运用Spring的XML装配Bean的简单案例

基于XML装配Bean有两种方式：设值注入和构造器注入

运行结果：

User类

package com.itheima.assemble;

import java.util.List;

public class User {
	
	private String  userName;
	private Integer password;
	private List<String> list;
	
	/*
	 * 使用构造器注入
	 * 提供带所有参数的构造方法
	 */
	public User(String userName, Integer password, List<String> list) {
		super();
		this.userName = userName;
		this.password = password;
		this.list = list;
	}
	
	
	/*
	 * 使用设值注入
	 * 提供默认空参构造方法
	 * 为所有属性提供setter方法
	 */
	

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public void setPassword(Integer password) {
		this.password = password;
	}

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


	public User() {
		super();
	}
	@Override
	public String toString() {
		return "User [userName=" + userName + ", password=" + password + ", list=" + list + "]";
	}

	

	
	
	
}

 配置文件beans5.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-4.3.xsd">
   <!-- 使用构造注入方式装配User实例 -->
   <bean id="user1" class="com.itheima.assemble.User">
   		<constructor-arg index="0" value="tom" />
   		<constructor-arg index="1" value="123456" />
   		<constructor-arg index="2" >
   			<list>
   				<value>constructorvalue1</value>
   				<value>constructorvalue2</value>
   			</list>
   		</constructor-arg>
   </bean>
   <!-- 使用setter方式装配User实例 -->
   <bean id="user2" class="com.itheima.assemble.User">
   		<property name="userName" value="张三"></property>
   		<property name="password" value="111111"></property>
   		<property name="list">
   			<list>
   				<value>"setlistvalue1"</value>
   				<value>"setlistvalue2"</value>
   			</list>
   		</property>
   </bean>
</beans>

测试类

package com.itheima.assemble;

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

public class XmlBeanAssembleTest {

	public static void main(String[] args) {
//		定义配置文件的路径
		String xmlPath = "com/itheima/assemble/beans5.xml";

		ApplicationContext applicationContext = new 
				ClassPathXmlApplicationContext(xmlPath);
                   
		//构造器方式输出
		System.out.println(applicationContext.getBean("user1"));
                //设值方式输出
		System.out.println(applicationContext.getBean("user2"));

	}

}