Here I will use spring to develop a simple bookstore project
Step1: The development software used is idea, and the jar package used is
The download of these jars can be downloaded on the official website , choose the 5.2.6 version to download, if you don’t, please comment on the private message below
Step2: Open the idea, create a java project, and then name the project BookStore
Step3: Import the jar package
① Create a folder libs under the project folder to store jar packages, and copy the above 12 jar packages directly into the folder
②Import the jar, the first step is simply to copy the jar package into it, and it cannot be used yet
Step4: Create the package com.tty.spring under src , and then continue to build 5 packages under the package, which are the configuration folder config, the entity folder entity, and then the three-tier architecture (control layer control, business layer service, persistence layer dao)
Step5: Create a class BookConfig under the configuration folder and write code
Step6: Create a class Book under the entity folder and write code
Step7: Create interface BookDao and class BookDaoImpl under the persistence layer folder, and write code
Step8: Create a class BookService under the business layer folder and write code
Step9: Create a class BookControl under the control layer and write code
Step10: Create three classes under the package com.tty.spring, namely BookStoreEntry entry class, BookStoreProxy enhancement class, TestBookStore test class, and write code
① Let's write the enhanced class first, which is also called "agent"
② Let's write the test class first, this class is for testing
After writing here, we can simply test it
The result is as follows:
③ Finally, we will write the bookstore entrance class
Click the main method to run once, and the result is as follows:
A simple small bookstore project is completed, and various source codes are attached below:
// 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！");
}
}
}