没有为类型 HttpServletRequest 定义方法 setArraybute(String, List<Rectangle>)
时间: 2024-06-12 21:03:47 浏览: 6
这是因为 HttpServletRequest 接口是 Java Servlet API 中的一部分,它是用于处理 HTTP 请求的接口,并且并不提供设置 List<Rectangle> 类型属性的方法。如果您需要在 HttpServletRequest 中设置 List<Rectangle> 类型的属性,您可以通过将其序列化为字符串或将其作为属性的值来实现。或者,您可以考虑创建一个自定义的 HttpServletRequest 子类,以提供您所需的方法。
相关问题
protected R<String> login(HttpServletRequest request)
As an AI language model, I cannot access the full context of your code or understand the specific requirements of your program, so I can only provide a general explanation.
This code snippet seems to define a method called "login" that takes in a HttpServletRequest object as a parameter and returns a protected R<String> object. The "protected" keyword suggests that this R<String> object is not publicly accessible and may require some form of authentication or authorization to access.
Without knowing the implementation details of the R<String> class or the purpose of the login method, it is difficult to provide a more specific explanation. However, based on the method name and parameter type, it is likely that this method is responsible for authenticating a user's login credentials and returning a response object indicating whether the login was successful or not.
List<Product> productList = (List<Product>)request.getAttribute("productList");
这段代码是从HttpServletRequest对象中获取名为"productList"的属性,并将其强制转换为List<Product>类型的对象。前提是在之前的代码中,已将名为"productList"的属性设置到了HttpServletRequest对象中。通常在Servlet中,我们可以通过request.setAttribute()方法设置请求属性,并在JSP页面中通过EL表达式${productList}来获取它。