没有@RequestBody的Spring @RequestMapping方法

Question

在 Spring Boot Controller 方法中，我如何获取 POST 的主体？我见过的所有示例都使用@RequestBody。如何在不使用@RequestBody 的情况下获取正文？

我正在编写一个处理 Slack 事件的方法。当 Slack 发布一个事件时，正文是 JSON 格式，并且通常包含一个“用户”键。根据事件的类型，“user”的值可以是字符串或对象。因此，我无法创建单个类并编写

@RequestMapping(path = "/slackRequest", method = RequestMethod.POST)
    public String handleSlackRequest(@RequestBody final SlackRequest slackRequest)

答案：实现@ChiDov建议的方法，解决方案是保留@RequestBody，导入

import com.fasterxml.jackson.annotation.JsonSetter;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

定义用户字段（如果它是一个简单的字符串值，则定义一个新字段来存储“用户”）

@OneToOne
private SlackEventUser user;
private String slackUserId;

并将其Setter方法定义为

@JsonSetter("user")
public void setUser(JsonNode userNode) {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    if (userNode.isObject()) {
        SlackEventUser slackEventUser = mapper.convertValue(userNode, SlackEventUser.class);
        this.user = slackEventUser;
    } else {
        String userString = mapper.convertValue(userNode, String.class);
        this.slackUserId = userString;
        this.user = null;
    }
}

Answer 1

更新：我会让你的 DTO 像这样：

Class SlackRequest{
    ...
    private String eventType;
    private JsonNode user;
    ...
    public String getUser(){
        return user.asText();
    }
}

在控制器中：

@RequestMapping(path = "/slackRequest", method = RequestMethod.POST)
    public String handleSlackRequest(@RequestBody final SlackRequest slackRequest){
    if(slackRequest.getEventType == "objectEvent"){
      SomeObject user = mapper.convertValue(slackRequest.getUser(), SomeObject.class);
      // do something with the object
    }else{
     // do something with the user string
   }
}

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