如何在golang中将动态生成的数组对象数据转换为JSON格式的字符串？

小编典典

如何在golang中将动态生成的数组对象数据转换为JSON格式的字符串？

在数据检索中，数据采用数组对象的形式，如下所示：

[{1 fruits Apple Apple is my favorite fruit.} {2 colors Red Red color is always charming.} {3 flowers Lotus It is one of the most beautiful flowers in this world.}]

如何在JSON中更改它。我只需要打破数组对象括号[]。

我已经尝试过了Marshal。但这给了我像：

[{"id":1,"category":"fruits","name":"Apple","description":"Apple is my favorite fruit."},{"id":2,"category":"colors","name":"Red","description":"Red color is always charming."},{"id":3,"category":"flowers","name":"Lotus","description":"It is one of the most beautiful flowers in this world."}]

我尝试过的代码

结构

type Item struct {
 Id          int    `json:"id"`
 Category    string `json:"category"`
 Name        string `json:"name"`
 Description string `json:"description"`
} 
type Items []Item

这里的数据检索功能

func GetData(productQuery interface{}) (result Items, err error) {
 mongoSession := ConnectDb()
 sessionCopy := mongoSession.Copy()
 defer sessionCopy.Close()
 getCollection := mongoSession.DB("custom").C("custom")
 err = getCollection.Find(productQuery).Select(bson.M{"password": 0}).All(&result) //.Skip(skip).Limit(limit)
 if err != nil {
    return result, err
 }
 return result, nil
}
/*
 *
 *  Retrieve the data used by main function
 *
 *
 */

func retrieve(c *gin.Context) {
  conditions := bson.M{}
  data, err :=GetData(conditions)
  if err != nil {
    fmt.Println("There is somthing wrong")
  }
  fmt.Println("--------------------")
  fmt.Println(data)
  fmt.Println("--------------------")
  arrange(data)
  return
}

func arrange(data Items) { 
  pagesJson, err := json.Marshal(data)
  if err != nil {
      log.Fatal("Cannot encode to JSON ", err)
  }
  fmt.Println(string(pagesJson))
}

我想使输出像

{"id": 1,"category": "fruits","name": "Apple","description": "Apple is my favorite fruit."} {"id": 2,"category": "colors","name": "Red",description": "Red color is always charming."} {"id": 3,"category": "flowers","name": "Lotus","description": "It is one of the most beautiful flowers in this world."}

有人可以帮我吗，我尝试了很多次，但是没有成功。

阅读 647

2020-07-02

共1个答案

小编典典

该代码将起作用

package main

import (
  "bytes"
  "encoding/json"
  "fmt"
  "log"
  "strings"
)

type Item struct {
  Id          int    `json:"id"`
  Category    string `json:"category"`
  Name        string `json:"name"`
  Description string `json:"description"`
}

type Items []Item

var myJson = []byte(`[{
 "id":1,
 "category":"fruits",
 "name":"Apple",
 "description":"Apple is my favorite fruit."
},
{
 "id":2,
 "category":"colors",
 "name":"Red",
 "description":"Red color is always charming."
},
{
 "id":3,
 "category":"flowers",
 "name":"Lotus",
 "description":"It is one of the most beautiful flowers in this world."
}]`)

func main() {
    var items Items

    err := json.Unmarshal(myJson, &items)
    if err != nil {
     log.Fatal(err)
    }

    s, err := getMyString(items)
   if err != nil {
        log.Fatal(err)
   }

   fmt.Println(s)
}

func getMyString(items Items) (string, error) {
  var buffer bytes.Buffer
  var err error
  var b []byte

  for _, item := range items {
    b, err = json.Marshal(item)
    if err != nil {
        return "", err
    }

    buffer.WriteString(string(b) + " ")
  }

  s := strings.TrimSpace(buffer.String())

  return s, nil
}

2020-07-02