为什么 Google 协议缓冲消息不会自动绑定到 Spring MVC 控制器中？
我有一个标准表单控制器来更新持久保存的谷歌协议缓冲区消息对象。对于表单，我将 Message.Builder 添加到 ModelMap，以便我可以访问 setter 消息。但是，我在表单中更改的值不会自动绑定到 Builder 对象。我不明白为什么这不起作用...我确实在@SessionAttributes 中有消息。下面是我的实现的总结版本。
@RequestMapping(method = RequestMethod.GET)
public String setup(ModelMap modelMap) {
Message.Builder builder = Message.Builder.newBuilder(serviceLayer.getMessage(someId));
modelMap.addAttribute("message", builder);
return "form";
}
@RequestMapping(method = RequestMethod.POST)
public String process(@ModelAttribute("message") Message message) {
serviceLayer.saveMessage(message.build());
return "done";
}
I have a standard form controller to update a google protocol buffers message object that gets persisted. For the form I add the Message.Builder to the ModelMap so that I have access to the setter message. However, the values I change in the form are not automatically bound to the Builder object. I can not figure out why that doesn't work... I do have the message in the @SessionAttributes. Below is a summerized version of my implementation.
@RequestMapping(method = RequestMethod.GET)
public String setup(ModelMap modelMap) {
Message.Builder builder = Message.Builder.newBuilder(serviceLayer.getMessage(someId));
modelMap.addAttribute("message", builder);
return "form";
}
@RequestMapping(method = RequestMethod.POST)
public String process(@ModelAttribute("message") Message message) {
serviceLayer.saveMessage(message.build());
return "done";
}
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结果嵌入 getter 方法的消息即使从 Builder 中也只返回一个不可变的对象。相反，我必须使用 HttpServletRequest 自下而上重建消息。
Turns out Messages embedded the getter methods only return an immutable object even from the Builder. Instead I had to reconstruct the Message from bottom up using the HttpServletRequest.