解析 json 的一个问题

代码如下： ``` package main import ( "encoding/json" "fmt" ) type MqttClientConfigEntry struct { Broker string `json: "broker"` ClientId string `json: "clientId"` CleanSession bool `json: "cleanSession"` KeepAliveInterval uint32 `json: "keepAliveInterval"` Password string `json: "password"` UserName string `json: "userName"` PubTopic string `json: "pubTopic"` SubTopic string `json: "subTopic"` } type MqttClientConfig struct { E MqttClientConfigEntry `json: "MqttClient"` } const s = `{ "MqttClient": { "broker": "8888888888888888888/", "clientId": "11111111111111111", "cleanSession": true, "keepAliveInterval": 100, "password": "2222222222222", "userName": "3333333333333333", "pubTopic": "9999999999", "subTopic": "111111" } }` func main() { var mcc MqttClientConfig err := json.Unmarshal([]byte(s), &mcc) if err != nil { fmt.Println(err) } else { fmt.Println(mcc) } } ``` 程序的目的是解析一个 json 字符串，返回的 error 为 nil，但 MqttClientConfig 对象没有任何数值填充进来： 输出如下 {{ false 0 }}