我可以对 Post 请求使用 @Requestparam 注释吗? [英] Can I use @Requestparam annotation for a Post request?
问题描述
我有这个控制器方法:
@PostMapping(
value = "/createleave",
params = {"start","end","hours","username"})
public void createLeave(@RequestParam(value = "start") String start,
@RequestParam(value = "end") String end,
@RequestParam(value = "hours") String hours,
@RequestParam(value = "username") String username){
System.out.println("Entering createLeave " + start + " " + end + " " + hours + " " + username);
LeaveQuery newLeaveQuery = new LeaveQuery();
Account account = accountRepository.findByUsername(username);
newLeaveQuery.setAccount(account);
newLeaveQuery.setStartDate(new Date(Long.parseLong(start)));
newLeaveQuery.setEndDate(new Date(Long.parseLong(end)));
newLeaveQuery.setTotalHours(Integer.parseInt(hours));
leaveQueryRepository.save(newLeaveQuery);
}
但是，当我向此端点发送发布请求时，我得到以下内容
However when I send a post request to this endpoint I get the following
"{"timestamp":1511444885321,"status":400,"error":"Bad Request","exception":"org.springframework.web.bind.UnsatisfiedServletRequestParameterException","message":"Parameter conditions "start, end, hours, username" not met for actual request parameters: ","path":"/api/createleave"}"
当我从 @PostMapping 注释中删除 params 参数时，我得到一个更一般的错误，它会说它找不到第一个必需的参数(开始)，而它实际上是一起发送的与参数结束，小时和用户名.
When I remove the params argument from the @PostMapping annotation I get a more general error, it will say that it cannot find the first required parameter (start), while it really is being send together with the parameters end, hours and username.
我在这篇文章中读到 @RequestParam 只能用于获取方法，但是如果我删除 @RequestParam 并坚持使用 @RequestParam 的 params 参数code>@PostMapping 注释它仍然不起作用.我知道我可以使用 @RequestBody 但我不想只为这 4 个参数创建一个类.谁能告诉我如何使这项工作?
I've read in this post that @RequestParam can only be used for get methods, but if I remove @RequestParam and stick with the params argument of the @PostMapping annotation it still doesn't work. I know I can use @RequestBody but I do not want to make a class just for those 4 parameters. Can anyone tell me how I can make this work?
谢谢
我在这里阅读 https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestMapping.html#params--参数 params 并不完全是我认为的那样.它似乎被用作条件.如果一组参数匹配一个值，则端点控制器方法将被激活.
I'm reading here https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestMapping.html#params-- that the argument params isn't exactly what I thought it was. It seems to be used as a condition. If a set of parameters match a value then the endpoint controller method will be activated.
推荐答案
您的要求从根本上是错误的.POST 请求在正文有效负载中发送数据，该有效负载通过 @RequestBody 映射.@RequestParam 用于通过/url?start=foo等URL参数映射数据.您要做的是使用 @RequestParam 来完成 @RequestBody 的工作.
What you are asking for is fundamentally wrong. POST requests sends data in a body payload, which is mapped via @RequestBody. @RequestParam is used to map data through the URL parameters such as /url?start=foo. What you are trying to do is use @RequestParam to do the job of @RequestBody.
- 介绍一个 DTO 类.这是最优选和最干净的方法.
- 如果你真的想避免创建一个类，你可以使用
@RequestBody Map.请务必在您的请求标头中包含'Content-Type': 'application/json'. - 如果您确实想使用
@RequestParam，请改用 GET 请求并通过 URL 参数发送您的数据.
- Introduce a DTO class. It is the most preferred and clean method.
- If you really want to avoid creating a class, you can use
@RequestBody Map<String, String> payload. Be sure to include'Content-Type': 'application/json'in your request header. - If you really want to use
@RequestParam, use a GET request instead and send your data via URL parameters.
- 引入一个 DTO 类并将其与注释
@ModelAttribute一起使用. - 如果将表单数据转成JSON，可以使用
@RequestBody Map.为此，请参阅此答案.
- Introduce a DTO class and use it with annotation
@ModelAttribute. - If you transform the form data into JSON, you can use
@RequestBody Map<String, String> payload. To do this, please see this answer.
无法将表单数据编码数据直接映射到 Map.
It is not possible to map form data encoded data directly to a Map<String, String>.
这篇关于我可以对 Post 请求使用 @Requestparam 注释吗?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！
