Question

大家好（首先发布在这里！）

我遇到了一个我正在开发的简单Web应用程序的问题。

我使用spring boot创建了一个休息服务（POST），但是当我从前端尝试这个服务时，我无法在@RequestBody上检索任何值。

调用控制器的javascript是以下

bookStore.html

Traceback (most recent call last):
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 194, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 168, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/opt/python/run/venv/local/lib64/python3.6/site-packages/psycopg2/__init__.py", line 130, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: Connection refused
    Is the server running on host "127.0.0.1" and accepting
    TCP/IP connections on port 5432?


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django_celery_beat/schedulers.py", line 238, in sync
    with transaction.atomic():
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/transaction.py", line 147, in __enter__
    if not connection.get_autocommit():
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 378, in get_autocommit
    self.ensure_connection()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 216, in ensure_connection
    self.connect()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 194, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 168, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/opt/python/run/venv/local/lib64/python3.6/site-packages/psycopg2/__init__.py", line 130, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: could not connect to server: Connection refused
    Is the server running on host "127.0.0.1" and accepting
    TCP/IP connections on port 5432?

OrderController.java

                //Submit shopping cart to the backend to be saved
            checkout : function() {
                //Place holder for the POST Request
                this.$http.post('/createOrder', {
                    'shopCart' : {'basket' : this.shoppingCart}
                });
                //END Post request
            }

ShoppingCart.java

    @RequestMapping(value = "/createOrder",
        method = RequestMethod.POST)
public String createOrder(@RequestBody ShoppingCart shopCart, Model model) {
    Order order = new Order();
    Float totalPrice = 0f;
    order.setCreationDate(new Date());
    List<String> bookIdList = new ArrayList<>();
    for (Book book : shopCart.getBasket()) {
        bookIdList.add(book.getId());
        totalPrice = totalPrice + book.getPrice();
    }
    order.setItemList(bookIdList);
    order.setTotalOrder(totalPrice);
    orderRepo.save(order);
    List<Order> orderList = orderRepo.findAll();
    model.addAttribute("addedOrder", order);
    model.addAttribute("orderList", orderList);
    return "orderList";
}

}

请注意，shoppingCart被定义为VUE js中的对象数组。当我设置此值时，它看起来像这样

public class ShoppingCart {
private List<Book> basket;

public List<Book> getBasket() {
    return basket;
}

public void setBasket(List<Book> basket) {
    this.basket = basket;
}

@Override
public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("BookList [shoppingCart=");
    builder.append(basket);
    builder.append("]");
    return builder.toString();
}

问题是shopCart始终为null。我错过了什么吗？它似乎是一个基本的事情，它与我之前完成的RequestParam控制器一起工作

Answer 1

这是一篇旧帖子，但此信息可能对某人有所帮助。在顶部使用 @RequestBody 完成并映射到模型的方式应该与 @RestController 一起使用，但有一个小例外，即响应不应是字符串，而可能是具有更新值的模型。

就我而言，我遇到了一个问题，即从 SwaggerUI 错误地导入了 @RequestBody 而不是“ import org.springframework.web.bind.annotation.RequestBody;" 这给了我一个难以捕捉的错误。

只要 pojo 是可序列化的，它就应该可以工作。此外，如果您从手动构建的字符串发送 JSON，请确保在属性的大小写中遵循命名约定。

@RequestBody null值（Spring boot和Vue JS）

1 个答案: