如何从一个jsp在Spring MVC中更新两个实体/模型元素？ [英] How to update two entities/model elements from one jsp in Spring MVC?

问题描述

我的要求是通过向用户提供一个表单，在JSP中使用来自两个实体（例如 UserDetails 和 EmploymentDetails ）的输入字段来执行CREATE操作。

My requirement is to do a CREATE operation by providing the user with a form in a JSP with input fields from two entities (e.g. UserDetails and EmploymentDetails)

使用单个提交在单个jsp中更新两个表单的最有效方法是什么？

What is the most effective way to update two forms in a single jsp using a single submit?

是将两个实体组合成单个包装类，然后将该对象作为模型发送。这是唯一的解决方案吗？

One approach I know of is to combine the two entities into a single wrapper-class and then send that object as Model. Is that the only solution?

请指导。

推荐答案

一个常见的做法是将任意数量的对象放在包装类中，并使用此对象以单一形式提交数据。此外，您可以在任何对象中使用JSR-303验证：

It's a common practice to put any number of objects in a wrapper class and use this one to submit data with a single form. Additionally, you can use JSR-303 validation in any of objects:

public class MyForm {

    @Valid
    private UserDetails userDetails;

    @Valid
    private EmploymentDetails employmentDetails;

    ...

}

形式：

<form:form modelAttribute="myForm" method="post">
    <form:input path="userDetails.property1"/>
    <form:input path="userDetails.property2"/>
    <form:input path="employmentDetails.property1"/>
    <input type="submit" value="create"/>
</form:form>

和您的控制器：

@RequestMapping(value = "/", method = RequestMethod.POST)
public ModelAndView create (@Valid MyForm myForm, BindingResult bindingResult) {

    if (bindingResult.hasErrors()) {
        // here you can retrieve form errors of both objects
    }

    UserDetails userDetails = myForm.getUserDetails();
    EmploymentDetails employmentDetails = myForm.getEmploymentDetails();

    ...

}

方法是通过JSON保存对象，但我认为在这种情况下是过度和过于复杂。

Another approach is to save objects via JSON, but I think is overkill and overcomplicated in this case.

这篇关于如何从一个jsp在Spring MVC中更新两个实体/模型元素？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！