我不知道如何在Golang中使用来自Flutter的数据。

huangapple go评论97阅读模式
英文:

I don't know how to use data sent from flutter in golang

问题

以下是将数据从Flutter传输到Golang的逻辑代码:

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"mime/multipart"
	"net/http"
	"os"
)

type Pages struct {
	Order       uint     `json:"order"`
	Description string   `json:"description"`
	Images      []string `json:"images"`
}

type Tags struct {
	TagId   uint   `json:"id"`
	TagName string `json:"tag_name"`
}

type GetData struct {
	Title    string `json:"title"`
	Date     string `json:"date"`
	Location string `json:"location"`
	Address  string `json:"address"`
	Tags     []Tags `json:"tag_list"`
	Pages    []Pages `json:"pages"`
}

func handleRequest(w http.ResponseWriter, r *http.Request) {
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	var data GetData
	err = json.Unmarshal(body, &data)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	// 处理接收到的数据
	fmt.Println("Received Data:")
	fmt.Println("Title:", data.Title)
	fmt.Println("Date:", data.Date)
	fmt.Println("Location:", data.Location)
	fmt.Println("Address:", data.Address)
	fmt.Println("Tags:")
	for _, tag := range data.Tags {
		fmt.Println("Tag ID:", tag.TagId)
		fmt.Println("Tag Name:", tag.TagName)
	}
	fmt.Println("Pages:")
	for _, page := range data.Pages {
		fmt.Println("Order:", page.Order)
		fmt.Println("Description:", page.Description)
		fmt.Println("Images:")
		for _, image := range page.Images {
			fmt.Println("Image Path:", image)
			// 将文件数据保存到S3或其他存储服务
			// 这里只是示例,你需要根据实际情况进行处理
			saveToS3(image)
		}
	}

	// 返回响应
	w.WriteHeader(http.StatusOK)
	w.Write([]byte("Data received successfully"))
}

func saveToS3(filePath string) {
	// 将文件保存到S3的逻辑代码
	// 这里只是示例,你需要根据实际情况进行处理
	fmt.Println("Saving file to S3:", filePath)
}

func main() {
	http.HandleFunc("/test", handleRequest)
	http.ListenAndServe(":8080", nil)
}

上述代码是一个简单的示例,它接收来自Flutter的数据并进行处理。你可以根据实际需求修改处理数据的逻辑,比如将文件保存到S3或其他存储服务中。请注意,这只是一个示例,你需要根据实际情况进行适当的修改和处理。

英文:
        var request = http.MultipartRequest('post', Uri.parse(TravelingUrl.testAddress + '/test'));
request.fields['title'] = createDiary.value.title as String;
request.fields['tag_list'] = createDiary.value.tagList.toString();
request.fields['date'] = createDiary.value.date.toString();
for (var i = 0; i < createDiary.value.pages!.length; i++) {
Pages _tempPage = createDiary.value.pages![i];
request.fields['pages[$i][order]'] = jsonEncode(_tempPage.order);
request.fields['pages[$i][description]'] =
jsonEncode(_tempPage.description);
for (var ii = 0; ii < _tempPage.images!.length; ii++) {
request.files.add(await http.MultipartFile.fromPath(
'pages[$i][images]', _tempPage.images![ii]));
}
}
var response = await request.send();

The code above is the logic to transfer data from flutter to golang.

and i want use in golang what recived data from flutter.

i defined struct at golang like this

    type _pages struct {
Order       uint             `json:"order"`
Description string           `json:"description"`
Images      []multipart.File `json:"images"`
}
type _tags struct {
TagId   uint   `json:"id"`
TagName string `json:"tag_name"`
}
type _getData struct {
Title    string `json:"title"`
Date     string `json:"date"`
Location string `json:"location"`
Address  string `json:"address"`
_tags
_pages
}

I'm not familiar with golang, please help, can I see a simple example of getting data and using it?

There is file data in the array variable, I want to receive the data and save this file data to s3.

答案1

得分: 1

调用Request.FormValueRequest.FormFile来获取值和文件。

对于类似数组的字段,生成与客户端相同的字符串参数名称。循环遍历数组索引,并在页面没有该字段时跳出循环。

title := r.FormValue("title")
tagList := r.FormValue("tag_list")
...
for i := 0; i < maxPossiblePages; i++ {
   if _, ok := r.Form[fmt.Sprintf("pages[%d][order]", i)]; !ok {
        break;
   }
   pageOrder := r.FormValue(fmt.Sprintf("pages[%d][order]", i))
   pageDescription := r.FormValue(fmt.Sprintf("pages[%d][description]", i))
   ...
}
英文:

Call Request.FormValue and Request.FormFile to get the values and files.

For the array-like fields, generate string parameter names as the client does. Loop though array indices and break when there is no field for the page.

title := r.FormValue(&quot;title&quot;)
tagList := r.FormValue(&quot;tag_list&quot;)
...
for i := 0; i &lt; maxPossiblePages; i++ { 
if _, ok := r.Form[fmt.Sprintf(&quot;pages[%d][order]&quot;, i)]; !ok { 
break; 
} 
pageOrder := r.FormValue(fmt.Sprintf(&quot;pages[%d][order]&quot;, i))
pageDescription := r.FormValue(fmt.Sprintf(&quot;pages[%d][description]&quot;, i))
...
}

huangapple
  • 本文由 发表于 2021年9月16日 13:36:08
  • 转载请务必保留本文链接:https://go.coder-hub.com/69202845.html
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