spring入門

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"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
 
     <!-- IOC容器的配置，要創建的所有的對象都配置在這裏 -->
     
     <!-- 默認無參數 -->
     <bean id = "admin1" class="erchou.Admin" scope="singleton"></bean>
     
     <!-- 帶參數構造器 -->
     <bean id = "admin2" class="erchou.Admin" scope="singleton">
           <constructor-arg value="1"></constructor-arg>
           <constructor-arg value="jack"></constructor-arg>
           <constructor-arg value="123456"></constructor-arg>
     </bean>
     <!-- 工廠創建對象方法 -->
     <!-- 調用實例方法   :1.先創建工廠 2.創建對象-->
     <bean id = "factroy" class="erchou.ObjectFactoty"></bean>
     <bean id = "admin3" factory-bean="factroy" factory-method="getAdmin"></bean>
     
     
     <!-- 靜態方法 -->
     <bean id = "admin4" class="erchou.ObjectFactoty" factory-method="getStaticAdmin"></bean>
</beans>

java主要代碼：

  

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App_2 {
	/***
	   * 
	   * 對象創建：
	   * 單例或者多例
	   * 單例：scope = "singleton" 默認是單例
	   * 多例：scope = "prototype" 
	   */
  private static ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("erchou/bean.xml");

  public static void main(String[] args) {
	  Admin admin1 = (Admin)ac.getBean("admin1");
	  System.out.println(admin1);
	  
	  Admin admin2 = (Admin)ac.getBean("admin2");
	  System.out.println(admin2);
	  
	  Admin admin3 = (Admin)ac.getBean("admin3");
	  System.out.println(admin3);
	  
	  Admin admin4 = (Admin)ac.getBean("admin4");
	  System.out.println(admin4);
	  
}  
}