Question

我正在使用如下的JsonAarray：

JsonARray ProfileTabs = [{"totalItemCount":0,"label":"Updates","name":"update"},{"totalItemCount":2,"label":"Members","url":"groups\/member\/list\/129","urlParams":[],"name":"members"},{"totalItemCount":5,"label":"Photos","url":"groups\/photo\/list","urlParams":{"group_id":129},"name":"photos"}]

与上面的JsonArray一样，我在索引0,1,2处有3个JsonObject。

现在我想在索引1的JsonArray中添加一个新的JsonObject。

所以，我创建了一个新的JsonObject，如下所示：

JSONObject InfoTabJsonObject = new JSONObject();
                    InfoTabJsonObject.put("totalItemCount", 0);
                    InfoTabJsonObject.put("label", "Info");
                    InfoTabJsonObject.put("name", "info");
                    mProfileTabs.put(1, InfoTabJsonObject);

并将此JsonObject添加到索引1处的JsonArray，但在添加此JsonObject之后，它将使用新的JsonObject替换原始的第一个索引的JsonObject。

如何才能使索引保持正常，意味着新索引将被添加到第一个索引而另一个将调整其索引。

请在这里帮助我，谢谢你。

Answer 1

请查看以下代码，使用org.json.simple.JSONArray和org.json.simple.JSONObject。

    JSONObject jsonObj1 = new JSONObject();
    jsonObj1.put("totalItemCount", 0);
    jsonObj1.put("label", "Updates");
    jsonObj1.put("name", "update");

    JSONObject jsonObj2 = new JSONObject();
    jsonObj2.put("totalItemCount", 2);
    jsonObj2.put("label", "Members");
    jsonObj2.put("url", "groups/member/list/129");
    JSONArray temp = new JSONArray();
    jsonObj2.put("urlParams", temp);
    jsonObj2.put("name", "members");

    JSONObject jsonObj3 = new JSONObject();
    jsonObj3.put("totalItemCount", 5);
    jsonObj3.put("label", "Photos");
    jsonObj3.put("url", "groups/photo/list");
    JSONObject temp1 = new JSONObject();
    temp1.put("group_id", 129);
    jsonObj3.put("urlParams", temp1);
    jsonObj3.put("name", "photos");

    JSONArray array=new JSONArray();
    array.add(jsonObj1); //adding objects into array 
    array.add(jsonObj2);
    array.add(jsonObj3);
    try {  

        // Writing to a file  
        System.out.println("Before addition of new object into array!");
        File file=new File("test1.json");  
        file.createNewFile();  
        FileWriter fileWriter = new FileWriter(file);  
        fileWriter.write(array.toJSONString());  
        fileWriter.flush();  
        fileWriter.close();  

    } catch (IOException e) {  
        e.printStackTrace();  
    }

    JSONObject InfoTabJsonObject = new JSONObject();
    InfoTabJsonObject.put("totalItemCount", 0); //adding objects into array
    InfoTabJsonObject.put("label", "Info");
    InfoTabJsonObject.put("name", "info");
    array.add(1, InfoTabJsonObject);
    System.out.println("After addition of new object into array!");
    try {  

        // Writing to a file  
        File file=new File("test.json");  
        file.createNewFile();  
        FileWriter fileWriter = new FileWriter(file);  
        fileWriter.write(array.toJSONString());  
        fileWriter.flush();  
        fileWriter.close();  

    } catch (IOException e) {  
        e.printStackTrace();  
    }

test1.json 在数组中添加新对象之前的原始文件。

[
{
    "name": "update",
    "label": "Updates",
    "totalItemCount": 0
},
{
    "urlParams": [],
    "name": "members",
    "label": "Members",
    "url": "groups\/member\/list\/129",
    "totalItemCount": 2
},
{
    "urlParams": {
        "group_id": 129
    },
    "name": "photos",
    "label": "Photos",
    "url": "groups\/photo\/list",
    "totalItemCount": 5
}
]

test.json 在数组中添加新对象后更新的。

[
{
    "name": "update",
    "label": "Updates",
    "totalItemCount": 0
},
{
    "name": "info",
    "label": "Info",
    "totalItemCount": 0
},
{
    "urlParams": [],
    "name": "members",
    "label": "Members",
    "url": "groups\/member\/list\/129",
    "totalItemCount": 2
},
{
    "urlParams": {
        "group_id": 129
    },
    "name": "photos",
    "label": "Photos",
    "url": "groups\/photo\/list",
    "totalItemCount": 5
}
]

如何在JsonArray中的某个随机索引

1 个答案: