英文:
http.Post data-binary, curl equivalent in golang
问题
我正在尝试使用net/http将一个JSON文件发送到ElasticSearch。通常在Curl中，我会执行以下操作：
curl -XPOST localhost:9200/prod/aws -d @aws.json
在Go语言中，我使用了一个示例，但它没有起作用。我可以看到它在发送，但肯定有一些设置不正确。我已经测试了我使用的JSON文件，它是可用的。
Go代码：
target_url := "http://localhost:9200/prod/aws"
body_buf := bytes.NewBufferString("")
body_writer := multipart.NewWriter(body_buf)
jsonfile := "aws.json"
file_writer, err := body_writer.CreateFormFile("upfile", jsonfile)
if err != nil {
fmt.Println("写入缓冲区时出错")
return
}
fh, err := os.Open(jsonfile)
if err != nil {
fmt.Println("打开文件时出错")
return
}
io.Copy(file_writer, fh)
body_writer.Close()
http.Post(target_url, "application/json", body_buf)
英文:
I'm trying to use net/http to post a json file to ElasticSearch. Normally in Curl I would do the following:
curl -XPOST localhost:9200/prod/aws -d @aws.json
In golang I've used an example but it has not worked. I can see it posting but something must be set incorrectly. I've tested the JSON file I am using and it's good to go.
Go code:
target_url := "http://localhost:9200/prod/aws"
body_buf := bytes.NewBufferString("")
body_writer := multipart.NewWriter(body_buf)
jsonfile := "aws.json"
file_writer, err := body_writer.CreateFormFile("upfile", jsonfile)
if err != nil {
fmt.Println("error writing to buffer")
return
}
fh, err := os.Open(jsonfile)
if err != nil {
fmt.Println("error opening file")
return
}
io.Copy(file_writer, fh)
body_writer.Close()
http.Post(target_url, "application/json", body_buf)
答案1
得分: 7
如果你想从文件中读取 JSON，可以使用以下代码：
jsonStr, err := ioutil.ReadFile("filename.json")
if err != nil {
panic(err)
}
在 HTTP POST 请求中以简单的方式发送 JSON。
req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
fmt.Println("response Status:", resp.Status)
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println("response Body:", string(body))
这应该可以工作。
英文:
If you want to read json from file then use .
jsonStr,err := ioutil.ReadFile("filename.json")
if(err!=nil){
panic(err)
}
> Simple way to post json in http post request.
req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))
req.Header.Set("Content-Type", "application/json")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
fmt.Println("response Status:", resp.Status)
body, _ := ioutil.ReadAll(resp.Body)
fmt.Println("response Body:", string(body))
This should work
答案2
得分: 3
请注意，您可以使用io.Reader作为请求体进行Post请求（参考：http://golang.org/pkg/net/http/#Post）：
file, err := os.Open("./aws.json")
resp, err := http.Post(targetUrl, "application/json", file)
// TODO: 处理错误
如果文件非常大，那么这种方法可能比先将文件内容读入内存更有效。
<details>
<summary>英文:</summary>
Note that you can [`Post` with an `io.Reader` as the body](http://golang.org/pkg/net/http/#Post):
file, err := os.Open("./aws.json")
resp, err := http.Post(targetUrl, "application/json", file)
// TODO: handle errors
This might work better than reading the file contents into memory first, especially if the file is very large.
</details>
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