java - 将 JSON 数组发布到 Spring Boot RestController 中

Question

我正在发布这样的内容:

{
  "stuff": [
    {
      "thingId": 1,
      "thingNumber": "abc",
      "countryCode": "ZA"
    },
    {
      "thingId": 2,
      "thingNumber": "xyz",
      "countryCode": "US"
    }
  ]
}

我可以按如下方式检索 Controller 中的数据:

@RequestMapping(value = "/stuffs", method = RequestMethod.POST)
public String invoices(@RequestBody Map<String, List <Stuff>> stuffs) {

    return "Hooray";
}

我真正想做的只是将一个东西列表传递到 Controller 中；即:

@RequestMapping(value = "/stuffs", method = RequestMethod.POST)
public String invoices(@RequestBody List <Stuff> stuffs) {

    return "I'm sad that this won't work.";
}

然而， jackson 不喜欢这样。我得到的错误如下:

Could not read JSON document: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token\n at [Source: java.io.PushbackInputStream@2a30a2f4; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token\n at [Source: java.io.PushbackInputStream@2a30a2f4; line: 1, column: 1]

我无法发送以下内容(因为它不是有效的 JSON):

    {
      [
        {
          "thingId": 1,
          "thingNumber": "abc",
          "countryCode": "ZA"
        },
        {
          "thingId": 2,
          "thingNumber": "xyz",
          "countryCode": "US"
        }
      ]
    }

我确信这很简单，但我无法从 StackOverflow 和 Google 搜索中提取答案。

如有任何帮助，我们将不胜感激! :)

Answer 1

您只需发送不带大括号的内容

   [
    {
      "thingId": 1,
      "thingNumber": "abc",
      "countryCode": "ZA"
    },
    {
      "thingId": 2,
      "thingNumber": "xyz",
      "countryCode": "US"
    }
  ]

在你的 Controller 中，当你告诉 Jackson 它应该解析一个列表时，它应该是一个列表，而不是包含列表的对象