Spring学习一：FirstDemo

最新推荐文章于 2026-01-05 13:24:23 发布

最新推荐文章于 2026-01-05 13:24:23 发布 · 215 阅读

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#Spring #Bean #log4j #Myeclipse #Apache

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本文详细介绍如何使用Spring框架创建简单的Java应用程序。从项目搭建到配置文件编写，再到Bean的定义及依赖注入，最后通过实例演示了如何运行程序并展示结果。

IDE：MyEclipse 8.6，JRE1.6

一、新建一个Java Project，Project name：SpringStudy。然后右键选择MyEclipse->Add Spring Capabilities

二、在src目录下添加Log4j配置文件log4j.properties，参考配置如下：

log4j.rootLogger=WARN, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

如未添加会出现如下警告：WARN Please initialize the log4j system properly

三、编写第一个组件HelloBean：

package com.lifeng.spring.firstdemo.bean;

import java.util.Date;

public class HelloBean {
	private String helloWord;
	private Date date;

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public String getHelloWord() {
		return helloWord;
	}

	public void setHelloWord(String helloWord) {
		this.helloWord = helloWord;
	}
	
}

再添加另一个Bean（该Bean为演示通过构造函数注入）

package com.lifeng.spring.firstdemo.bean;

public class HelloBean2 {
	public HelloBean2(String name, String helloWord){
		this.helloWord = helloWord;
		this.name = name;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getHelloWord() {
		return helloWord;
	}
	public void setHelloWord(String helloWord) {
		this.helloWord = helloWord;
	}
	String name;
	String helloWord;
}

新建Config目录并添加配置文件firstDemo.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"
	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">

	<bean id = "hellobean" class = "com.lifeng.spring.firstdemo.bean.HelloBean">
		<property name="helloWord">
			<value>hello! first demo </value>	
		</property>
		<property name="date">
			<!-- 引用其他bean -->
			<ref bean = "dateBean"/>
		</property>
	</bean>
	
	<bean id = "dateBean" class = "java.util.Date">	</bean>
	
	<bean id = "hellobean2" class = "com.lifeng.spring.firstdemo.bean.HelloBean2">
		<!-- 通过构造函数注入bean -->
		<constructor-arg index = "0">
			<value>TT</value>
		</constructor-arg>
		<constructor-arg index = "1">
			<value>hello! </value>
		</constructor-arg>
	</bean>

</beans>

四、FirstDemo的Main

package com.lifeng.spring.firstdemo;

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

import com.lifeng.spring.firstdemo.bean.HelloBean;
import com.lifeng.spring.firstdemo.bean.HelloBean2;



public class FirstDemoMain {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ApplicationContext context = new FileSystemXmlApplicationContext("config/firstDemo.xml");
		HelloBean hello =  (HelloBean) context.getBean("hellobean");
		System.out.println(hello.getHelloWord() + hello.getDate());	
		
		HelloBean2 hello2 =  (HelloBean2) context.getBean("hellobean2");
		System.out.println(hello2.getHelloWord() + hello2.getName());	
	}

}

五、最后目录结构如下

测试结果：