Spring MVC的绑定:如何绑定的ArrayList< ...&GT ;? [英] Spring MVC Binding: How to bind ArrayList<...>?

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问题描述

我有一个DTO(豆)与的ArrayList 字段:

I've got a DTO (bean) with ArrayList field:

public MyDTO {
  ...
  private List<MyThing> things;
  ...
  ... getters, setters and so on
}

在我initBinder我有:

In my initBinder I have:

@InitBinder
public void initBinder(WebDataBinder binder) {
  ...
  binder.registerCustomEditor(List.class, "things", new PropertyEditorSupport() {
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
       List<MyThing> things = new ArrayList<MyThings>;

       // fill things array with data from text
       ...


       // On that stage things value is correct!
       super.setValue(things);
    }
  });
}

和在我的控制器请求方式:

And in my controller request method:

@RequestMapping({"save"})
public ModelAndView doSaveMyDTO(@ModelAttribute MyDTO myDTO) {
  // very strange myDTO comes here=(
}

现在的问题是,当我在 registerCustomEditor 工作人员的事情阵列就可以了。

The problem is that while I'm in registerCustomEditor staff the things array is ok.

但是,当我到了 doSaveMyDTO 法 - MyDTO.things 看起来像实际的一个元素数组的数组值:

But when I get to the doSaveMyDTO method - MyDTO.things looks like Array of one element arrays of actual values:

预计(在initBinder的东西):

Expected (things in initBinder):

[value1, value2, value3]

获取doSaveMyDTO(myDTO.getThings()):

Get in doSaveMyDTO (myDTO.getThings()):

[[value1], [value2], [value3]]

为什么呢?请解释...

Why? Please explain...

推荐答案

如果该请求是正确形成(东西= V1和放大器;东西= v2和放大器;东西= V3 东西= V1,V2,V3 ),春天的内置转换器应适当将其转换为列表 - 无需注册自己的。

If the request is correctly formed (things=v1&things=v2&things=v3 or things=v1,v2,v3), spring's built-in converters should properly convert it to a List - no need to register your own.

如果您输入JSON,那么你需要 @RequestBody 而不是 @ModelAttribute

If your input is JSON, then you'd need @RequestBody instead of @ModelAttribute

这篇关于Spring MVC的绑定:如何绑定的ArrayList&LT; ...&GT ;?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!

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