JSON解析

一、Android自带JSON解析的API

1.读取JSON格式数据

{
"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.创建JSON格式数据
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();
}