1.springBoot起步练习

1.新建一个quickStart模块

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2.在com.springboot.quickstart包下建entity,dao,controller包如图：

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3.在entity包下建立book类

package com.springboot.quickstart.entity;

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

    public Book() {
    }

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

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

4.在dao包内建BookDAO类

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;

    }
}

5.在controller内建bookController类

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;

//注入一个springdao
@RestController
public class BookController {
    @Resource
    private BookDAO bookDAO;

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

6.运行主类quickstartApplication(一定要先运行主类，才能用postman测试)

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出现最后两行字说明运行成功了，然后测试

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出现200就说明运行成功