gson使用小结

------------------------------------maven配置

		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.6.2</version>
		</dependency>

-------------------------------------解析json字符串：

{}包的是对象，[] 包的是数组，:左右两边分别是字段和值

------------------------------------解析数组，复杂的对象数组也是这样解析，只要最外层是[]：

		 //解析数组
		String jsonArray = "[\"Android\",\"Java\",\"PHP\"]";
		String[] strs=gson.fromJson(jsonArray, String[].class);

------------------------------------解析对象：

String strJson = "{\"students\":[{\"name\":\"Jack\",\"age\":12}, {\"name\":\"Vista\",\"age\":23}, {\"name\":\"Kaka\",\"age\":22}, {\"name\":\"Hony\",\"age\":31}]}";
		 StuResult students=gson.fromJson(strJson, StuResult.class);

Jsonreader解析代码：

public class JsonTest2 {
	public static void main(String[] args) {
		JsonReader reader=new JsonReader(new InputStreamReader(JsonTest2.class.getResourceAsStream("/pattern/newsinfo.json")));
		//解析数组
		ParamObj[] paramObjs=new Gson().fromJson(reader, ParamObj[].class);
		System.out.println(paramObjs.length);
	}
		
}

------------------------------------gson.toJson代码Demo

public class JsonTest3 {
	public static void main(String[] args) {
		Gson gson=new Gson();
		List<String> list=new ArrayList<>();
		list.add("aaa");
		list.add("bbb");
		Map<String, String> map=new HashMap<>();
		map.put("a", "aaaa");
		map.put("b", "bbbb");
		People people=new People("bob","22",list);
		System.out.println(gson.toJson(list));
		System.out.println(gson.toJson(map));
		System.out.println(gson.toJson(people));
	}
	
}