今天實訓，springboot接受vue axios傳來的json字符串對象，想將其轉換為Java POJO對象，使用ObjectMapper方式如下：

@RequestMapping(value = "/insertSong", method = RequestMethod.POST)public String insertSong(@RequestBody String songStr) throws JsonProcessingException {ObjectMapper mapper = new ObjectMapper();Song song = mapper.readValue(songStr, Song.class);int count = musicWebService.insertSong(song);return count != 0 ? "Success" : "FAIL";}

報錯：
com.fasterxml.jackson.databind.exc.MismatchedInputException:
Cannot construct instance of com.hui.domain.Song (although at least one Creator exists):

no String-argument constructor/factory method to deserialize from String value

(’{“mid”:"",“musicName”:“1”,“musicSinger”:“1”,“musicLyric”:"",“musicType”:"",“musicImg”:"",“musicUrlID”:“1”,“musicCreationTime”:"",“musicPlayTimes”:0,“musicScore”:10,“musicComment”:“評論”}’)

但是明明我的Song對象有全參構造和無參構造方法

解決:

在POJO對象里加入如下構造方法：

public Song(String json) throws JsonProcessingException {Song song = new ObjectMapper().readValue(json, Song.class);this.mid = song.getMid();this.musicName = song.getMusicName();this.musicSinger = song.getMusicSinger();this.musicLyric = song.getMusicLyric();this.musicType = song.getMusicType();this.musicImg = song.getMusicImg();this.musicUrlID = song.getMusicUrlID();this.musicCreationTime = song.getMusicCreationTime();this.musicPlayTimes = song.getMusicPlayTimes();this.musicScore = song.getMusicScore();this.musicComment = song.getMusicComment();}

參考：
https://blog.csdn.net/qq_30162239/article/details/86647164

總結

以上是生活随笔為你收集整理的Json字符串转对象，使用ObjectMapper方式报错：no String-argument constructor/factory method的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。