04_Spring Bean 别名 name alias 常量注入、bean注入、数组注入，List注入、Map注入、set注入、null注入、Properties注入 p空间注入、c空间注入

刺骨的言语ヽ痛彻心扉 2022-12-29 06:41 112阅读 0赞

## Spring bean 别名 name alias ##

user类

public class User { 
    	private String name;
    	
    	public User(String name) { 
    		this.name = name;
    	}
    	public String getName() { 
    		return name;
    	}
    	public void setName(String name) { 
    		this.name = name;
    	}		
    }

xml

<?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.xsd">
       
       <bean id="user" name="u1,u2" class="cn.lingyiwin.bean.User">
       		<constructor-arg index="0" value="创建bean实例"/>
       </bean>
       <alias name="user" alias="a1"/>
       <alias name="user" alias="a2"/>
    </beans>

TestUser 类

public class TestUser { 
    	public static void main(String[] args) { 
    		ApplicationContext act =new ClassPathXmlApplicationContext("config/spring.xml");
    		User user = (User)act.getBean("user");
    		System.out.println(user.getName());
    		User a1 = (User)act.getBean("a1");
    		System.out.println(a1.getName());
    		User a2 = (User)act.getBean("a2");
    		System.out.println(a2.getName());
    		User u1 = (User)act.getBean("u1");
    		System.out.println(u1.getName());
    		User u2 = (User)act.getBean("u2");
    		System.out.println(u2.getName());
    	}
    }

执行结果：

创建bean实例
    创建bean实例
    创建bean实例
    创建bean实例
    创建bean实例

总结：  
alias 标签只能起一个别名  
bean 标签中的name属性可以起多个别名

## 常量注入、bean注入、数组注入，List注入、Map注入、set注入、null注入、Properties注入 ##

Address 类

public class Address { 
    	private String address;
    
    	public String getAddress() { 
    		return address;
    	}
    
    	public void setAddress(String address) { 
    		this.address = address;
    	}
    }

Student 类

public class Student { 
    	private String name;
    	private Address addr;
    	private String[] books;
    	private List<String> hobbies;
    	private Map<String,String> cards;
    	private Set<String> games;
    	private String wife;
    	private Properties info;
    	public void setName(String name) { 
    		this.name = name;
    	}
    	public void setAddr(Address addr) { 
    		this.addr = addr;
    	}
    	public void setBooks(String[] books) { 
    		this.books = books;
    	}
    	public void setHobbies(List<String> hobbies) { 
    		this.hobbies = hobbies;
    	}
    	public void setCards(Map<String, String> card) { 
    		this.cards = card;
    	}
    	public void setGames(Set<String> games) { 
    		this.games = games;
    	}
    	public void setWife(String wife) { 
    		this.wife = wife;
    	}
    	public void setInfo(Properties info) { 
    		this.info = info;
    	}
    	public void show(){ 
    		System.out.println("name="+name+" addr="+addr.getAddress());
    		System.out.println("books=");
    		for(int i=0;i<books.length;i++){ 
    			System.out.print(books[i]+" ");
    		}
    		System.out.println();
    		System.out.println("hobbies="+hobbies);
    		System.out.println("cards="+cards);
    		System.out.println("games="+games);
    		System.out.println("wife="+wife);
    		System.out.println("info="+info);
    	}
    }

xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
            
       	<bean id="addr" class="cn.lingyiwin.bean.Address">
         	<property name="address" value="北京西三旗"/>
         </bean>
    	  <bean id="student" class="cn.lingyiwin.bean.Student">
    	  
    	  	<property name="name" value="张三丰"/>
    	  	 
    	  	<property name="addr" ref="addr"/>
    	  	
    	  	<property name="books">
    	  		<array>
    	  			<value>傲慢与偏见</value>
    	  			<value>仲夏夜之梦</value>
    	  			<value>雾都孤儿</value>
    	  		</array>
    	  	</property>
    	  	
    	  	<property name="hobbies">
    	  		<list>
    	  			<value>羽毛球</value>
    	  			<value>乒乓球</value>
    	  			<value>玻璃球</value>
    	  			<value>台球球</value>
    	  		</list>
    	  	</property>
    	  	
    	  	<property name="cards">
    	  		<map>
    	  			<entry key="中国银行" value="149127348932174"/>
    	  			<entry>
    	  				<key><value>建设银行</value></key>
    	  				<value>622710023478234234</value>
    	  			</entry>
    	  		</map>
    	  	</property>
    	  	
    	  	<property name="games">
    	  		<set>
    	  			<value>lol</value>
    	  			<value>dota</value>
    	  			<value>cs1.6</value>
    	  			<value>dnf</value>
    	  		</set>
    	  	</property>
    		
    	  	<property name="wife"><null/></property>
    	  	
    	  	<property name="info">
    	  		<props>
    	  			<prop key="学号">2015052601</prop>
    	  			<prop key="sex">男</prop>
    	  			<prop key="name">小明</prop>
    	  		</props>
    	  	</property>
    	  </bean>  
    </beans>

TestStudent 类

public class TestStudent { 
    	public static void main(String[] args) { 
    		ApplicationContext act= new ClassPathXmlApplicationContext("/config/spring.xml");
    		Student st=(Student)act.getBean("student");
    		st.show();
    	}
    }

执行结果：

name=张三丰  addr=北京西三旗
    books=
    傲慢与偏见  仲夏夜之梦  雾都孤儿  
    hobbies=[羽毛球, 乒乓球, 玻璃球, 台球球]
    cards={ 中国银行=149127348932174, 建设银行=622710023478234234}
    games=[lol, dota, cs1.6, dnf]
    wife=null
    info={ 学号=2015052601, name=小明, sex=男}

## p空间注入、c空间注入 ##

*  xmlns:p="http://www.springframework.org/schema/p
 *  xmlns:c=“http://www.springframework.org/schema/c”
 *  p命名空间注入 属性依然要设置set方法
 *  c命名空间注入要求有对应参数的构造方法  
    xml