如果我得到了不確定的行 JSON 數據。我應該如何設置我的班級？這是我現在的班級public class ChatMessage {private Map<String, String> message = new HashMap<>();@JsonAnyGetterpublic Map<String, String> any(){ return this.message;}public Map<String, String> getMessage() { return this.message;}@JsonAnySetterpublic void setMessage(String key, String value) { message.put(key, value);}@Overridepublic String toString() { return "Message [message=" + message + "]";}}這是我從 js 發送的 json{"type":"message","user":"james","to":"","message":"Hi every"}我現在有錯誤org.springframework.messaging.converter.MessageConversionException: Could not read JSON: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Welcome james join the room')at [Source: (byte[])" . {"type":"message","user":"james","to":"","message":"Welcome james join the room"}"; line: 1, column: 52] (through reference chain: chat.model.ChatMessage["message"]); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('Welcome james join the room')at [Source: (byte[])" . {"type":"message","user":"james","to":"","message":"Welcome james join the room"}"; line: 1, column: 52] (through reference chain: chat.model.ChatMessage["message"])因為我的 json 會像{"type":"message", "user":"james", "to":"", "message":"Welcome james join the room", "xxx":"xxxxxxxxxxxxx"}或者{"type":"message", "user":"james", "to":"", "message":"Welcome james join the room", "yyy":"xxxxxxxxxxxxx"}我應該如何設置我的班級？謝謝
1 回答
jeck貓
TA貢獻1909條經驗 獲得超7個贊
重命名messagejson 中的字段或messagePOJO 中的字段。根據您的 POJO 結構，jackson 試圖反序列化"message":"Hi every"到您的 POJO 中的消息字段，并且無法從中創建 Map（因為它只是一個字符串）。
您的代碼將使用以下 json：
{"type":"message","user":"james","to":"","json-message":"Hi every"}
或者
以下POJO：
public class ChatMessage {
private Map<String, String> map = new HashMap<>();
@JsonAnyGetter
public Map<String, String> any(){
return this.map;
}
public Map<String, String> getMap() {
return this.map;
}
@JsonAnySetter
public void setMap(String key, String value) {
map.put(key, value);
}
@Override
public String toString() {
return "Map [map=" + map + "]";
}
}
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