吴裕雄天生自然Spring第一个Spring入门程序

1．使用Eclipse创建Web应用并导入JAR包

2． 创建接口TestDao

3．创建接口TestDao的实现类TestDaoImpl

4．创建配置文件applicationContext.xml

5．创建测试类

package dao;

public interface TestDao {
    public void sayHello();

}

package dao;

public class TestDaoImpl implements TestDao{
    @Override
    public void sayHello() {
        System.out.println("Hello, Study hard!");
    }

}

<?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>

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) {
        @SuppressWarnings("resource")
        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();
    }

}