Question

我想从JSONArray中提取值。 JSONArray有N个行和列。

        ObjectMapper mapper = new ObjectMapper();
        DynamicForm dynamicForm = new DynamicForm();
        dynamicForm = dynamicForm.bindFromRequest();
        Dynamic dynamic = dynamicForm.get(); 
        //List<OneModel> list = new ArrayList<OneModel>();
        //List iterate=new ArrayList();

        String data = dynamic.getData().get("content").toString();
        try {
            JSONArray jsonArray = new JSONArray(data);
            for (int i = 0; i < jsonArray.length(); i++) {
                System.out.println(jsonArray.get(i));
        } }catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

结果如下。

["1001432","05-KALENJI-P1229","KALENJI","2","2014-11-09 09:37:14.379482",""],
["1001432","05-KALENJI-P1228","KALENJI","1","2014-11-09 09:37:14.379482",""],
["1001432","05-KALENJI-P1227","KALENJI","5","2014-11-09 09:37:14.379482",""]

我想逐个提取值并将其分配给变量。例如1001432,05-KALENJI-P1229，KALENJI，2,2014-11-09 09：37：14.379482。这样我就可以处理每个值。请任何人帮助我

Answer 1

您可以使用以下代码：

//将你的json放在字符串变量“data”

中

JSONArray jsonArray=new JSONArray(data);
            if(jsonArray!=null && jsonArray.length()>0){
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONArray childJsonArray=jsonArray.optJSONArray(i);
                    if(childJsonArray!=null && childJsonArray.length()>0){
                        for (int j = 0; j < childJsonArray.length(); j++) {
                            System.out.println(childJsonArray.optString(j));
                        }
                    }
                }
            }

Answer 2

你可以通过循环迭代数组并得到你喜欢的对象：

 JsonObject home = array.getJsonObject(index); //use index to iterate
 String num = home.getString("number"); //make number a static final variable

“number”是值的名称，最初放在

中

.add("number", someString);

电贺。

编辑：我建议您阅读文档：Oracle Doc和this, too.

Answer 3

看起来JSON数组是2维的。试试这个：

JSONArray outerArray = new JSONArray(data);
for (int i = 0; i < outerArray.length(); i++) {
    JSONArray innerArray = outerArray.getJSONArray(i);

    for (int j = 0; j < outerArray.length(); j++) {
        System.out.println(innerArray.get(j));
    }
}

如何在java中迭代JSONArray

3 个答案: