fastjson基本使用

alibaba的fastjson真香啊

首先是依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.73</version>
</dependency>

这里列举点简单的应用

首先是对象转JSON

Map<String, Object> map = new HashMap<>(1 << 3);
map.put("data", "操作成功！");
map.put("code", 200);
map.put("success", true);
map.put("list", Arrays.asList("你好", "加油"));
String jsonString = JSON.toJSONString(map);
System.out.println(jsonString);

输出结果

{“code”:200,”data”:”操作成功！”,”list”:[“你好”,”加油”],”success”:true}

然后是JSON转对象

Map jsonToMap = JSON.parseObject(jsonString, Map.class);
System.out.println(jsonToMap.get("code"));

输出结果

200

从JSON中取值

JSONObject jsonObject = JSON.parseObject(jsonString);
//String
String data = jsonObject.getString("data");
System.out.println(data);
//int
int code = jsonObject.getIntValue("code");
System.out.println(code);
//boolean
boolean success = jsonObject.getBooleanValue("success");
System.out.println(success);
//list
JSONArray list = jsonObject.getJSONArray("list");
list.forEach(System.out::println);