JsonObject和Gson详解

参考文件：http://www.cnblogs.com/xwdreamer/archive/2011/12/16/2296904.html
一、JsonObject

1.JAR包简介

要使程序可以运行必须引入JSON-lib包，JSON-lib包同时依赖于以下的JAR包：

commons-lang.jar
commons-beanutils.jar
commons-collections.jar
commons-logging.jar
ezmorph.jar
json-lib-2.4-jdk15.jar
json-lib-2.4-jdk15-javadoc.jar
json-lib-2.4-jdk15-sources.jar

2.JSONObject对象使用

JSON-lib包是一个beans,collections,maps,java arrays 和XML和JSON互相转换的包。在本例中，我们将使用JSONObject类创建JSONObject对象，然后我们打印这些对象的值。为了使用JSONObject对象，我们要引入"net.sf.json"包。为了给对象添加元素，我们要使用put()方法。

public static User getUserFromJson(String json) {User user = new User();try {JSONObject obj = JSONObject.fromObject(json);user.setUserId(obj.getInt(Tables.User.Fields.USERID));user.setAccount(obj.getString(Tables.User.Fields.ACCOUNT));user.setPassword(obj.getString(Tables.User.Fields.PASSWORD));user.setGender(obj.getInt(Tables.User.Fields.GENDER));user.setPermission(obj.getInt(Tables.User.Fields.PERMISSION));user.setName(obj.getString(Tables.User.Fields.NAME));user.setRemark(obj.getString(Tables.User.Fields.REMARK));user.setContact(obj.getString(Tables.User.Fields.CONTACT));return user;} catch (Exception ex) {ex.printStackTrace();}return null;}

二、Gson处理Json格式数据

1.Object to json格式

public String getAllVideosByJson() throws Exception {List<Video> videos = service.getAllVideos();StringBuilder sb = new StringBuilder();//Gson gson = new Gson();Gson gson = new Gson();String result = gson.toJson(videos);return result;}

2.json格式的字符串变为Video对象

public static List<Video> getJSONAllVideos_2() throws Exception {String path = "http://192.168.2.107:8080/VideoWeb/VideoServlet?format=json&type=get";URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setReadTimeout(5 * 1000);conn.setRequestMethod("GET");InputStream inStream = conn.getInputStream();byte[] data = StreamTool.readInputStream(inStream);String json = new String(data);Type typeList = new TypeToken<ArrayList<Video>>() {}.getType();Gson gson = new Gson();ArrayList<Video> videos = gson.fromJson(json, typeList);return videos;}

1.JAR包简介

2.JSONObject对象使用

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