如何使用Java删除JSONArray元素 [英] How to remove JSONArray element using Java
问题描述
My JsonArray是
[{
Id:null,
Name: 一项新任务,
StartDate:2010-02-03T05:30:00,
EndDate:2010-02-04T05:30:00,
Duration:1,
DurationUnit:d,
PercentDone:0,
ManuallyScheduled:false,
Priority:1,
parentId:8,
index:0,
depth:3,
checked:null},{
Id:null,
Name:New task,
StartDate:2010-02-04T05:30:00,
EndDate:2010-02-04T05:30: 00,
Duration:0,
DurationUnit:d,
PercentDone:0,
ManuallyScheduled:false,
优先级:1,
parentId:8,
index:1,
depth:3,
checked:null}]
现在从这个JsonArray中,我想删除Id,ManuallyScheduled,checked,
我尝试使用 jsonArray.remove(1)
以及 jsonArray.discard(Id)
in JAVA。
但没有任何反应。什么是我做错了删除数组项目?
我使用JAVA作为我的技术。
方案你在那里有一个对象数组。因此,您必须遍历数组并从每个对象中移除必要的数据,例如
for(int i = 0,len = jsonArr.length(); i< len; i ++){
JSONObject obj = jsonArr.getJSONObject(i);
//做你的移除
obj.remove(id);
//等等
}
我假设您正在使用 org.json.JSONObject
和 org.json.JSONArray
在这里,但是无论JSON处理库如何,如果你想转换像 [{id:215},{id:216}] / code>到
[215,216]
你可以这样:
JSONArray intArr = new JSONArray();
for(int i = 0,len = objArr.length(); i< len; i ++){
intArr.put(objArr.getJSONObject(i).getInt(id));
}
My JsonArray is
[{
"Id": null,
"Name": "One New task",
"StartDate": "2010-02-03T05:30:00",
"EndDate": "2010-02-04T05:30:00",
"Duration": 1,
"DurationUnit": "d",
"PercentDone": 0,
"ManuallyScheduled": false,
"Priority": 1,
"parentId": 8,
"index": 0,
"depth": 3,
"checked": null },{
"Id": null,
"Name": "New task",
"StartDate": "2010-02-04T05:30:00",
"EndDate": "2010-02-04T05:30:00",
"Duration": 0,
"DurationUnit": "d",
"PercentDone": 0,
"ManuallyScheduled": false,
"Priority": 1,
"parentId": 8,
"index": 1,
"depth": 3,
"checked": null }]
Now from this JsonArray I want to remove Id, ManuallyScheduled, checked,
I tried using jsonArray.remove(1)
and also jsonArray.discard("Id")
in JAVA.
but nothing happens. what am I doing wrong to remove array items?
I am using JAVA as my technology.
What you have there is an array of objects. Therefore you'll have to loop through the array and remove the necessary data from each object, e.g.
for (int i = 0, len = jsonArr.length(); i < len; i++) {
JSONObject obj = jsonArr.getJSONObject(i);
// Do your removals
obj.remove("id");
// etc.
}
I've assumed you're using org.json.JSONObject
and org.json.JSONArray
here, but the principal remains the same whatever JSON processing library you're using.
If you wanted to convert something like [{"id":215},{"id":216}]
to [215,216]
you could so something like:
JSONArray intArr = new JSONArray();
for (int i = 0, len = objArr.length(); i < len; i++) {
intArr.put(objArr.getJSONObject(i).getInt("id"));
}
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