使用 Spring Forms 编辑对象属性

发布于 2024-11-07 16:15:30 字数 648 浏览 0 评论 0原文

我对如何使用 Spring Forms 编辑对象有点困惑，例如：假设我有一个对象 Person ，它有很多属性，因为我从 dao 获取它，并且我只想要提供“街道”字段进行编辑，我会在我的 PeopleController 中添加这个：

@RequestMapping("editPerson")
public void editPerson (Model model) {
    Person person = dao.getThatPerson ();
    model.addAttribute (person);
}

在我的 视图文件 中，除了这个我什么都没有：

<form:form method="post" action="" commandName="person">
    <form:input path="street" />
    <input type="submit" value="Edit!" />
</form:form>

所以当我 >post 表单，将表单的其他属性Person 对象被保留吗？比如人的名字、姓氏、用户名、年龄等等。否则，这怎么可能实现呢？

原文

I'm a bit confused about how an object could be edited with Spring Forms, for instance: suppose I have an object Person who has a lot of attributes because I obtain it from a dao, and I only want to provide the field "street" for editing, I would have this in my PeopleController:

@RequestMapping("editPerson")
public void editPerson (Model model) {
    Person person = dao.getThatPerson ();
    model.addAttribute (person);
}

And in my view file I would have nothing but this:

<form:form method="post" action="" commandName="person">
    <form:input path="street" />
    <input type="submit" value="Edit!" />
</form:form>

So when I post the form, will the other attributes of the Person object be preserved? For instance person's name, surname, username, age, etc. Otherwise, how could this be accomplished?

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迷乱花海 2024-11-14 16:15:30

将模型对象存储在会话中，如下所示：

@Controller
@SessionAttributes("person")
public class YourController {
...
  @ModelAttribute("person")
  public Person getPerson() {
      return new Person();
  }

  @RequestMapping("editPerson")
  public void editPerson (@ModelAttribute("person") Person person) {
    person = dao.getThatPerson ();
  }

  @RequestMapping(value="postperson", method = RequestMethod.POST)
  public void postPerson(@ModelAttribute("person") Person person) {
    // do stuff with person
  }
}

Store your model object in session, like so:

@Controller
@SessionAttributes("person")
public class YourController {
...
  @ModelAttribute("person")
  public Person getPerson() {
      return new Person();
  }

  @RequestMapping("editPerson")
  public void editPerson (@ModelAttribute("person") Person person) {
    person = dao.getThatPerson ();
  }

  @RequestMapping(value="postperson", method = RequestMethod.POST)
  public void postPerson(@ModelAttribute("person") Person person) {
    // do stuff with person
  }
}

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