当我尝试使用go lang调用值时遇到错误

您是loadPost方法返回[]Post。您对的定义Post不包含attribute Post。您的Posts结构确实如此。

这是修改后的工作示例。为了简洁起见，我没有定义其他结构。

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
)

var rawJson = `{
  "posts": [
    {
      "title": "sapien ut nunc",
      "author": "Jeni",
      "content": "[email protected]",
      "publishdate": "26.04.2017",
      "image": "http://dummyimage.com/188x199.png/cc0000/ffffff"
    },
    {
      "title": "mus vivamus vestibulum sagittis",
      "author": "Analise",
      "content": "[email protected]",
      "publishdate": "13.03.2017",
      "image": "http://dummyimage.com/182x113.bmp/ff4444/ffffff"
    }
  ]
}`

type Data struct {
    Posts []struct {
        Title       string `json:"title"`
        Author      string `json:"author"`
        Content     string `json:"content"`
        Publishdate string `json:"publishdate"`
        Image       string `json:"image"`
    } `json:"posts"`
}

func loadFile(fileName string) (string, error) {
    bytes, err := ioutil.ReadFile(fileName)

    if err != nil {
        return "", err
    }
    return string(bytes), nil
}

func loadData() (Data, error) {
    var d Data
    // this is commented out so that i can load raw bytes as an example
    /*
        f, err := os.Open("source/posts.json")
        if err != nil {
            return d, err
        }
        defer f.Close()

        bytes, _ := ioutil.ReadAll(f)
    */

    // replace rawJson with bytes in prod
    json.Unmarshal([]byte(rawJson), &d)
    return d, nil
}

func main() {
    data, err := loadData()
    if err != nil {
        log.Fatal(err)
    }

    for i := 0; i < len(data.Posts); i++ {
        fmt.Println("Title: " + data.Posts[i].Title)
    }

    /*
    // you can also range over the data.Posts if you are not modifying the data then using the index is not necessary. 
    for _, post := range data.Posts {
        fmt.Println("Title: " + post.Title)
    }
    */

}

仅针对文件修改

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
)

type Data struct {
    Posts []struct {
        Title       string `json:"title"`
        Author      string `json:"author"`
        Content     string `json:"content"`
        Publishdate string `json:"publishdate"`
        Image       string `json:"image"`
    } `json:"posts"`
}


func loadData() (Data, error) {
    var d Data
    b, err := ioutil.ReadFile("source/posts.json")
    if err != nil {
        return d, err
    }

    err = json.Unmarshal(b, &d)
    if err != nil {
        return d, err
    }

    return d, nil
}

func main() {
    data, err := loadData()
    if err != nil {
        log.Fatal(err)
    }

    for _, post := range data.Posts {
        fmt.Println("Title: " + post.Title)
    }
}