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String avatar = teacherEntity.getAvatar();
if(!StringUtils.isEmpty(avatar)){
List<JSONObject> list = JSONObject.parseArray(avatar, JSONObject.class);
String ava = (String)list.get(0).get("filePath");
teacherEntity.setAvatar(ava);
jsonarray:
[{
"fileName":"xxx","fileSize":xxx,"filePath":"xxx","fileExt":"xxxf"}]
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