如何从 JSP 表单获取表单数据并将其发送到数据库控制器和 RestController 并将其显示回另一个 JSP？

Question

I am doing a spring boot project where I have to use JSP, Controller and RestController along with SQL database. When I try to map the POST method from JSP into a controller, either it is showing null value or showing error.

the jsp page is:

    <h3>To add an Item:</h3>
    <form action="additem" method="post">
        Enter Color  name: <input type="text" name="color"><br>
        Enter Description: <input type="text" name="description"><br>
        Enter Price: <input type="number" name="price"><br>
        Enter Shoe Name: <input type="text" name="shoe_name"><br>
        Enter Size: <input type="text" name="size"><br>
        Enter User Group: <input type="text" name="user_group"><br>
        <button>Submit</button>
    </form>

The controller is:

    @RequestMapping(value="/additem", method=RequestMethod.POST)
    public String insertItem(Model model, @RequestParam(value = "shoe_name") String shoename, ShoeData data) {
        data = resource.createShoe(shoename, data);
        model.addAttribute("totalShoes", data);
        return "warehouse";
    }

the restful controller is:

@RestController
public class RestfulResource {

    @Autowired
    private ShoeService shoeService;

    @PostMapping(path = "/{shoename}/shoelist")
    public ShoeData createShoe(@PathVariable String shoename, @Valid 
   @RequestBody ShoeData data) {
        ShoeData saveData = shoeService.insertData(data);
        return saveData;
    }

the JSP page to display the result:

    <c:forEach var="item" items="${totalShoes}"> 

            <tr>
                <td>${item.id}</td>
                <td>${item.color}</td>
                <td>${item.description}</td>
                <td>${item.price}</td>
                <td>${item.shoeName}</td>
                <td>${item.size}</td>
                <td>${item.userGroup}</td>              
            </tr>
            
    </c:forEach>

the error is:

There was an unexpected error (type=Bad Request, status=400). Validation failed for object='shoeData'. Error count: 1 org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'shoeData' on field 'price': rejected value []; codes [typeMismatch.shoeData.price,typeMismatch.price,typeMismatch.int,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [shoeData.price,price]; arguments []; default message [price]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'price'; For input string: ""]

the restcontroller is working fine and able to POST data through advanced REST client. But, I am not able to get data from form into the database and display it in the JSP page as it is showing the above error. How can I get ShoeData entity inside the controller method?

Answer 1

I solved it on my own.

The controller class is:

    @RequestMapping(value="/additem", method=RequestMethod.POST)
    public String insertItem(Model model, @RequestParam(value = "shoe_name") String shoename, ShoeData data) {
        List<ShoeData> convertedData = new ArrayList<ShoeData>();
        convertedData.add(data);
        System.out.println(data.getClass());
        model.addAttribute("totalShoes", convertedData);
        return "warehouse";
    }

Restful controller class is as below:

@PostMapping(path = "/{shoename}/shoelist")
    public ShoeData createShoe(@PathVariable String shoename, @Valid @RequestBody ShoeData data) {
        ShoeData saveData = shoeService.insertData(data);
        return saveData;
    }

I still got error that there is type mismatch between the price variable in model class which was int but the method was trying to covnert to String which caused the error, and so I changed the type of the price variable to String for now. I will identify the root cause and update soon.