spring's management of beans

catalogue

spring's management of beans

1. How to create bean s

(1) Use default constructor

(2) The set method is injected, and the transfer collection (dynamically creating the factory method and indirectly calling userserviceimpl4) is managed by bean.

(3) The set method is injected, and the transfer collection (the factory method is created statically and calls userserviceimpl4 indirectly) is managed through bean s.

2. Scope and life cycle of bean object

1. How to create bean s

(1) Use default constructor

(2) The set method is injected, and the transfer collection (dynamically creating the factory method and indirectly calling userserviceimpl4) is managed by bean.

main method

	public static void main(String[] args) {
		// 1. Get the core container object
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

		//4.set method injection and transfer collection (dynamically create factory method and indirectly call userserviceimpl4)
		IUserService service5 = (IUserService) context.getBean("userService5");
		service5.queryUser();
		// 3. Close the container (if you don't remember to close the container, the most typical problem is that the database connection cannot be released)
		((ClassPathXmlApplicationContext) context).close();

	}

applicationContext.xml main configuration file  

<bean id="myFactory"
		class="com.iflytek.bookmanagesystem.verbFactory">
	</bean>
	<bean id="userService5" factory-bean="myFactory"
		factory-method="createIUserService">
		<property name="strings">
			<array>
				<value>verb Rush</value>
				<value>verb Roll, roll</value>
				<value>verbFactoty in fact</value>
			</array>
		</property>
	</bean>

(3) The set method is injected, and the transfer collection (the factory method is created statically and calls userserviceimpl4 indirectly) is managed through bean s.

main method

	public static void main(String[] args) {
		// 1. Get the core container object
		ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

		//5.set method injection and transfer collection (create factory method statically and directly call userserviceimpl4)
		IUserService service6 = (IUserService) context.getBean("userService6");
		service6.queryUser();
		// 3. Close the container (if you don't remember to close the container, the most typical problem is that the database connection cannot be released)
		((ClassPathXmlApplicationContext) context).close();

	}

applicationContext.xml main configuration file  

<bean id="userService6"
		class="com.iflytek.bookmanagesystem.staticFactory"
		factory-method="createIUserService">
		<property name="strings">
			<array>
				<value> static Rush</value>
				<value> static Operation room</value>
				<value> staticFactoty Fang Gang</value>
			</array>
		</property>
	</bean>

UserServiceImpl4 code

public class UserServiceImpl4 implements IUserService{

	private String[] strings;
	private List<String> list;
	private Set<String> set;
	private Map< String, String> map;
	private Properties properties;
	
	public void setStrings(String[] strings) {
		this.strings = strings;
	}

	public void setList(List<String> list) {
		this.list = list;
	}

	public void setSet(Set<String> set) {
		this.set = set;
	}

	public void setMap(Map<String, String> map) {
		this.map = map;
	}

	public void setProperties(Properties properties) {
		this.properties = properties;
	}

	public String[] getStrings() {
		return strings;
	}

	public List<String> getList() {
		return list;
	}

	public Set<String> getSet() {
		return set;
	}

	public Map<String, String> getMap() {
		return map;
	}

	public Properties getProperties() {
		return properties;
	}



	@Override
	public String toString() {
		return "UserServiceImpl4 [strings=" + Arrays.toString(strings) + ", list=" + list + ", set=" + set + ", map="
				+ map + ", properties=" + properties + "]";
	}

	@Override
	public String queryUser() {
	  System.out.println(Arrays.toString(strings));
	  System.out.println(list);
	  System.out.println(set);
	  System.out.println(map);
	  System.out.println(properties);
		return "";
	}
	


	
}