SpringIoc,DI基本操作

首先创建一个Maven Web项目

 最后点击finish mavenweb项目就创建好了

创建好后src/main下不存在java和resources文件夹需要手动创建

 设置好后在pom.xml中导入spring依赖

    
      org.springframework
      spring-webmvc
      5.2.0.RELEASE
    
    
      commons-logging
      commons-logging
      1.2
    

 创建dao层和service层

 在dao层接口中写入say()方法并在实现类中实现方法service同理

写完方法后在resources中创建applicationContext.xml

 在applicationContext.xml中注册dao层的bean

创建测试类测试IOC

package com.wang;

import com.wang.dao.UserDao;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestIoc {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserDao userDao = context.getBean("userDao", UserDao.class);
        userDao.say();
    }
}

测试成功

 DI注入

在applicationContext.xml中加入service层的bean并关联dao层bean

创建DI测试类测试DI注入

package com.wang;

import com.wang.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDI {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = context.getBean("userService", UserService.class);
        userService.say();
    }
}

测试成功