Spring Boot 学习2.1--后端返回JSON数据

目前的Web开发模式都是基于前后端分离的方式，JSON是主流的前后端数据相互传输的方式。

JSON的依赖我们在springboot中已经默认配置完成了

Demo:  我们在Bean文件夹下创建一个Book类:

package com.example.demo.bean;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.Date;
@Component
@ConfigurationProperties(prefix = "book")
public class Book {
    private String name;
    private String author;
    @JsonIgnore
    private double price;
    @JsonFormat(pattern = "yyyy-MM-dd")
    private Date publicationDate;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    public Date getPublicationDate() {
        return publicationDate;
    }
    public void setPublicationDate(Date publicationDate) {
        this.publicationDate = publicationDate;
    }
}

然后在程序的控制器类中添加以下代码:

    @GetMapping("/book")
    @ResponseBody
    public Book book(){
        Book book = new Book();
        book.setAuthor("Rod Johnson ");
        book.setName("Spring Boot");
        book.setPrice(36.50);
        book.setPublicationDate(new Date());
        return book;
    }

在浏览器中输入:localhost:8000/book 就可以在页面上看到返回的JSON数据了