java - Flash 范围和请求范围之间的区别

Question

Flash Scope 和 View Scope 有什么区别？

有人可以举例说明吗？

问候，

Answer 1

Flash Scope From the DOC :

The Flash scope works exactly like the Session, but with two differences: data are kept for only one request the Flash cookie is not signed, making it possible for the user to modify it.

示例:

public static Result index() {
  String message = flash("success");
  if(message == null) {
    message = "Welcome!";
  }
  return ok(message);
}

public static Result save() {
  flash("success", "The item has been created");
  return redirect("/home");
}

请求范围很简单，它仅针对特定请求而存在。