Java 3.Spring Dependency Injection

A, set injection method

 

value: value type injection

ref: the object type injection

 

sing

the Person class {public 
	Private String name; 
	Private Age Integer; 
	Private Car CAR ; 
	public the Person () { 
		Super (); 
		System.out.println ( "constructor calls"); 
	} 
	public void the init () { 
		System.out.println ( "the Person is initialized ..."); 
	} 
	public void the destroy () { 
		System.out.println ( "the Person destroyed ..."); 
	}

 

bean configuration

        <bean name="car" class="com.Spring.pojo.Car">
        <property name="name" value="BWM"></property>
        <property name="color" value="red"></property>
        
        </bean>
        
        <bean name= "person1" class="com.Spring.pojo.Person">
        <property name="name" value="helen"></property>
        <property name="age" value="18"></property>
        <property name="car" ref="car"></property>
        </bean>

 

Second, Constructor injection

There arg constructor of Person 1. Create

 

	the Person public (String name, Car CAR) { 
		Super (); 
		System.out.println ( "construction method called the Person (String name, Car CAR)"); 
		this.name = name; 
		this.car = CAR; 
	}

 

 

Configuring bean

 

        <bean name="person2" class="com.Spring.pojo.Person">
        <constructor-arg name="name" value="988" index="1" type="java.lang.Integer"></constructor-arg>
        <constructor-arg name="car" ref="car" index="0"></constructor-arg>
        </bean>

 

 

 

test

 

	@Test
	@SuppressWarnings("resource")
	public void testConstructer() {  
		
		AbstractApplicationContext context = new ClassPathXmlApplicationContext("applicationContext-injection.xml");		
		Person person2=(Person) context.getBean("person2");
		System.out.println(person2);
	}

 

 

 

2. Using the specified location index parameter

pojo the following two constructors

 

	the Person public ( String name , Car CAR) { 
		Super (); 
		System.out.println ( "construction method called the Person (String name, Car CAR)"); 
		this.name = name; 
		this.car = CAR; 
	} 
	
	public the Person ( Car CAR , Integer name ) { 
		Super (); 
		System.out.println ( "construction method called the Person (Car CAR, int name)"); 
		this.name = name + ""; 
		this.car = CAR; 
	}

Configuring bean

        <bean name="person2" class="com.Spring.pojo.Person">
        <constructor-arg name="name" value="988" index="1" type="java.lang.Integer"></constructor-arg>
        <constructor-arg name="car" ref="car" index="0"></constructor-arg>
        </bean>

 

3. Use the type parameter to specify the type of

	the Person public (String name, Car CAR ) { 
		Super (); 
		System.out.println ( "construction method called the Person (String name, Car CAR)"); 
		this.name = name; 
		this.car = CAR; 
	} 
	
	public the Person (Car CAR, Integer name ) { 
		Super (); 
		System.out.println ( "construction method called the Person (Car CAR, int name)"); 
		this.name = name + ""; 
		this.car = CAR; 
	}

 

bean configuration

        <bean name="person2" class="com.Spring.pojo.Person">
        <constructor-arg name="name" value="988" index="1" type="java.lang.Integer"></constructor-arg>
        <constructor-arg name="car" ref="car" index="0"></constructor-arg>
        </bean>

 

Three, p namespace injection

Import namespace

Typical Case: Configure Data Source

 

Four, spl injection