java Bean范围（单例，会话，请求，原型）

Posted 2021-05-08

<!-- using prototype scope in xml -->
<!-- everytime the object will be different -->

<?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 name="myCustomerRepository"
		class="com.pluralsight.repository.HibernateCustomerRepositoryImpl" />
	<bean name="customerService" class="com.pluralsight.service.CustomerServiceImpl" autowire="byName" scope="prototype">
		<!-- <property name="customerRepository" ref="myCustomerRepository" /> -->
		<!-- <constructor-arg index="0" ref="myCustomerRepository"></constructor-arg> -->
	</bean>


</beans>

// Can use @Scope("singleton") or using the configuratbleBeanFactory

package com.pluralsight.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;

import com.pluralsight.model.Customer;
import com.pluralsight.repository.CustomerRepository;

@Service("customerService")
@Scope("singleton")
//@Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
public class CustomerServiceImpl implements CustomerService {
	
	private CustomerRepository customerRepository;
	
	/* (non-Javadoc)
	 * @see com.pluralsight.service.CustomerService#findAll()
	 */
	
	public CustomerServiceImpl(){
		
	}
	
	public CustomerServiceImpl(CustomerRepository repo){
		System.out.println("Constructor injection");
		this.customerRepository = repo;
	}
	
	@Override
	public List<Customer> findAll(){
		return customerRepository.findAll();
	}

	@Autowired
	public void setCustomerRepository(CustomerRepository customerRepository) {
		System.out.println("Setter injection");
		this.customerRepository = customerRepository;
	}
	
	
}