Gson使用方法之Tree Representation

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Tree prepresentation

利用JsonElement建立LinkedTreeMap来解析json，使用isJsonObject()，isJsonNull()等方法确定JsonElement的类型，利用getAsJsonObject()，getAsJsonPrimitive()等方法拿到对象

代码如下：

import java.io.IOException;import java.net.MalformedURLException;import java.net.URL;import org.apache.commons.io.IOUtils;import com.google.gson.JsonArray;import com.google.gson.JsonElement;import com.google.gson.JsonObject;import com.google.gson.JsonParser;public class ParseTokenTree {public static void main(String[] args) throws MalformedURLException, IOException {// TODO Auto-generated method stubString url = "http://freemusicarchive.org/api/get/albums.json?api_key=60BLHNQCAOUFPIBZ&limit=5";String json = IOUtils.toString(new URL(url));JsonParser parser = new JsonParser();JsonElement element = parser.parse(json);if (element.isJsonObject()) {JsonObject albums = element.getAsJsonObject();System.out.println(albums.get("title").getAsString());JsonArray datasets = albums.getAsJsonArray("dataset");for (int i = 0; i < datasets.size(); i++) {JsonObject dataset = datasets.get(i).getAsJsonObject();System.out.println("album title: " + dataset.get("album_title").getAsString());System.out.println("artist: " + dataset.get("artist_name").getAsString());}}}}

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