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deluf
Asked: 2020-05-01 14:23:14 +0800 CST 2020-05-01 14:23:14 +0800 CST

使用 post 方法添加记录

  • 772

根据法律，每种方法都有其目标：

发布以插入记录，

获取/显示记录，

把修改记录，

删除以删除记录

我做了下面的代码，往数据库中添加了一本新书，所以我应该使用post方法，但是我用get方法做​​了，我想将它转换为post方法，怎么做？

@RequestMapping(value = "/add/{id}/{name}/{author}/{price}")
    public Book addBook(@PathVariable int id, @PathVariable String name, @PathVariable String author,
            @PathVariable long price) {
        Book book = new Book();
        book.setId(id);
        book.setName(name);
        book.setAuthor(author);
        book.setPrice(price);
        bookService.saveBook(book);
        return book;
    }
java

2 Answers

  1. Best Answer

    org.springframework.web.bind.annotation.RequestMapping只需通过元素在注解中添加所需的 HTTP 方法method：

    @RequestMapping(value = "/add/{id}/{name}/{author}/{price}",
            method = RequestMethod.POST)
    public Book addBook(@PathVariable int id, @PathVariable String name, @PathVariable String author,
            @PathVariable long price) {
    Book book = new Book();
    book.setId(id);
    book.setName(name);
    book.setAuthor(author);
    book.setPrice(price);
    bookService.saveBook(book);
    return book;
}

    或者，您可以在请求正文中而不是在 URL 中发送数据：

    @RequestMapping(value = "/add",
            consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE
            method = RequestMethod.POST)
    public Book addBook(
            @RequestParam(name = "id", required = false, defaultValue = "0") int id,
            @RequestParam(name = "name", required = true) String name,
            @RequestParam(name = "author", required = true) String author,
            @RequestParam(name = "price", required = true) long price) {
    Book book = new Book();
    book.setId(id);
    book.setName(name);
    book.setAuthor(author);
    book.setPrice(price);
    bookService.saveBook(book);
    return book;
}

    从 Spring 4.3 版开始，可以使用注释org.springframework.web.bind.annotation.PostMapping，它充当以下操作的快捷方式@RequestMapping(method = RequestMethod.POST)：

    @PostMapping(value = "/add",
            consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public Book addBook(
            @RequestParam(name = "id", required = false, defaultValue = "0") int id,
            @RequestParam(name = "name", required = true) String name,
            @RequestParam(name = "author", required = true) String author,
            @RequestParam(name = "price", required = true) long price) {
    Book book = new Book();
    book.setId(id);
    book.setName(name);
    book.setAuthor(author);
    book.setPrice(price);
    bookService.saveBook(book);
    return book;
}

    其他作为快捷方式的注释：

    org.springframework.web.bind.annotation。PostMapping org.springframework.web.bind.annotation 
。删除映射 org.springframework.web.bind.annotation 
。获取映射 org.springframework.web.bind.annotation 
。PutMapping org.springframework.web.bind.annotation 
。补丁映射
    • 1

  2. POST 插入记录，

    GET 获取/显示记录，

    PUT 修改记录，

    DELETE 删除记录

    这是正确的，但是对于根据 HTTP 协议（​​REST 所基于）的 GET，它的数据输入是通过 GET 方法中的参数，但在 POST 中它是通过一个主体：

    例子：

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

//Setters and Getters
}

    控制器：

    @PostMapping(value = "/add")
    public EntityResponse addBook(@RequestBody Book book) {
    bookService.saveBook(book);
    return new ResponseEntity(book, HttpStatus.CREATED);
}

    在 HTTP 状态下，创建记录也被解析为 201 而不是 200

    • 1