HTTP-POST文件多部分

本文介绍了HTTP-POST文件多部分的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试使用Go包mime/multipart和http发送多部分表格，我需要一些帮助来解决它.

I'm trying to send a multipart form using Go packages mime/multipart and http, and I need some help to solve it.

HTML将是:

<html>
<head><title>Multipart Test</title></head>
<body>
<form action="/multipart" enctype="multipart/form-data" method="POST">

<label for="file"> Please select a File </label>
<input id="file" type="file" name="file"/>
<br>
<label for="input1"> Please write some text </label>
<input id="input1" type="text" name="input1"/>
<br>
<label for="input2"> Please write some more text </label>
<input id="input2" type="text" name="input2"/>
<br>
<input type="submit" name="Submit" value="Submit"/>
</body>

我的Go方法是这样的:

And my Go approach is like this:

var buffer bytes.Buffer
w := multipart.NewWriter(&buffer)
// Write fields and files
w.CreateFormField("input1")
w.WriteField("input1","value1")
w.CreateFormFile("file","filename.dat")
// I need a Reader to here to read the file, but how ?
// then send the request
resp,err := http.Post(url,w.FormDataContentType(),&buffer)

推荐答案

可以在此示例代码

// Upload file to google code
func Upload(tarball string) (err os.Error) {
    // Create buffer
    buf := new(bytes.Buffer) // caveat IMO dont use this for large files, \
    // create a tmpfile and assemble your multipart from there (not tested)
    w := multipart.NewWriter(buf)
    // Create a form field writer for field label
    label, err := w.CreateFormField("label")
    if err != nil {
        return err
    }
    // Write label field
    label.Write([]byte("label here"))
    // Create a form field writer for field summary
    summary, err := w.CreateFormField("summary")
    if err != nil {
        return err
    }
    // Write summary field
    summary.Write([]byte("summary here"))
    // Create file field
    fw, err := w.CreateFormFile("upload", tarball)
    if err != nil {
        return err
    }
    fd, err := os.Open(tarball)
    if err != nil {
        return err
    }
    defer fd.Close()
    // Write file field from file to upload
    _, err = io.Copy(fw, fd)
    if err != nil {
        return err
    }
    // Important if you do not close the multipart writer you will not have a
    // terminating boundry
    w.Close()
    req, err := http.NewRequest("POST", repoUrl, buf)
    if err != nil {
        return err
    }
    req.Header.Set("Content-Type", w.FormDataContentType())
    req.SetBasicAuth("email@email.com", "password")
    res, err := client.Do(req)
    if err != nil {
        return err
    }
    io.Copy(os.Stderr, res.Body) // Replace this with Status.Code check
    return err
}

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