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

use method post to add a record

  • 772

According to law, each method has its objective:

post to insert records,

get to get/display records,

put to modify records,

delete to remove records

I made the following code, which adds a new book to the database, so I should use the post method, but I did it with the get method, I want to convert it to a post method, how to do it?

@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

    Just add the required HTTP method in the annotation org.springframework.web.bind.annotation.RequestMappingvia the element 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;
}

    Optionally you can send the data in the body of the request and not in the URL:

    @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;
}

    Since version 4.3 of Spring it is possible to use the annotation org.springframework.web.bind.annotation.PostMapping, which acts as a shortcut to @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;
}

    Other annotations that are shortcuts:

    org.springframework.web.bind.annotation. PostMapping org.springframework.web.bind.annotation 
. DeleteMapping org.springframework.web.bind.annotation 
. GetMapping org.springframework.web.bind.annotation 
. PutMapping org.springframework.web.bind.annotation 
. Patch Mapping
    • 1

  2. POST to insert records,

    GET to get/show records,

    PUT to modify records,

    DELETE to remove records

    It is correct, however for GET according to the HTTP protocol (which is the one REST is based on) its data entry is through parameters as in your GET method, but in POST it is through a body:

    Example:

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

//Setters and Getters
}

    Controller:

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

    to create a record is also resolved with 201 instead of 200, in the HTTP status

    • 1