輸出Hello World！

1.我們首先要創(chuàng)建一個動態(tài)Web項目，配置Tomcat，并且導(dǎo)入jar包建立path

目錄結(jié)構(gòu)：

image

2.創(chuàng)建Dao包，在Dao包下創(chuàng)建接口TestDao

package dao;

public interface TestDao {
    public void sayHello();
}

3.在Dao下，創(chuàng)建TestDao接口的實現(xiàn)類TestDaoImpl

package dao;

public class TestDaoImpl implements TestDao {

    @Override
    public void sayHello() {
        // TODO Auto-generated method stub
        System.out.println("Hello World！");
    }
}

4.創(chuàng)建配置文件applicationContext.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.xsd">
    <!-- 將指定類TestDaoImpl配置給Spring，讓Spring創(chuàng)建其實例 -->
    <bean id="test" class="dao.TestDaoImpl" />
</beans>

5.創(chuàng)建測試類test.java

package test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import dao.TestDao;

public class Test {
    public static void main(String[] args) {
        // 初始化Spring容器ApplicationContext，加載配置文件
        ApplicationContext appCon = new ClassPathXmlApplicationContext("applicationContext.xml");
        TestDao tt = (TestDao) appCon.getBean("test");// test為配置文件中的id
        tt.sayHello();
    }
}

6.最后運行項目（Run As Java Application），在命令臺中輸出Hello World！

image