spring 入门----1

叁歲伎倆 2024-02-19 12:17 27阅读 0赞

1.使用Eclipse创建Web应用并导入jar包

![70][]

2.创建接口 TestDao

Spring 解决的是业务逻辑层和其它层的耦合问题，因此它将面向接口的编程思想贯穿整个系统应用

package dao;
    
    public interface TestDao {
    
    	public void sayHello();
    }

3.创建接口TestDao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,Study hard!");
    	}
    
    }

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">
    
        
        
        
        <bean id="test" class="dao.TestDaoImpl"></bean>
    
    </beans>

5.创建测试类

package test;
    
    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");
    		//通过容器获取test实例
    		TestDao tt =(TestDao)appCon.getBean("test"); //test为配置文件中的id
    		tt.sayHello();
    	}
    
    }

![70 1][]

[70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/69567a5d2f0a470f8cf73d3a5fd8543b.png
[70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/534c5243c07e4b9cbd15bd692f1fd127.png