java - 读取 JSON 时出现 400 错误

Question

我正在发送以下 JSON:

{
  "sqId": "10009",
  "pCode": [
    {
      "key": [
        [
          1,
          0,
          1
        ]
      ]
    }
  ],
  "hdId": "87",
  "sType": [
    {
      "key": [
        {
          "id": "id_1",
          "q": "1",
          "pCode": "pCode_1",
          "Type": "T_1",
          "Level": "f"
        }
      ]
    }
  ]
}

它与以下 POJO 映射:

public class Pinfo {

   protected String sqId;
   protected String hdId;
   protected Map<String, Integer> pCode;
   protected Map<String, List<sType>> sType;

   public Map<String, List<sType>> getsType() {
      return sType;
   }

   public void setsType(Map<String, List<sType>> sType) {
      this.sType = sType;
   }

   public String getsqId() {
      return sqId;
   }

   public void setsqId(String sqId) {
      this.sqId = sqId;
   }

   public Map<String, Integer> getpCode() {
      return pCode;
   }

   public void setpCode(Map<String, Integer> pCode) {
      this.pCode = pCode;
   }

   public String gethdId() {
      return hdId;
   }

   public void sethdId(String hdId) {
      this.hdId = hdId;
   }

}

现在使用以下代码读取 JSON:

Map<String, Integer> pMap = (Map<String, Integer>) PinfoObj.getpCode(); //Getting Error 
logger.debug("### pMap ###"+pMap.values());

但我收到错误:

"Could not read document: Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token\n at [Source: java.io.PushbackInputStream@5ed7c090; line: 2, column: 40] (through reference chain: com.ve.pg.dto.Pinfo[\"pCode\"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token\n at [Source: java.io.PushbackInputStream@5ed7c090; line: 2, column: 40] (through reference chain: com.vonage.pg.dto.Pinfo[\"pCode\"])"

目前无法弄清楚我缺少什么，任何想法或提示都会很棒。

Answer 1

错误:

Could not read document: Can not deserialize instance of
       java.util.LinkedHashMap out of START_ARRAY token

告诉您“我遇到了 START_ARRAY token ( [ )，但您要求我反序列化为 map ，因此我希望找到 START_OBJECT token ( { )”

你的错误是尝试反序列化类似的东西

[{
  "key": [
    [
      1,
      0,
      1
    ]
  ]
}]

至 Map<String, Integer> ，而实际上是 List<Map<String, List<List<Integer>>>> 。您应该更改 JSON 的结构，或更改要反序列化的类型。

同样的错误应该被修复为 sType .