JSON对象和字符串相互转化

• fastjson

/** JSON对象和字符串相互转化 * */
public class JsonTest {
    
    public static void main(String[] args) {
    

        String datauin = "{\"stepInfoList\":[{\"timestamp\":1656777600,\"step\":8061},{\"timestamp\":1656864000,\"step\":9729},{\"timestamp\":1656950400,\"step\":7707},{\"timestamp\":1657036800,\"step\":10395},{\"timestamp\":1657123200,\"step\":12105},{\"timestamp\":1657209600,\"step\":10122},{\"timestamp\":1657296000,\"step\":5429},{\"timestamp\":1657382400,\"step\":7787},{\"timestamp\":1657468800,\"step\":9280},{\"timestamp\":1657555200,\"step\":14718},{\"timestamp\":1657641600,\"step\":11521},{\"timestamp\":1657728000,\"step\":9522},{\"timestamp\":1657814400,\"step\":11351},{\"timestamp\":1657900800,\"step\":4744},{\"timestamp\":1657987200,\"step\":14134},{\"timestamp\":1658073600,\"step\":13120},{\"timestamp\":1658160000,\"step\":10435},{\"timestamp\":1658246400,\"step\":9260},{\"timestamp\":1658332800,\"step\":11384},{\"timestamp\":1658419200,\"step\":7020},{\"timestamp\":1658505600,\"step\":7544},{\"timestamp\":1658592000,\"step\":14012},{\"timestamp\":1658678400,\"step\":10117},{\"timestamp\":1658764800,\"step\":12207},{\"timestamp\":1658851200,\"step\":9484},{\"timestamp\":1658937600,\"step\":8209},{\"timestamp\":1659024000,\"step\":12646},{\"timestamp\":1659110400,\"step\":8928},{\"timestamp\":1659196800,\"step\":5946},{\"timestamp\":1659283200,\"step\":8288},{\"timestamp\":1659369600,\"step\":5421}],\"watermark\":{\"timestamp\":1659440140,\"appid\":\"wx66314a80dc7d2c46\"}}\n";
        // 将字符串转化成json对象
        JSONObject jsonObject = JSONObject.parseObject(datauin);
        jsonObject.put("key","value");
        String value = jsonObject.getString("key");
        // json对象转成字符串
        String s = jsonObject.toString();


    }

}