gson解析json

gson解析json

public class Student 
{
	public String name;
	public int age;
	public boolean sex;
}

Object轉json串：

	Gson gson = new Gson();
	String json = gson.toJson(student);

json轉Object：

	private static void parser2Object() 
	{
		// json轉換 爲簡單對象
		String json = "{'name':'張三','age':18,'sex':true}";
		Gson gson = new Gson();
		Student student = gson.fromJson(json, Student.class);//
		System.out.println(student);
	}

json轉List：

	private static void parser2List() 
	{
		String json = "[{'name':'劉1','age':18,'sex':true},{'name':'劉2','age':19,'sex':false}]";
		Gson gson = new Gson();
		TypeToken<List<Student>> token = new com.google.gson.reflect.TypeToken<List<Student>>() {};//
		List<Student> stus = gson.fromJson(json, token.getType());
	}

json轉Map：

	private static void parser2Map() 
	{
		String json = "[{'name':'劉1','age':18,'sex':true},{'name':'劉2','age':19,'sex':false}]";
		Gson gson = new Gson();
		TypeToken<Map<String, Student>> token = new com.google.gson.reflect.TypeToken<Map<String, Student>>() {};
		Map<String, Student> stus = gson.fromJson(json, token.getType());
	}

json先節點解析，在轉換：

	private static void parser2() 
	{
		// 節點解析
		String json = "{'status':200,'data':{'name':'張三','age':18,'sex':true}}";
		// 1.獲得 解析者
		JsonParser parser = new JsonParser();
		// 2.獲得 根節點元素
		JsonElement element = parser.parse(json);
		// 3.根據 文檔判斷根節點屬於 什麼類型的 Gson節點對象
		JsonObject root = element.getAsJsonObject();
		// 4. 取得 節點 下 的某個節點的 value
		JsonPrimitive flagJson = root.getAsJsonPrimitive("status");
		int asInt = flagJson.getAsInt();// 請求返回判斷
		JsonObject dataJson = root.getAsJsonObject("data");
		// (JsonElement, Class<T>) element->obj/arr  
		Student student = new Gson().fromJson(dataJson, Student.class);
		root.getAsJsonArray();
	}

嵌套類解析：

public class NewsBean 
{
	public int code;
	public ArrayList<NewsMenuData> data;

	public class NewsMenuData
	{
		public String id;
		public String title;
		public ArrayList<NewsTabData> children;
		// toString...
	}

	public class NewsTabData 
	{
		public String id;
		public String title;
		// toString...
	}
	// toString...
}

		{
		    'code': 1,
		    'data': [
		        {
		            'id': 1,
		            'title': 'news',
		            'children': [
		                {
		                    'id': 1,
		                    'title': 'dataTitle'
		                },
		                {
		                    'id': 1,
		                    'title': 'dataTitle'
		                }
		            ]
		        },
		        {
		            'id': 2,
		            'title': 'news',
		            'children': [
		                {
		                    'id': 1,
		                    'title': 'dataTitle'
		                },
		                {
		                    'id': 1,
		                    'title': 'dataTitle'
		                }
		            ]
		        }
		    ]
		}

		String json = "{'code':1,'data':[{'id':1,'title':'news','children':[{'id':1,'title':'dataTitle'},{'id':2,'title':'news','children':[{'id':1,'title':'dataTitle'}]},{'id':1,'title':'news','children':[{'id':2,'title':'dataTitle'},{'id':2,'title':'news','children':[{'id':1,'title':'dataTitle'}]}]}";
		Gson gson = new Gson();
		NewsBean student = gson.fromJson(json, NewsBean.class);//