xml - Go多级数据结构

Question

全部处理，

我想返回多级数据 json 给用户。像这样

{ "screen"[{ 
           "screen_id":"001",
           "screen_name":"screen_001"
            "key": [ {
                    "id":"key_001",
                    "name":"key_001"                                   
                    },    
                     {
                    "id":"key_002",
                    "name":"key_002"                                   
                    },   
                   ] 
           }, 
           "screen_id":"002",
           "screen_name":"screen_002"
            "key": [ {
                    "id":"key_002",
                    "name":"key_002"                                   
                    },    
                     {
                    "id":"key_003",
                    "name":"key_003"                                   
                    },   
                   ] 
       }

我想使用 XML 将更适合表示数据结构的方式，因为屏幕项目和关键子项目将被动态插入。我是对的，还是存在其他更好的方法？如果使用 XML，您能否说明一下？

谢谢

Answer 1

下面的代码可以满足您的需求。关键是将 JSON 消息 block 分离成逻辑结构，然后将它们组合在一起以构成消息。参见 http://blog.golang.org/json-and-go和 http://golang.org/pkg/encoding/json/了解更多信息。

要将对象转换为 JSON，请使用 json.Marshal function .

要将对象转换为 XML，请使用 xml.Marshal function .

下面的代码使用 MarshalIndent 函数来漂亮地打印输出。

package main

import (
    "encoding/json"
    "encoding/xml"
    "fmt"
    "log"
)

type Key struct {
    Id   string `json:"id" xml:"id"`
    Name string `json:"name" xml:"name"`
}

type Screen struct {
    ScreenId   string `json:"screen_id" xml:"screen_id"`
    ScreenName string `json:"screen_name" xml:"screen_name"`
    Keys       []Key  `json:"key" xml:"key"`
}

type Message struct {
    Screens []Screen `json:"screen" xml:"screen"`
}

func main() {

    msg := Message{
        []Screen{
            Screen{
                "001",
                "screen_001",
                []Key{
                    Key{
                        "key_001",
                        "key_001",
                    },
                    Key{
                        "key_002",
                        "key_002",
                    },
                },
            },
            Screen{
                "002",
                "screen_002",
                []Key{
                    Key{
                        "key_002",
                        "key_002",
                    },
                    Key{
                        "key_003",
                        "key_003",
                    },
                },
            },
        },
    }

    jsonMsg, err := json.MarshalIndent(msg, "", "\t")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%s\n", jsonMsg)

    xmlMsg, err := xml.MarshalIndent(msg, "", "\t")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%s\n", xmlMsg)
}

将产生:

{
        "screen": [
                {
                        "screen_id": "001",
                        "screen_name": "screen_001",
                        "key": [
                                {
                                        "id": "key_001",
                                        "name": "key_001"
                                },
                                {
                                        "id": "key_002",
                                        "name": "key_002"
                                }
                        ]
                },
                {
                        "screen_id": "002",
                        "screen_name": "screen_002",
                        "key": [
                                {
                                        "id": "key_002",
                                        "name": "key_002"
                                },
                                {
                                        "id": "key_003",
                                        "name": "key_003"
                                }
                        ]
                }
        ]
}
<Message>
        <screen>
                <screen_id>001</screen_id>
                <screen_name>screen_001</screen_name>
                <key>
                        <id>key_001</id>
                        <name>key_001</name>
                </key>
                <key>
                        <id>key_002</id>
                        <name>key_002</name>
                </key>
        </screen>
        <screen>
                <screen_id>002</screen_id>
                <screen_name>screen_002</screen_name>
                <key>
                        <id>key_002</id>
                        <name>key_002</name>
                </key>
                <key>
                        <id>key_003</id>
                        <name>key_003</name>
                </key>
        </screen>
</Message>

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