Java返回JSONArray [英] Java return JSONArray

问题描述

我正在尝试从java中的Map创建一个jsonarray。我将它传递给javascript变量。但我不知道为什么mac和状态是空白的，任何帮助都非常感激。

I'm trying to create a jsonarray from a Map in java. I'm passing it in to a javascript variable. But i don't know why the mac and status are blank, any help much appreciated.

我需要什么：

[{"12345":{"mac":"FFFFFFFF", "status":"ON"}]

我使用当前代码获得的信息：

What i am getting with my current code:

[{"12345":{}]

这是我的代码，

public class Details {

public JSONArray getResult() {
    return JSONArray.fromObject(this.det);
}
public Map det = new HashMap();

public results() {
   ResultSet rs;
   det.put(rs.getString(1), new NodeDetails(rs.getString(2), rs.getString(3));
}
class NodeDetails {
    public final String MAC;
    public final String status;

    public NodeDetails(final String ma,final String st) {
        this.MAC = ma;
        this.status = st;
    }
  }
}

推荐答案

您对任何库有任何限制吗？我的意思是您使用的是 http://org.json,JSON库中的JSON库或哪个库？

Do you have any limitation on any library? I mean are you using JSON library from http://org.json or which library?

以下是我尝试使用来自 http：//org.json ：

Following is the code that I've tried using JSON library from http://org.json:

public class Test {

    public static class NodeDetails {
        public final String MAC;
        public final String status;

        public NodeDetails(final String ma, final String st) {
            this.MAC = ma;
            this.status = st;
        }
    }

    public static void main(String[] args) throws Exception {
        Map<String, NodeDetails> map = new HashMap<String, NodeDetails>();
        // do something with you ResultSet? and populate the map ;)
        map.put("12345", new NodeDetails("FFFFFF", "ON"));

        JSONObject jsonMap = new JSONObject();
        for (Map.Entry<String, NodeDetails> entry : map.entrySet()) {
            JSONObject object = new JSONObject();
            object.put(entry.getValue().MAC, entry.getValue().status);
            jsonMap.put(entry.getKey(), object);
        }

        JSONArray jsonArray = new JSONArray();
        jsonArray.put(jsonMap);

        System.out.println(jsonArray.toString());

    }
}

您可以阅读有关API的更多信息这里：
http://json.org/java/

You can read more about the API here: http://json.org/java/

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