Spring MVC @RequestParam一个对象列表 [英] Spring MVC @RequestParam a list of objects

问题描述

我想创建一个页面，其中一个人看到一个用户列表，并且每个人旁边都有一个复选框，该人可以点击该复选框将其删除。

<在我使用REST API的MVC中，我想向REST API发送一个用户对象列表。

@RequestParam 注释可以支持吗？

例如：

  @RequestMapping（method = RequestMethod.DELETE，value =/ delete）
 public @ResponseBody整数删除（
 @RequestParam（用户）列表<用户>列表）{
整数deleteCount = 0; 
 for（User u：list）{
 if（u！= null）{
 repo.delete（u）; 
 ++ deleteCount; 
} 
} 
 return deleteCount; 
} 
  

在MVC客户端中，网址为：

 列表list = new ArrayList< User>（）; 
 .... 
 String url =http：// restapi / delete？users =+ list; 
  

解决方案

请求参数是字符串到字符串的多重映射。您不能将复杂对象作为请求参数传递。

但如果您只是传递应该有效的用户名 - 请参阅如何使用spring mvc使用@RequestParam捕获多个参数？

@RequestParam（users）List< String> list

但我认为最好只使用请求体传递信息。

I want to create a page where a person sees a list of users and there are check boxes next to each of them that the person can click to have them deleted.

In my MVC that consumes a REST API, I want to send a List of User objects to the REST API.

Can the @RequestParam annotation support that?

For example:

@RequestMapping(method = RequestMethod.DELETE, value = "/delete")
    public @ResponseBody Integer delete(
            @RequestParam("users") List<Users> list) {
        Integer deleteCount = 0;
        for (User u : list) {
            if (u != null) {
                repo.delete(u);
                ++deleteCount;
            }
        }
        return deleteCount;
    }

In the MVC client, the url would be:

List list = new ArrayList<User>();
....
String url = "http://restapi/delete?users=" + list;

解决方案

Request parameters are a Multimap of String to String. You cannot pass a complex object as request param.

But if you just pass the username that should work - see how to capture multiple parameters using @RequestParam using spring mvc?

@RequestParam("users") List<String> list

But I think it would be better to just use the request body to pass information.

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