Spring MVC Binding: How to bind ArrayList<...>?
I've got a DTO (bean) with ArrayList
field:
public MyDTO {
...
private List<MyThing> things;
...
... getters, setters and so on
}
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 IllegalArgume开发者_Go百科ntException {
List<MyThing> things = new ArrayList<MyThings>;
// fill things array with data from text
...
// On that stage things value is correct!
super.setValue(things);
}
});
}
And in my controller request method:
@RequestMapping({"save"})
public ModelAndView doSaveMyDTO(@ModelAttribute MyDTO myDTO) {
// very strange myDTO comes here=(
}
The problem is that while I'm in registerCustomEditor
staff the things
array is ok.
But when I get to the doSaveMyDTO
method - MyDTO.things
looks like Array of one element arrays of actual values:
Expected (things in initBinder):
[value1, value2, value3]
Get in doSaveMyDTO (myDTO.getThings()):
[[value1], [value2], [value3]]
Why? Please explain...
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.
If your input is JSON, then you'd need @RequestBody
instead of @ModelAttribute
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