如何利用spring框架来开发一个简单的小项目——书店项目

这里我将用spring来开发一个简单的书店项目

Step1:所用到的开发软件为 idea , 所用到的jar包为

这些jar的下载可在 官网 下载,选择5.2.6版本下载,不会的在下面评论私信

Step2:打开idea,创建java项目,然后项目命名 BookStore

Step3:导入jar包

          ①项目文件夹下创建文件夹libs,用来存放jar包,并将上面的12个jar包都直接复制到文件夹内

                

       ②将jar导入,第一步只是简单的将jar包复制进去了,还不能使用         

   

 

 

Step4:在src下建立包 com.tty.spring,然后在该包下继续建5个包,分别是配置文件夹 config, 实体文件夹 entity , 然后是三层架构 (控制层 control , 业务层 service , 持久层 dao)

Step5: 在配置文件夹下建类 BookConfig,并编写代码

 

 

Step6: 在实体文件夹下建类 Book,并编写代码

Step7: 在持久层文件夹下建接口BookDao 和类BookDaoImpl,并编写代码

 

 

Step8: 在业务层文件夹下建类BookService,并编写代码

 

 

 Step9: 在控制层下建类BookControl,并编写代码

 

 

Step10: 在包com.tty.spring下建立三个类,分别是 BookStoreEntry 入口类,BookStoreProxy 增强类,TestBookStore 测试类,并编写代码

 

         ①我们先来编写增强类,这个也叫  “代理”

         ②我们先来编写测试类,这个类是做测试用的

 

写完了这里,我们可以简单的测试一下啦

 结果如下:

③我们最后来编写书店入口类

 点击main方法运行一次,结果如下:

 一个简单的书店小项目就完成了,下面附上各类的源码:

// 配置类源码
package com.tty.spring.config;


import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@ComponentScan(basePackages = "com.tty.spring")
@EnableAspectJAutoProxy
public class BookConfig {
}
//实体类源码
package com.tty.spring.entity;


import org.springframework.stereotype.Component;

@Component
public class Book {

    private String b_name;
    private int b_price;

    public void setB_name(String b_name) {
        this.b_name = b_name;
    }

    public void setB_price(int b_price) {
        this.b_price = b_price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "b_name='" + b_name + '\'' +
                ", b_price=" + b_price +
                '}';
    }


}
//持久层 接口源码
package com.tty.spring.dao;

import com.tty.spring.entity.Book;

public interface BookDao {
    public Book queryBook();
}
//持久层接口实现类源码
package com.tty.spring.dao;


import com.tty.spring.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class BookDaoImpl implements  BookDao{

    @Autowired
    private Book book;

    @Override
    public Book queryBook() {
        book.setB_name("spring教程");
        book.setB_price(99);
        return this.book;
    }
}
//服务层源码
package com.tty.spring.service;


import com.tty.spring.dao.BookDao;
import com.tty.spring.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

@Service
public class BookService {

    @Autowired
    private BookDao bookDao;

    public Book queryBook(){
        return bookDao.queryBook();
    }

}
//控制层源码
package com.tty.spring.control;


import com.tty.spring.entity.Book;
import com.tty.spring.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;

@Controller
public class BookControl {


    @Autowired
    private BookService bookService;

    public Book sellBook(){
        return bookService.queryBook();
    }

}
//增强类源码
package com.tty.spring;


import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class BookStoreProxy {

    @Before(value = "execution(* com.tty.spring.service.BookService.queryBook(..))")
    public void before(){
        System.out.println("现在开始卖书啦!....");
    }

}
//测试类源码
package com.tty.spring;

import com.tty.spring.config.BookConfig;
import com.tty.spring.control.BookControl;
import com.tty.spring.entity.Book;
import com.tty.spring.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestBookStore {
    @Test
    public void test(){
        ApplicationContext context = new AnnotationConfigApplicationContext(BookConfig.class);
        BookControl bookControl = context.getBean("bookControl", BookControl.class);
        Book book = bookControl.sellBook();
        System.out.println(book);

    }
}
//书店入口类
package com.tty.spring;

import com.tty.spring.config.BookConfig;
import com.tty.spring.control.BookControl;
import com.tty.spring.entity.Book;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.Scanner;

public class BookStoreEntry {
    public static void main(String[] args) {

        ApplicationContext context = new AnnotationConfigApplicationContext(BookConfig.class);
        BookControl bookControl = context.getBean("bookControl", BookControl.class);


        System.out.println("您好! 欢迎光临本书店");
        System.out.println("请选择  1. 购书  |   2.离开 ");
        Scanner sc=new Scanner(System.in);
        int val=sc.nextInt();
        if(val==1){
            Book book = bookControl.sellBook();
            System.out.println(book);
        }
        if (val==2){
            System.out.println("欢迎下次再来!");
        }



    }
}

             

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转载自blog.csdn.net/qq_49174867/article/details/124514360
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