Android json数据解析

1. get()：在确定key存在的条件下使用，否则当无法检索到相关key时，将会抛出一个Exception异常信息
2. opt()：这个方法相对比较灵活，当无法获取所指定数值时，将会返回一个默认值，并不会抛出异常（个人推荐使用这个方法）

private String getJsonByNetwork() {
	// You can get json by this url
	final String url = "http://api.androidhive.info/contacts/";
	DefaultHttpClient httpClient = new DefaultHttpClient();
	HttpGet httpGet = new HttpGet(url);

	InputStream inputStream = null;
	String result = null;

	try {
		HttpResponse response = httpClient.execute(httpGet);
		inputStream = response.getEntity().getContent();

		// Json is UTF-8 by default
		BufferedReader reader = new BufferedReader(new InputStreamReader(
				inputStream, "UTF-8"));
		StringBuilder sb = new StringBuilder();
		String tmp = null;

		while ((tmp = reader.readLine()) != null) {
			sb.append(tmp);
		}

		result = sb.toString();
	} catch (Exception e) {
		try {
			if (inputStream != null) {
				inputStream.close();
			}
		} catch (IOException se) {
		}
	}

	return result;
}

// Create a JSONObject
JSONObject jsonObject = new JSONObject(result);

// To get a specific JSONArray
JSONArray jsonArray = jsonObject.getJSONArray("contacts");

// To get items from the array
for (int i = 0; i < jsonArray.length(); i ++) {
    // TODO：Traverse the jsonarray
}

// Create a JSONObject
JSONObject jsonObject = new JSONObject(result);

// To get a specific JSONArray
JSONArray jsonArray = jsonObject.getJSONArray("contacts");

// To get items from the array
for (int i = 0; i < jsonArray.length(); i++) {
	// To get a specific JSONObject
	JSONObject oneObject = jsonArray.getJSONObject(i);
}

// Create a JSONObject
JSONObject jsonObject = new JSONObject(result);

// To get a specific JSONArray
JSONArray jsonArray = jsonObject.getJSONArray("contacts");

// To get items from the array
for (int i = 0; i < jsonArray.length(); i++) {
	// To get a specific JSONObject
	JSONObject oneObject = jsonArray.getJSONObject(i);

	// To get a specific string
	String id = oneObject.getString("id");
	String name = oneObject.getString("name");

	Log.e("wzy", "id is:" + id + ", name is " + name);
}

03-05 10:26:08.690: E/wzy(26401): id is:c200, name is Ravi Tamada
03-05 10:26:08.690: E/wzy(26401): id is:c201, name is Johnny Depp
03-05 10:26:08.690: E/wzy(26401): id is:c202, name is Leonardo Dicaprio
03-05 10:26:08.690: E/wzy(26401): id is:c203, name is John Wayne
03-05 10:26:08.691: E/wzy(26401): id is:c204, name is Angelina Jolie
03-05 10:26:08.691: E/wzy(26401): id is:c205, name is Dido
03-05 10:26:08.691: E/wzy(26401): id is:c206, name is Adele
03-05 10:26:08.692: E/wzy(26401): id is:c207, name is Hugh Jackman
03-05 10:26:08.693: E/wzy(26401): id is:c208, name is Will Smith
03-05 10:26:08.693: E/wzy(26401): id is:c209, name is Clint Eastwood
03-05 10:26:08.694: E/wzy(26401): id is:c2010, name is Barack Obama
03-05 10:26:08.694: E/wzy(26401): id is:c2011, name is Kate Winslet
03-05 10:26:08.695: E/wzy(26401): id is:c2012, name is Eminem