为什么我的控制器中的保存功能不起作用？
[英]Why the function save in my controller does not work?
问题描述
I am doing a simple crud with springboot and thymeleaf but when i try to do the update or create with the function save I lose the data of the object.
我正在用 springboot 和 thymeleaf 做一个简单的 crud，但是当我尝试使用函数 save 进行更新或创建时，我丢失了对象的数据。 I click on the buttons new and update I open the modal correctly with the data with the object charged but when i click in save i loss the object.我点击新按钮和更新按钮，我用充电对象的数据正确打开模态，但是当我点击保存时，我丢失了对象。
I believe that my problem is in the form and I do not know what it is.我相信我的问题在形式上，我不知道它是什么。 I have tried with postman and I do not receive a request when I click on save or update我尝试过邮递员，但在单击保存或更新时没有收到请求
index:指数：
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<script th:src="@{js/main.js}" src="../static/js/main.js"></script>
</body>
</head>
<body>
<div class="container">
<div class="jumbotron">
<h1>Paginación con SpringBoot</h1>
</div>
<button class="btn btn-success nBtn">New</button>
<div class="card">
<div class="card-block">
<table class="table table-hover">
<thead>
<tr>
<th>ID</th>
<th>COUNTRY</th>
<th>CAPITAL</th>
<th>ACTION</th>
</tr>
</thead>
<tbody>
<tr th:each="country :${data.content}">
<td th:text="${country.id}"></td>
<td th:text="${country.name}"></td>
<td th:text="${country.capital}"></td>
<td>
<a th:href="@{/delete/(id=${country.id})}" class="btn btn-danger dBtn">Delete</a>
<a th:href="@{/findOne/(id=${country.id})}" class="btn btn-primary eBtn">Edit</a>
</td>
</tr>
</tbody>
</table>
<hr>
</div>
<div>
<ul class="nav nav-pills nav-justified">
<li class="nav-item" th:each="i :${#numbers.sequence(0,data.totalPages-1)}">
<a th:href="@{/(page=${i})}" th:text="${i}" class="nav-link" th:classappend="${currentPage}==${i}?'active':''"></a>
</li>
</ul>
</div>
</div>
<div class="myForm">
<form th:action="@{/save}" th:object="${country}" method="post">
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Update or Create</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<div class="form-group">
<label for="id" class="col-form-label">Id:</label>
<input type="text" class="form-control" id="id" name="id" th:value="*{''}" disabled/>
</div>
<div class="form-group">
<label for="name" class="col-form-label">Name:</label>
<input type="text" class="form-control" id="name" name="name" th:value="*{''}"/>
</div>
<div class="form-group">
<label for="capital" class="col-form-label">Capital:</label>
<input type="text" class="form-control" id="capital" name="capital" th:value="*{''}"/>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<input type="submit" class="btn btn-primary" data-dismiss="modal" value="Save"/>
</div>
</div>
</div>
</div>
</form>
</div>
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<p class="alert alert-danger">Are you sure you want to delete this?</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<a href="" class="btn btn-danger" id="delRef">Delete</a>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
controller :控制器 ：
@Controller
public class CountryController {
@Autowired
private CountryRepository countryRepository;
@SuppressWarnings("deprecation")
@GetMapping("/")
public String showPage(Model model, @RequestParam(defaultValue="0") int page) {
model.addAttribute("data", countryRepository.findAll(new PageRequest(page,4)));
model.addAttribute("currentPage", page);
return "index";
}
@PostMapping("/save")
public String save(Country country) {
countryRepository.save(country);
return "redirect:/";
}
@GetMapping("/delete")
public String deleteCountry(Integer id) {
countryRepository.deleteById(id);;
return "redirect:/";
}
@GetMapping("/findOne")
@ResponseBody
public Optional<Country> FindOne(Integer id) {
return countryRepository.findById(id);
}
}
js: js：
$(document).ready(function(){
$('.nBtn, .table .eBtn').on('click', function(event){
event.preventDefault();
var href = $(this).attr('href');
var text = $(this).text();
if(text=='Edit'){
$.get(href,function(country,status){
$('.myForm #id').val(country.id);
$('.myForm #name').val(country.name);
$('.myForm #capital').val(country.capital);
});
$('.myForm #exampleModal').modal();
}else{
$('.myForm #id').val('');
$('.myForm #name').val('');
$('.myForm #capital').val('');
$('.myForm #exampleModal').modal();
}
});
$('.table .dBtn').on('click', function(event){
event.preventDefault();
var href = $(this).attr('href');
$('#myModal #delRef').attr('href',href);
$('#myModal').modal();
});});
class:班级：
@Entity
public class Country {
@Id
@GeneratedValue
private Integer id;
private String name;
private String capital;
public Country(String name, String capital) {
this.name = name;
this.capital = capital;
}
public Country() {
}
@Override
public String toString() {
return "Country [id=" + id + ", name=" + name + ", capital=" + capital + "]";
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCapital() {
return capital;
}
public void setCapital(String capital) {
this.capital = capital;
}
}
repository:存储库：
public interface CountryRepository extends JpaRepository<Country,Integer>{
}
4 个解决方案
解决方案1
1 2019-03-01 16:16:54
Possibly missing the @RequestBody annotation on the save method可能缺少 save 方法上的 @RequestBody 注释
@PostMapping("/save")
public String save(@RequestBody Country country) {
countryRepository.save(country);
return "redirect:/";
}}
解决方案2
1 2019-03-01 16:42:34
- @RequestBody as mentioned already. @RequestBody 已经提到过。
- Provide your country class code提供您的国家/地区类别代码
- What is the code for CountryRepository? CountryRepository 的代码是什么？
- If you put a break point in your controller save method do you actually get country data or is it null?如果您在控制器保存方法中放置一个断点，您实际上是获得了国家/地区数据还是为空？
As an aside you shouldn't be hitting your repository from your controller as there is no transaction management.顺便说一句，您不应该从控制器访问您的存储库，因为没有事务管理。
解决方案3
1 2019-03-01 18:21:02
Use @RequestBody and repository.saveAndFlush(entity)使用@RequestBody和repository.saveAndFlush(entity)
By using @RequestBody annotation you will get your values mapped with the model you created in your system for handling any specific call通过使用@RequestBody注释，您将获得与您在系统中创建的模型映射的值，以处理任何特定调用
On saveAndFlush , changes will be flushed to DB immediately in this command.在saveAndFlush ，更改将在此命令中DB immediately刷新到DB immediately 。 With save, this is not necessarily true and might stay just in memory, until flush or commit commands are issued.使用保存，这不一定是真的，并且可能只保留在内存中，直到发出刷新或提交命令。
@PostMapping("/save")
public String save(@RequestBody Country country) {
countryRepository.saveAndFlush(country);
return "redirect:/";
}
解决方案4
1 2020-04-25 12:12:34
@mantamusica if you are still interested in, I have a solution for you. @mantamusica如果您仍然感兴趣，我为您提供解决方案。
@Jason Portnoy @Patel Romil @Jason Portnoy @Patel Romil
In this exact case, add annotations @RequestBody returns error code 415.在这种确切的情况下，添加注释@RequestBody返回错误代码 415。
The solution to this problem lies on the HTML side, or rather Bootstrap.这个问题的解决方案在于 HTML 端，或者更确切地说是 Bootstrap。
Just delete删除即可
data-dismiss="modal"
from input从输入
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<input type="submit" class="btn btn-primary" data-dismiss="modal" value="save"/>
</div>
... and it works for me :) ...它对我有用:)
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