将空edittext值设置为零

var input = document.getElementById("edittextId");
if (input.value === "") {
    input.value = "0";
}

<input type="text" id="edittextId" placeholder="0">

@RequestMapping(value = "/example", method = RequestMethod.POST)
public String example(@RequestParam(value = "edittext", required = false) String editText) {
    if (editText == null || editText.isEmpty()) {
        editText = "0";
    }
    // 其他处理逻辑
    return "success";
}

def example(request):
    edittext = request.POST.get("edittext", "")
    if not edittext:
        edittext = "0"
    # 其他处理逻辑
    return HttpResponse("success")