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                # package multipart `import "mime/multipart"` multipart實現了MIME的multipart解析,參見[RFC 2046](http://tools.ietf.org/html/rfc2046)。該實現適用于HTTP([RFC 2388](http://tools.ietf.org/html/rfc2388))和常見瀏覽器生成的multipart主體。 ## Index * [type File](#File) * [type FileHeader](#FileHeader) * [func (fh \*FileHeader) Open() (File, error)](#FileHeader.Open) * [type Part](#Part) * [func (p \*Part) FileName() string](#Part.FileName) * [func (p \*Part) FormName() string](#Part.FormName) * [func (p \*Part) Read(d []byte) (n int, err error)](#Part.Read) * [func (p \*Part) Close() error](#Part.Close) * [type Form](#Form) * [func (f \*Form) RemoveAll() error](#Form.RemoveAll) * [type Reader](#Reader) * [func NewReader(r io.Reader, boundary string) \*Reader](#NewReader) * [func (r \*Reader) ReadForm(maxMemory int64) (f \*Form, err error)](#Reader.ReadForm) * [func (r \*Reader) NextPart() (\*Part, error)](#Reader.NextPart) * [type Writer](#Writer) * [func NewWriter(w io.Writer) \*Writer](#NewWriter) * [func (w \*Writer) FormDataContentType() string](#Writer.FormDataContentType) * [func (w \*Writer) Boundary() string](#Writer.Boundary) * [func (w \*Writer) SetBoundary(boundary string) error](#Writer.SetBoundary) * [func (w \*Writer) CreatePart(header textproto.MIMEHeader) (io.Writer, error)](#Writer.CreatePart) * [func (w \*Writer) CreateFormField(fieldname string) (io.Writer, error)](#Writer.CreateFormField) * [func (w \*Writer) CreateFormFile(fieldname, filename string) (io.Writer, error)](#Writer.CreateFormFile) * [func (w \*Writer) WriteField(fieldname, value string) error](#Writer.WriteField) * [func (w \*Writer) Close() error](#Writer.Close) ### Examples * [NewReader](#example-NewReader) ## type [File](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L142 "View Source") ``` type File interface { io.Reader io.ReaderAt io.Seeker io.Closer } ``` File是一個接口,實現了對一個multipart信息中文件記錄的訪問。它的內容可以保持在內存或者硬盤中,如果保持在硬盤中,底層類型就會是\*os.File。 ## type [FileHeader](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L122 "View Source") ``` type FileHeader struct { Filename string Header textproto.MIMEHeader // 內含隱藏或非導出字段 } ``` FileHeader描述一個multipart請求的(一個)文件記錄的信息。 ### func (\*FileHeader) [Open](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L131 "View Source") ``` func (fh *FileHeader) Open() (File, error) ``` Open方法打開并返回其關聯的文件。 ## type [Part](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L28 "View Source") ``` type Part struct { // 主體的頭域,如果存在,是按Go的http.Header風格標準化的,如"foo-bar"改變為"Foo-Bar"。 // 有一個特殊情況,如果"Content-Transfer-Encoding"頭的值是"quoted-printable"。 // 該頭將從本map中隱藏,而主體會在調用Read時透明的解碼。 Header textproto.MIMEHeader // 內含隱藏或非導出字段 } ``` Part代表multipart主體的單獨一個記錄。 ### func (\*Part) [FileName](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L68 "View Source") ``` func (p *Part) FileName() string ``` 返回Part?的Content-Disposition?頭的文件名參數。 ### func (\*Part) [FormName](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L54 "View Source") ``` func (p *Part) FormName() string ``` 如果p的Content-Disposition頭值為"form-data",則返回名字參數;否則返回空字符串。 ### func (\*Part) [Read](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L131 "View Source") ``` func (p *Part) Read(d []byte) (n int, err error) ``` Read方法讀取一個記錄的主體,也就是其頭域之后到下一記錄之前的部分。 ### func (\*Part) [Close](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L200 "View Source") ``` func (p *Part) Close() error ``` ## type [Form](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L100 "View Source") ``` type Form struct { Value map[string][]string File map[string][]*FileHeader } ``` Form是一個解析過的multipart表格。它的File參數部分保存在內存或者硬盤上,可以使用\*FileHeader類型屬性值的Open方法訪問。它的Value?參數部分保存為字符串,兩者都以屬性名為鍵。 ### func (\*Form) [RemoveAll](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L106 "View Source") ``` func (f *Form) RemoveAll() error ``` 刪除Form關聯的所有臨時文件。 ## type [Reader](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L208 "View Source") ``` type Reader struct { // 內含隱藏或非導出字段 } ``` Reader是MIME的multipart主體所有記錄的迭代器。Reader的底層會根據需要解析輸入,不支持Seek。 ### func [NewReader](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L90 "View Source") ``` func NewReader(r io.Reader, boundary string) *Reader ``` 函數使用給出的MIME邊界和r創建一個multipart讀取器。 邊界一般從信息的"Content-Type"?頭的"boundary"屬性獲取。可使用mime.ParseMediaType函數解析這種頭域。 Example ``` msg := &mail.Message{ Header: map[string][]string{ "Content-Type": []string{"multipart/mixed; boundary=foo"}, }, Body: strings.NewReader( "--foo\r\nFoo: one\r\n\r\nA section\r\n" + "--foo\r\nFoo: two\r\n\r\nAnd another\r\n" + "--foo--\r\n"), } mediaType, params, err := mime.ParseMediaType(msg.Header.Get("Content-Type")) if err != nil { log.Fatal(err) } if strings.HasPrefix(mediaType, "multipart/") { mr := multipart.NewReader(msg.Body, params["boundary"]) for { p, err := mr.NextPart() if err == io.EOF { return } if err != nil { log.Fatal(err) } slurp, err := ioutil.ReadAll(p) if err != nil { log.Fatal(err) } fmt.Printf("Part %q: %q\n", p.Header.Get("Foo"), slurp) } } ``` Output: ``` Part "one": "A section" Part "two": "And another" ``` ### func (\*Reader) [ReadForm](https://github.com/golang/go/blob/master/src/mime/multipart/formdata.go#L23 "View Source") ``` func (r *Reader) ReadForm(maxMemory int64) (f *Form, err error) ``` ReadForm解析整個multipart信息中所有Content-Disposition頭的值為"form-data"的記錄。它會把最多maxMemory字節的文件記錄保存在內存里,其余保存在硬盤的臨時文件里。 ### func (\*Reader) [NextPart](https://github.com/golang/go/blob/master/src/mime/multipart/multipart.go#L222 "View Source") ``` func (r *Reader) NextPart() (*Part, error) ``` NextPart返回multipart的下一個記錄或者返回錯誤。如果沒有更多記錄會返回io.EOF。 ## type [Writer](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L18 "View Source") ``` type Writer struct { // 內含隱藏或非導出字段 } ``` Writer類型用于生成multipart信息。 ### func [NewWriter](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L26 "View Source") ``` func NewWriter(w io.Writer) *Writer ``` NewWriter函數返回一個設定了一個隨機邊界的Writer,數據寫入w。 ### func (\*Writer) [FormDataContentType](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L67 "View Source") ``` func (w *Writer) FormDataContentType() string ``` 方法返回w對應的HTTP multipart請求的Content-Type的值,多以multipart/form-data起始。 ### func (\*Writer) [Boundary](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L34 "View Source") ``` func (w *Writer) Boundary() string ``` 方法返回該Writer的邊界。 ### func (\*Writer) [SetBoundary](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L43 "View Source") ``` func (w *Writer) SetBoundary(boundary string) error ``` SetBoundary方法重寫Writer默認的隨機生成的邊界為提供的boundary參數。方法必須在創建任何記錄之前調用,boundary只能包含特定的ascii字符,并且長度應在1-69字節之間。 ### func (\*Writer) [CreatePart](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L84 "View Source") ``` func (w *Writer) CreatePart(header textproto.MIMEHeader) (io.Writer, error) ``` CreatePart方法使用提供的header創建一個新的multipart記錄。該記錄的主體應該寫入返回的Writer接口。調用本方法后,任何之前的記錄都不能再寫入。 ### func (\*Writer) [CreateFormField](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L134 "View Source") ``` func (w *Writer) CreateFormField(fieldname string) (io.Writer, error) ``` CreateFormField方法使用給出的屬性名調用CreatePart方法。 ### func (\*Writer) [CreateFormFile](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L123 "View Source") ``` func (w *Writer) CreateFormFile(fieldname, filename string) (io.Writer, error) ``` CreateFormFile是CreatePart方法的包裝,?使用給出的屬性名和文件名創建一個新的form-data頭。 ### func (\*Writer) [WriteField](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L142 "View Source") ``` func (w *Writer) WriteField(fieldname, value string) error ``` WriteField方法調用CreateFormField并寫入給出的value。 ### func (\*Writer) [Close](https://github.com/golang/go/blob/master/src/mime/multipart/writer.go#L153 "View Source") ``` func (w *Writer) Close() error ``` Close方法結束multipart信息,并將結尾的邊界寫入底層io.Writer接口。
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