
    
    }

**UserController.java：**

package annotation;
    
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    
    @Controller("controller")
    public class UserController {
        
    	
    	//@Resource(name = "userService")两种注解都可以  Resource是根据名称注解  Autowired是自动注解
    	@Autowired
    	private UserService userService;
    	public void save() {
        
    		this.userService.save();
    		System.out.println("UserController------save");
    	}
    
    }

**ApplicationContext.xml配置文件**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.3.xsd">
            
            
            
            
            
             <context:annotation-config></context:annotation-config>
             
             
             <bean id = "userDao" class = "annotation.UserDaoImpl"></bean>       
             <bean id = "userService" class = "annotation.UserServiceImpl"></bean> 
             <bean id = "userController" class = "annotation.UserController"> </bean>
             
             
             
             
            
    </beans>

**ControllerTest.java测试类：**

package annotation;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class ControllerTest {
        
    //使用注解进行装配
    	public static void main(String[] args) {
        
    		String xmlpath = "annotation/ApplicationContext.xml";
    		
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		//获取UserController的实例
    		UserController userController = (UserController) applicationContext.getBean("userController");
    		//输出UserController中的save方法
    		userController.save();
    	}
    	
    }

**输出结果：**

UserDao------save
    UserSerevice-------save
    UserController------save

### 第三种：自动装配 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE1MTk2MA_size_16_color_FFFFFF_t_70]  
**UserDao.java：**

package zidongzhuangpei;
    
    public interface UserDao {
        
    	public void save();
    
    }

**UserDaoImpl.java：**

package zidongzhuangpei;
    
    import org.springframework.stereotype.Repository;
    
    @Repository("userDao")
    public class UserDaoImpl implements UserDao {
        
    
    	@Override
    	public void save() {
        
    		// TODO Auto-generated method stub
    		System.out.println("UserDao------save");
    	}
    
    }

**UserService.java：**

package zidongzhuangpei;
    
    public interface UserService {
        
    	public void save();
    
    }

**UserServiceImpl.java：**

package zidongzhuangpei;
    
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    @Service("userService")
    public class UserServiceImpl implements UserService {
        
    
    	//@Resource(name = "userDao")
    	@Autowired
    	private UserDao userDao;
    	
    	public void setUserDao(UserDao userDao) {
        
    		this.userDao = userDao;
    	}
    	
    	
    	@Override
    	public void save() {
        
    		// TODO Auto-generated method stub
    		
    		this.userDao.save();
    		System.out.println("UserSerevice-------save");
    	}
    	
    
    }

**UserController.java：**

package zidongzhuangpei;
    
    import javax.annotation.Resource;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    
    @Controller("controller")
    public class UserController {
        
    	
    	//@Resource(name = "userService")
    	@Autowired
    	private UserService userService;
    	
    	public void setUserService(UserService userService) {
        
    		this.userService = userService;
    	}
    	
    	public void save() {
        
    		this.userService.save();
    		System.out.println("UserController------save");
    	}
    	
    
    }

**ApplicationContext.xml配置文件：**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.3.xsd">
            
         
            
            
            
             <context:annotation-config></context:annotation-config>
             
             
             <bean id = "userDao" class = "zidongzhuangpei.UserDaoImpl"></bean>       
             <bean id = "userService" class = "zidongzhuangpei.UserServiceImpl" autowire="byName"></bean> 
             <bean id = "userController" class = "zidongzhuangpei.UserController" autowire="byName"> </bean>
             
             
             
    </beans>

**ControllerTest.java测试类：**

package zidongzhuangpei;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class ControllerTest {
        
    //使用注解进行装配
    	public static void main(String[] args) {
        
    		String xmlpath = "zidongzhuangpei/ApplicationContext.xml";
    		
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		//获取UserController的实例
    		UserController userController = (UserController) applicationContext.getBean("userController");
    		//输出UserController中的save方法
    		userController.save();
    	}
    	
    }

**运行结果：**

UserDao------save
    UserSerevice-------save
    UserController------save

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE1MTk2MA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200229034706397.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTE1MTk2MA==,size_16,color_FFFFFF,t_70