JSON解析

一、Android自帶JSON解析的API

1.讀取JSON格式數據

{
	"languages":[
		{"id":1,"ide":"Eclipse","name":"Java"},
		{"id":2,"ide":"XCode","name":"Swift"},
		{"id":3,"ide":"Visual","name":"C#"}
	],
	"cat":"it"
}

<span style="white-space:pre">	</span>try {
            InputStreamReader isr = new InputStreamReader(getAssets().open("test.json"), "UTF-8");
            BufferedReader br = new BufferedReader(isr);
            String line;
            StringBuilder builder = new StringBuilder();
            while ((line = br.readLine()) != null) {
                builder.append(line);
            }
            br.close();
            isr.close();
            JSONObject root = new JSONObject(builder.toString());
            System.out.println("cat=" + root.getString("cat"));
            JSONArray array = root.getJSONArray("languages");
            for (int i = 0; i < array.length(); i++) {
                JSONObject lan = array.getJSONObject(i);
                System.out.println("------------------------------");
                System.out.println("id=" + lan.getInt("id"));
                System.out.println("name=" + lan.getString("name"));
                System.out.println("ide=" + lan.getString("ide"));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }

2.創建JSON格式數據

        try {
            JSONObject root = new JSONObject();
            root.put("cat", "it");

            JSONObject lan1 = new JSONObject();
            lan1.put("id", 1);
            lan1.put("name", "Java");
            lan1.put("ide", "Eclipse");

            JSONObject lan2 = new JSONObject();
            lan2.put("id", 2);
            lan2.put("name", "Swift");
            lan2.put("ide", "XCode");

            JSONObject lan3 = new JSONObject();
            lan3.put("id", 3);
            lan3.put("name", "C#");
            lan3.put("ide", "Visual");

            JSONArray array = new JSONArray();
            array.put(lan1);
            array.put(lan2);
            array.put(lan3);

            root.put("languages", array);

            System.out.println(root.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }