首先推荐一个神器，JSON在线解析及格式化验证 - JSON.cn 里面的“JSON在线解析”和“JSON生成JAVA实体”两个功能，前几天可是帮了我大忙了。
前几天写一个功能，在这个功能中前端传过来的JSON十分复杂，示例如：
{
"DispositionNotificationListObject":{
"DispositionNotificationObject":[
{
"AlarmDetailReason":"701",
"AlarmLevel":3,
"AlarmLevelColor":"#ffffff00",
"AlarmLevelDesc":"ordinary",
"AlarmLevelName":"",
"AlarmLevelValue":50,
"AlarmLinkageInfo":{
"actionList":[
{
"actionBranch":0,
"actionType":4,
"devList":[
{
"devCode":"02079188091993080101"
}
],
"globalParam":"99"
}
]
},
"AlarmMatch":0,
"AlarmRuleType":99,
"AnalysisTaskID":"",
"BehaviorAnalysisObject":{
"BehaviorId":"10077",
"DeviceID":"02079188091993080101",
"ObjectID":"3553028120241925498",
"OccuredTime":"20220606172725",
"RuleType":1,
"SubImageList":{
"SubImageInfoObject":[
{
"Data":"",
"DeviceID":"02079188091993080101",
"EventSort":12,
"FileFormat":"Jpeg",
"Height":1080,
"ImageID":"60606812413199",
"ShotTime":"20220606172725",
"StoragePath":"",
"Type":"14",
"Width":1920
}
]
},
"metaData":{
"attributes":{
"alarmFlag":1,
"detectObject":{
"objPositionInfos":[
[
{
"bottom":186,
"left":1505,
"right":1532,
"top":123,
"type":98
}
]
],
"posNum":1
},
"line":{
"lineInfos":[
{
"direct":0,
"endPoint":{
"x":1538,
"y":1076
},
"startPoint":{
"x":1538,
"y":82
},
"type":1
}
],
"lineNum":1
},
"ruleId":0
}
}
},
"DispositionCategory":"1086",
"DispositionID":"40288be480e15c2022060617272557355",
"DispositionTargetID":"",
"FileID":"0",
"FileStrID":"",
"FromRedGroup":0,
"GroupID":"0",
"GroupStrID":"",
"IsUserDefined":0,
"NotificationID":"40288be480e15c2022060617272557355",
"NotificationIDEx":"2022060617272557355",
"SourceType":4,
"SubscribeID":"40288be480e15c130180fa05f9bb662c",
"SuspectID":"0",
"SuspectStrID":"",
"TargetID":"0",
"TargetStrID":"",
"TaskUser":"",
"Title":"biuu",
"TriggerTime":"20220606172725315"
}
]
}
}可以发现，推过来的这个JSON不仅复杂，而且有一点十分让人在意，那就是它的属性值首字母基本上都是大写。这也就使得通过“JSON生成JAVA实体”获得的Java无法被直接使用。
有两种解决方法
（1）通过 JSONObject 。 在接收前端传来的JSON数据时，以String的形式接收，然后利用JSONObject 将说需要的的数据从一大串JSON中获取出来。（不同包的 JSONObject 使用方法不同，但都能实现相同的效果 ）
示例：
//先把String对象转换成json对象
JSONObject object1= new JSONObject(bodyStr);
JSONObject DispositionNotificationListObject = object1.getJSONObject("DispositionNotificationListObject");
JSONArray DispositionNotificationObjectArr = DispositionNotificationListObject.getJSONArray("DispositionNotificationObject");
for (int i = 0; i < DispositionNotificationObjectArr.length(); i++) {
JSONObject DispositionNotificationObject = DispositionNotificationObjectArr.getJSONObject(i);
alarmLevelValue = ""+DispositionNotificationObject.getInt("AlarmLevelValue");
alarmLevelColor = DispositionNotificationObject.getString("AlarmLevelColor");
alarmType = DispositionNotificationObject.getString("AlarmDetailReason");
alarmEventId = DispositionNotificationObject.getString("NotificationID");
JSONObject BehaviorAnalysisObject = DispositionNotificationObject.getJSONObject("BehaviorAnalysisObject");
occurTime = BehaviorAnalysisObject.getString("OccuredTime");
alarmInCode = BehaviorAnalysisObject.getString("DeviceID");
log.warn("开始获取picData");
JSONObject SubImageList = BehaviorAnalysisObject.getJSONObject("SubImageList");
JSONArray SubImageInfoObjectArr = SubImageList.getJSONArray("SubImageInfoObject");
for (int j = 0; j < SubImageInfoObjectArr.length(); j++) {
JSONObject SubImageInfoObject = SubImageInfoObjectArr.getJSONObject(j);
picData = SubImageInfoObject.getString("Data");
// log.warn("picData");
}
// log.warn("获取picData结束"+picData);
}
（2）通过 @JsonProperty( value ="Name" ) 指定属性名，来避免首字母大写带来的错误
若不生效，可以试着同时再加上一个 @JSONField(name = "SubscribeID")
import com.alibaba.fastjson.annotation.JSONField;
import com.fasterxml.jackson.annotation.JsonProperty;@JsonProperty注解的使用 - Mop猎人 - 博客园
@JSONField的一些使用基础_狂奔的蜗牛Evan的博客-CSDN博客_jsonfield
示例：
@JSONField(name = "SubscribeID")
@JsonProperty( value ="SubscribeID" )
private String SubscribeID;postman传到后端的数据：、
