三.Spring Boot 的第一个起步练习

1.前期项目建立及配置

• Create New Project ---> Spring Initializr --->Next

  
  项目建立1.png
  项目建立2.png

• 填写Group 、Artifact (其他默认) --->Next

  
  项目建立3.png

• Spring Boot 选择2.1.3（稳定版，其他暂时默认）---> Next

  
  项目建立4.png

• 填写项目名（注意路径一致）---> Finish

项目建立5.png

• pom.xml添加配置(注意添加位置)

<!--字符编码-->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

项目建立6.png

• 建立文件夹 如图：

  
  项目建立7.png

2.起步练习

2.1entity (Book 类)

package com.springboot.quickstart.entity;

public class Book {
    private Integer id ;
    private String name;
    private Double price;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public Book(Integer id, String name, Double price) {
        this.id = id;
        this.name = name;
        this.price = price;
    }

    public Book() {
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                '}';
    }
}

2.2 dao (BookDAO)

package com.springboot.quickstart.dao;

import com.springboot.quickstart.entity.Book;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

@Component
public class BookDAO {
    public List<Book> getBook(){
       List<Book> books = new ArrayList<>();
        books.add(new Book(1, "SpringBoot实战", 88.7));
        books.add(new Book(2, "SpringMVC", 98.7));
        books.add(new Book(3, "Spring", 80.7));
        books.add(new Book(4, "SpringBoot", 100.2));
        return books;

    }

}

2.3 Controller (BookController)

package com.springboot.quickstart.controller;

import com.springboot.quickstart.dao.BookDAO;
import com.springboot.quickstart.entity.Book;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.List;

@RestController
public class BookController {
    @Resource
    private BookDAO bookDAO;

    @RequestMapping(value = "/books", method = RequestMethod.GET)
    public List<Book> getBooks() {
        return bookDAO.getBook();
    }


}

2.4 Postman运行

运行截图.png