==================
Spring MVC接请求体
==================

/pom.xml：

<!-- Jackson Databind -->
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.3</version>
</dependency>

/src/main/java/cn/tedu/springmvc/pojo/Book.java：

public class Book {
    private int id;
    private String name;
    private String author;
    private double price;

    public Book() {
    }

    public Book(int id, String name, String author, double price) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.price = price;
    }

    public int getId() {
        return id;
    }

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

    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;
    }

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

/src/main/java/cn/tedu/springmvc/controllers/BookController.java：

@Controller
@RequestMapping("/BookController")
public class BookController {
    ...

    @RequestMapping("/addBookByBody")
    public void addBookByBody(@RequestBody Book book) {
        System.out.println("控制器> 添加一本图书");
        System.out.println("控制器> 书名：" + book.getName());
        System.out.println("控制器> 作者：" + book.getAuthor());
        System.out.println("控制器> 价格：" + book.getPrice());
    }

    ...
}

RequestBody注解指明将请求体中的Json字符串解析为Java对象，解析过程中需要用到Jackson包。

可以同时使用RequestParam、RequestHeader和RequestBody注解：

- 被RequestParam注解修饰的参数从请求行接收值
- 被RequestHeader注解修饰的参数从请求头接收值
- 被RequestBody注解修饰的参数从请求体接收值

例程：SpringMVC