1.3 Spring入门程序开发

输出Hello World！

1.我们首先要创建一个动态Web项目，配置Tomcat，并且导入jar包建立path

目录结构：

image

2.创建Dao包，在Dao包下创建接口TestDao

package dao;

public interface TestDao {
    public void sayHello();
}

3.在Dao下，创建TestDao接口的实现类TestDaoImpl

package dao;

public class TestDaoImpl implements TestDao {

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

4.创建配置文件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">
    <!-- 将指定类TestDaoImpl配置给Spring，让Spring创建其实例 -->
    <bean id="test" class="dao.TestDaoImpl" />
</beans>

5.创建测试类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，加载配置文件
        ApplicationContext appCon = new ClassPathXmlApplicationContext("applicationContext.xml");
        TestDao tt = (TestDao) appCon.getBean("test");// test为配置文件中的id
        tt.sayHello();
    }
}

6.最后运行项目（Run As Java Application），在命令台中输出Hello World！

image