Spring基础学习（二注解new实例对象）

 

一般自己写的类就用@也就是注解实例化，导入的jar架包就需要用bean实例化

applicationContext.xml

 

Book 类 

package com.baidu.book.domain;

import org.springframework.stereotype.Component;

@Component
public class Book {
	private String bookid;
	private String bookname;

}

BookServiceImpl

//括号中的bookService为new后的名字，不写默认为类名第一字小写
@Component("bookService")
public class BookServiceImpl implements BookService{
	
	@Autowired
	private BookDao bookDao = null;
	
	@Override
	public void save() {
		bookDao.save();		
	}

}

BookImpl类

@Component("bookDao")
public class BookImpl implements BookDao{

	@Override
	public void save() {
		System.out.println("我是测试滴");
		
	}

}

Test类

public class test {
	public static void main(String[] args) throws ServletException, IOException {
		ClassPathXmlApplicationContext cxt = new ClassPathXmlApplicationContext("applicationContext.xml");
		BookDao bookDao = (BookDao) cxt.getBean("bookDao");
		bookDao.save();
		BookService bookService = (BookService) cxt.getBean("bookService");
		bookService.save();
		BookController studentController = (BookController) cxt.getBean("bookController");
		studentController.doGet();
	}

}