Next, create handler methods for each structure in your JSON text. You'll - * need a method for each object type and for each array type. - *
When a nested object or array is encountered, delegate to the - * corresponding handler method. - * - *
When an unknown name is encountered, strict parsers should fail with an - * exception. Lenient parsers should call {@link #skipValue()} to recursively - * skip the value's nested tokens, which may otherwise conflict. - * - *
If a value may be null, you should first check using {@link #peek()}. - * Null literals can be consumed using either {@link #nextNull()} or {@link - * #skipValue()}. - * - *
{@code
- * [
- * {
- * "id": 912345678901,
- * "text": "How do I read a JSON stream in Java?",
- * "geo": null,
- * "user": {
- * "name": "json_newb",
- * "followers_count": 41
- * }
- * },
- * {
- * "id": 912345678902,
- * "text": "@json_newb just use JsonReader!",
- * "geo": [50.454722, -104.606667],
- * "user": {
- * "name": "jesse",
- * "followers_count": 2
- * }
- * }
- * ]}
- * This code implements the parser for the above structure: {@code
- *
- * public List readJsonStream(InputStream in) throws IOException {
- * JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
- * try {
- * return readMessagesArray(reader);
- * } finally {
- * reader.close();
- * }
- * }
- *
- * public List readMessagesArray(JsonReader reader) throws IOException {
- * List messages = new ArrayList();
- *
- * reader.beginArray();
- * while (reader.hasNext()) {
- * messages.add(readMessage(reader));
- * }
- * reader.endArray();
- * return messages;
- * }
- *
- * public Message readMessage(JsonReader reader) throws IOException {
- * long id = -1;
- * String text = null;
- * User user = null;
- * List geo = null;
- *
- * reader.beginObject();
- * while (reader.hasNext()) {
- * String name = reader.nextName();
- * if (name.equals("id")) {
- * id = reader.nextLong();
- * } else if (name.equals("text")) {
- * text = reader.nextString();
- * } else if (name.equals("geo") && reader.peek() != JsonToken.NULL) {
- * geo = readDoublesArray(reader);
- * } else if (name.equals("user")) {
- * user = readUser(reader);
- * } else {
- * reader.skipValue();
- * }
- * }
- * reader.endObject();
- * return new Message(id, text, user, geo);
- * }
- *
- * public List readDoublesArray(JsonReader reader) throws IOException {
- * List doubles = new ArrayList();
- *
- * reader.beginArray();
- * while (reader.hasNext()) {
- * doubles.add(reader.nextDouble());
- * }
- * reader.endArray();
- * return doubles;
- * }
- *
- * public User readUser(JsonReader reader) throws IOException {
- * String username = null;
- * int followersCount = -1;
- *
- * reader.beginObject();
- * while (reader.hasNext()) {
- * String name = reader.nextName();
- * if (name.equals("name")) {
- * username = reader.nextString();
- * } else if (name.equals("followers_count")) {
- * followersCount = reader.nextInt();
- * } else {
- * reader.skipValue();
- * }
- * }
- * reader.endObject();
- * return new User(username, followersCount);
- * }}
- *
- *