给了一个例子，利用mime/multipart来实现client如何上传一个文件到server，然后server如何接受这个文件。
看server.go代码
package main
import (
"io"
"os"
"fmt"
"io/ioutil"
"net/http"
)
func uploadHandler(w http.ResponseWriter, r *http.Request) {
reader, err := r.MultipartReader()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
for {
part, err := reader.NextPart()
if err == io.EOF {
break
}
fmt.Printf("FileName=[%s], FormName=[%s]\n", part.FileName(), part.FormName())
if part.FileName() == "" { // this is FormData
data, _ := ioutil.ReadAll(part)
fmt.Printf("FormData=[%s]\n", string(data))
} else { // This is FileData
dst, _ := os.Create("./" + part.FileName() + ".upload")
defer dst.Close()
io.Copy(dst, part)
}
}
}
func main() {
http.HandleFunc("/upload", uploadHandler)
http.ListenAndServe(":8080", nil)
}
例子1：client 上传一个文件
package main
import (
"io"
"os"
"log"
"bytes"
"io/ioutil"
"net/http"
"mime/multipart"
)
func main() {
bodyBuffer := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuffer)
fileWriter, _ := bodyWriter.CreateFormFile("files", "file.txt")
file, _ := os.Open("file.txt")
defer file.Close()
io.Copy(fileWriter, file)
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
resp, _ := http.Post("http://localhost:8080/upload", contentType, bodyBuffer)
defer resp.Body.Close()
resp_body, _ := ioutil.ReadAll(resp.Body)
log.Println(resp.Status)
log.Println(string(resp_body))
}
例子2：client上传多个文件
package main
import (
"io"
"os"
"log"
"bytes"
"io/ioutil"
"net/http"
"mime/multipart"
)
func main() {
bodyBuffer := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuffer)
// file1
fileWriter1, _ := bodyWriter.CreateFormFile("files", "file1.txt")
file1, _ := os.Open("file1.txt")
defer file1.Close()
io.Copy(fileWriter1, file1)
// file2
fileWriter2, _ := bodyWriter.CreateFormFile("files", "file2.txt")
file2, _ := os.Open("file2.txt")
defer file2.Close()
io.Copy(fileWriter2, file2)
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
resp, _ := http.Post("http://localhost:8080/upload", contentType, bodyBuffer)
defer resp.Body.Close()
resp_body, _ := ioutil.ReadAll(resp.Body)
log.Println(resp.Status)
log.Println(string(resp_body))
}
例子3：上传其他Form数据
package main
import (
"io"
"os"
"log"
"bytes"
"io/ioutil"
"net/http"
"mime/multipart"
)
func main() {
bodyBuffer := &bytes.Buffer{}
bodyWriter := multipart.NewWriter(bodyBuffer)
// file1
fileWriter1, _ := bodyWriter.CreateFormFile("files", "file1.txt")
file1, _ := os.Open("file1.txt")
defer file1.Close()
io.Copy(fileWriter1, file1)
// file2
fileWriter2, _ := bodyWriter.CreateFormFile("files", "file2.txt")
file2, _ := os.Open("file2.txt")
defer file2.Close()
io.Copy(fileWriter2, file2)
// other form data
extraParams := map[string]string{
"title": "My Document",
"author": "Matt Aimonetti",
"description": "A document with all the Go programming language secrets",
}
for key, value := range extraParams {
_ = bodyWriter.WriteField(key, value)
}
contentType := bodyWriter.FormDataContentType()
bodyWriter.Close()
resp, _ := http.Post("http://localhost:8080/upload", contentType, bodyBuffer)
defer resp.Body.Close()
resp_body, _ := ioutil.ReadAll(resp.Body)
log.Println(resp.Status)
log.Println(string(resp_body))
}
看server端的运行输出：
$ go build server.go && ./server
FileName=[file1.txt], FormName=[files]
FileName=[file2.txt], FormName=[files]
FileName=[], FormName=[description]
FormData=[A document with all the Go programming language secrets]
FileName=[], FormName=[title]
FormData=[My Document]
FileName=[], FormName=[author]
FormData=[Matt Aimonetti]
$ ls -l
total 25180
-rwxr-xr-x 1 ... 6179399 Jun 22 08:07 client
-rw-r--r-- 1 ... 1952 Jun 22 08:06 client.go
-rw-r--r-- 1 ... 15 Jun 22 07:11 file1.txt
-rw-r--r-- 1 ... 15 Jun 22 08:28 file1.txt.upload
-rw-r--r-- 1 ... 14 Jun 22 07:11 file2.txt
-rw-r--r-- 1 ... 14 Jun 22 08:28 file2.txt.upload
-rw-r--r-- 1 ... 15 Jun 22 07:56 file.txt
-rw-r--r-- 1 ... 15 Jun 22 08:10 file.txt.upload
-rwxr-xr-x 1 ... 6717437 Jun 22 07:59 server
-rw-r--r-- 1 ... 1580 Jun 22 07:58 server.go