Spring框架的环境搭建和测试实现

<dependencies>
  <!-- 添加junit的jar包 -->
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.10</version>
  </dependency>
  <!-- 添加spring的jar包 -->
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.1.3.RELEASE</version>
  </dependency>
</dependencies>

<?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">
  
  
</beans>

package com.yanan.dao;

/**
 *  测试接口
 * @author 慕客
 *
 */
public interface UserDao {

  public void add();
}

package com.yanan.dao.impl;

import com.yanan.dao.UserDao;

/**
 * 该实现类实现了UserDao接口
 * @author 慕客
 *
 */
public class UserDaoImpl implements UserDao{

  @Override
  public void add() {
    System.out.println("UserDaoImpl.add方法执行了......");
  }
}

<!-- 将UserDao接口的实现类的实例交给spring创建 -->
<bean id="userDao" class="com.yanan.dao.impl.UserDaoImpl"></bean>

package com.yanan.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yanan.dao.UserDao;
import com.yanan.dao.impl.UserDaoImpl;

/**
 * 测试类 
 * @author 慕客
 *
 */
public class UserDaoTest {
  
  @Test
  public void test1() {
    // 定义Spring配置文件的路径
    String xmlPath = "applicationContext.xml";
    // 初始化 Spring 容器，加载配置文件
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);
    // 通过 IoC 容器获取 userDao 实例。applicationContext.getBean(全限定类名.class)  
    UserDao userDaoImpl = (UserDao) applicationContext.getBean(UserDaoImpl.class);
    // 调用 UserDao 的 add() 方法
    userDaoImpl.add();
  }
}