6.7 實作一個 Controller Class

我們實作一個 Controller Class，用處理來自前端裝置的 http request 及做正確的 http response。

程式源碼如下 ：

 package edume.microservice.controller;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import edume.microservice.model.Book;
import edume.microservice.service.IBookService;

@RestController
@PostMapping("/api/v1/")
public class BookController
{
    private Log logger = LogFactory.getLog(BookController.class);
    private IBookService service = null;

    @Autowired
    public BookController(IBookService service)
    {
        this.service = service;
    }

    @PostMapping("/book")
    public Map<String, Object> create(@RequestBody Map<String, Object> bookMap)
    {
        String name = bookMap.get("name").toString();
        String isbn = bookMap.get("isbn").toString();
        String author = bookMap.get("author").toString();
        int page = Integer.parseInt(bookMap.get("page").toString());

        Book book = new Book(name, isbn, author, page);

        this.service.createBook(book);

        Map<String, Object> response = new LinkedHashMap<String, Object>();
        response.put("message", "New book created successfully !");
        response.put("book", book);

        return response;
    }

    @GetMapping( "/account/{bookId}")
    public Book getBookDetails(@PathVariable("bookId") String bookId)
    {
        return this.service.getBook(bookId);
    }

    @GetMapping("/books")
    public Map<String, Object> getAllBooks()
    {
        List<Book> books = this.service.getAllBooks();

        Map<String, Object> response = new LinkedHashMap<String, Object>();
        response.put("totalBooks", books.size());
        response.put("books", books);

        return response;
    }

    @PutMapping("/account/{bookId}")
    public Map<String, Object> editBook(@PathVariable("bookId") String bookId, @RequestBody Map<String, Object> bookMap)
    {
        String name = bookMap.get("name").toString();
        String isbn = bookMap.get("isbn").toString();
        String author = bookMap.get("author").toString();
        int page = Integer.parseInt(bookMap.get("page").toString());

        logger.info(
        "update book >>> Id : " + bookId + ", name :" + name + ", isbn :" + isbn + ", author :" + author + ", page :" + page);

        Book book = new Book(name, isbn, author, page);
        book.setId(bookId);
        this.service.updateBook(book);

        Map<String, Object> response = new LinkedHashMap<String, Object>();
        response.put("message", "Book Updated successfully");
        response.put("book", book);

        return response;
    }

    @DeleteMapping("/account/{bookId}")
    public Map<String, String> deleteBook(@PathVariable("bookId") String bookId)
    {
        this.service.deleteBook(bookId);

        Map<String, String> response = new HashMap<String, String>();
        response.put("message", "Book deleted successfully");

        return response;
    }
}