如何使用golang映射创建JSON数组？

问题描述：

I need to create a JSON array using map.

package main
import "fmt"
func main(){
    id := [5]string{"1","2","3","4","5"}
    name := [5]string{"A","B","C","D","E"}
    parseData := make(map[string]string)
    for counter,_ := range id {
        parseData["id"] = id[counter]
        parseData["name"] = name[counter]
        fmt.Println(parseData)
    }

}

My current output:

map[id:1 name:A]
map[id:2 name:B]
map[id:3 name:C]
map[id:4 name:D]
map[id:5 name:E]

I need a JSON output like below:

[{id:1, name:A},
{id:2, name:B},
{id:3, name:C},
{id:4, name:D},
{id:5, name:E}]

I know basics of using map its a dictionary used for key:value pairs.How can I achieve JSON output using map.

我需要使用map创建一个JSON数组。 p>

 包main 
import“ fmt” 
func main（）{
 id：= [5] string {“ 1”，“ 2”，“ 3”，“  4“，” 5“} 
名称：= [5] string {” A“，” B“，” C“，” D“，” E“} 
 parseData：= make（map [string] string）  
代表计数器，_：=范围ID {
 parseData [“ id”] = id [计数器] 
 parseData [“ name”] =名称[计数器] 
 fmt.Println（parseData）
} 
  
} 
  code>  pre> 
 
 我当前的输出： p> 
 
 
  map [id：1 name：A] 
map [  id：2名称：B] 
map [id：3名称：C] 
map [id：4名称：D] 
map [id：5名称：E] 
  code>  pre> 
 \  n 我需要如下所示的JSON输出： p> 
 
 
  [{{id：1，name：A}，
 {id：2，name：B}，\  n {id：3，名称：C}，
 {id：4，名称：D}，
 {id：5，名称：E}] 
  code>  pre> 
 
 我了解使用map的基础知识，它是用于key：value对的字典。如何使用map实现JSON输出。 p> 
  div>

答

To create array of JSON through map, you need to create one map as a slice and another one just single map and then assign value one by one in single map then append this into slice of map, like follow the below code:

package main

import (
    "fmt"
    "encoding/json"
)

func main(){
    id := [5]string{"1","2","3","4","5"}
    name := [5]string{"A","B","C","D","E"}

    parseData := make([]map[string]interface{}, 0, 0)

    for counter,_ := range id {
        var singleMap = make(map[string]interface{})
        singleMap["id"] = id[counter]
        singleMap["name"] = name[counter]
        parseData = append(parseData, singleMap)
    }
    b, _:= json.Marshal(parseData)
    fmt.Println(string(b))
}

Also you can test over here

it prints JSON as:

[{"id":"1","name":"A"},
{"id":"2","name":"B"},
{"id":"3","name":"C"},
{"id":"4","name":"D"},
{"id":"5","name":"E"}]

答

For me this more looks like an array of objects. You can have your desired output like this:

type data struct {
    Id string
    Name string
}

func main(){
    id := [5]string{"1","2","3","4","5"}
    name := [5]string{"A","B","C","D","E"}
    var parsedData []data

    for counter := range id {
        parsedData = append(parsedData, data{Name: name[counter], Id: id[counter]})
    }

    bytes, _ := json.Marshal(parsedData)
    fmt.Print(string(bytes))
}

The output should look like this:

[
 {"Id":"1","Name":"A"},
 {"Id":"2","Name":"B"},
 {"Id":"3","Name":"C"},
 {"Id":"4","Name":"D"},
 {"Id":"5","Name":"E"}
]

如何使用golang映射创建JSON数组？

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