实例详解Spring 两种注入的方式（Set和构造）

package com.xiami.spring;

public class HelloWorld {

	private String str;

	/**
	 * 默认构造方法
	 */
	public HelloWorld() {
	}

	/**
	 * 用来进行构造注入的构造方法
	 * 
	 * @param str
	 */
	public HelloWorld(String str) {
		this.str = str;
	}

	/**
	 * 用来进行Set注入的方法
	 * @param str
	 */
	public void setStr(String str) {
		this.str = str;
	}

	/**
	 * 输出字符串的方法
	 */
	public void sayHello() {
		System.out.println(str);
	}
}

package com.xiami.spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//载入spring配置文件
		BeanFactory bFactory = new XmlBeanFactory(new ClassPathResource("applicationContext.xml"));
		HelloWorld helloWorld = (HelloWorld) bFactory.getBean("helloService");
		helloWorld.sayHello();
	}

}

<?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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	
	<!-- 使用Set方式注入 -->
	<!-- 
	<span style="color:#ff0000;"><bean id="helloService" class="com.xiami.spring.HelloWorld"
		abstract="false" lazy-init="default" autowire="default">
		<property name="str">
			<value type="java.lang.String">hello world</value>
		</property>
	</bean></span>
	 -->
	 
	 <!-- 使用构造方法方式注入 
	 <bean id="helloService" class="com.xiami.spring.HelloWorld"
	 	abstract="false" lazy-init="default" autowire="default">
	 	<constructor-arg>
	 		<value type="java.lang.String">构造方法注入方式</value>
	 	</constructor-arg>
	 </bean>
	 -->
	 
	 </beans>