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package com.itheima.service.impl;

import com.itheima.dao.UserDao;
import com.itheima.dao.impl.UserDaoImpl;
import com.itheima.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

/*  常规测试
  UserDao dao =new UserDaoImpl();
public void save() {
      dao.show();
}*/

  /*  //spring-context测试未依赖注入
public void save() {
      ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
      UserDao dao = app.getBean(UserDao.class);
      dao.show();
      System.out.println(45678);
}*/

/*
依赖注入
   UserDao dao;

      public void setDao(UserDao dao) {
         this.dao = dao;
      }

      public void save() {

      System.out.println(45678);
         dao.show();
         System.out.println(1234567890);
   }*/

@Autowired
UserDao dao;
public void save() {
      System.out.println(45678);
      dao.show();
      System.out.println(1234567890);
}

}

<?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.itheima.controller;

import com.itheima.service.UserService;
import com.itheima.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

//常规测试
@org.junit.Test
public void test1() {
      UserService service = new UserServiceImpl();
      service.save();
}

//spring-context测试未依赖注入
@org.junit.Test
public void test2() {
      ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
      UserService service = app.getBean(UserService.class);
      service.save();

}

//依赖注入
@org.junit.Test
public void test3() {
      ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
      UserService service = app.getBean(UserService.class);
      service.save();

}

//注解
@org.junit.Test
public void test4() {
      ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
      UserService service = app.getBean(UserService.class);
      service.save();

}
}

package com.itheima.dao.impl;

import com.itheima.dao.UserDao;
import org.springframework.stereotype.Repository;

@Repository
public class UserDaoImpl implements UserDao {

public void show() {

      System.out.println("dao层show方法执行");
}
}

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