表单验证播放框架2.0 [英] Form validation play framework 2.0

问题描述

我正在关注 http://www.playframework.org/documentation/2.0/JavaForms

我创建了一个类LoginForm.java（而不是示例中的User.class。不是用于持久化的类，只是一个表单值持有者）

I've created a class LoginForm.java (Instead of User.class from the example. Not a class for persisting, just a form values holder)

package domain;

import static play.data.validation.Constraints.*;

public class LoginForm {

        @Required
        public String email;
        public String password;

}

在我的控制器中我做（作为示例），但我将值设置为空字符串以尝试@Required注释。

And in my controller i do (as the example), but i set the values to empty Strings to try the @Required annotation.

Form<LoginForm> loginForm = form(LoginForm.class);
Map<String,String> anyData = new HashMap();
anyData.put("email", "");
anyData.put("password", "");

//Faking a post
LoginForm postedLoginForm = loginForm.bind(anyData).get();

if(loginForm.hasErrors()) {
  //Just for this test task, should have another error handling..
  return ok("@Required annotation kicked in..");
} else {
  return ok("Got form values, email: " + postedLoginForm.email + " password: " + postedLoginForm.password);
}

但是：

LoginForm postedLoginForm = loginForm.bind(anyData).get();

我收到执行异常[[IllegalStateException：No value]]

I get an Execution exception [[IllegalStateException: No value]]

因此它永远不会检查/来到

So it never checks/comes to

if(loginForm.hasErrors()) 

有谁知道这是为什么？如果我将值设置为示例：

Does anyone know why this is? If i set the values as the example:

Map<String,String> anyData = new HashMap();
anyData.put("email", "[e-mail]");
anyData.put("password", "secret");

一切正常，我使用正确的值检索LoginForm对象。
我应该抓住异常吗？不应该玩，并设置loginForm.hasErrors = true？

Everything works and i retrieve the LoginForm object with the correct values. Am i supposed to catch the Exception? Shouldn't play take care of that and set loginForm.hasErrors = true?

感谢您的帮助！

推荐答案

这是预期的行为。

请注意，您必须使用表格上的.get（）检查错误后。

Note that you must use .get() on form After check for errors.

LoginForm preLoginForm = loginForm.bind(anyData);

if(loginForm.hasErrors()) {
    //Just for this test task, should have another error handling..
    return ok("@Required annotation kicked in..");
}
LoginForm postedLoginForm = preLoginForm.get();
// ... Now use postedLoginForm 

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