Golang Writer.Close方法代码示例

func (r Client) PostWithMultiPartData(req_url string, headers map[string][]string, params map[string][]string, body io.Reader, filename string) (resp *http.Response, err error) {
	var buffer *bytes.Buffer = new(bytes.Buffer)
	var writer *multipart.Writer = multipart.NewWriter(buffer)
	for k, v := range params {
		for _, field := range v {
			err1 := writer.WriteField(k, field)
			if err1 != nil {
				err = err1
				return
			}
		}
	}
	w, err := writer.CreateFormFile("file", filename)
	if err != nil {
		return
	}
	_, err = io.Copy(w, body)
	if err != nil {
		return
	}
	err = writer.Close()
	if err != nil {
		return
	}
	if headers == nil {
		headers = make(map[string][]string)
	}
	headers["Content-Type"] = []string{writer.FormDataContentType()}
	return r.Post(req_url, headers, buffer, int64(buffer.Len()))
}

func sendSnapFile(snapPath string, snapFile *os.File, pw *io.PipeWriter, mw *multipart.Writer, action *actionData) {
	defer snapFile.Close()

	if action.SnapOptions == nil {
		action.SnapOptions = &SnapOptions{}
	}
	errs := []error{
		mw.WriteField("action", action.Action),
		mw.WriteField("name", action.Name),
		mw.WriteField("snap-path", action.SnapPath),
		mw.WriteField("channel", action.Channel),
		mw.WriteField("devmode", strconv.FormatBool(action.DevMode)),
	}
	for _, err := range errs {
		if err != nil {
			pw.CloseWithError(err)
			return
		}
	}

	fw, err := mw.CreateFormFile("snap", filepath.Base(snapPath))
	if err != nil {
		pw.CloseWithError(err)
		return
	}

	_, err = io.Copy(fw, snapFile)
	if err != nil {
		pw.CloseWithError(err)
		return
	}

	mw.Close()
	pw.Close()
}

func SendMediaRequest(client *twittergo.Client, reqUrl string, params map[string]string, media []byte) (mediaResp twittergo.MediaResponse, err error) {
	var (
		req         *http.Request
		resp        *twittergo.APIResponse
		body        io.ReadWriter = bytes.NewBufferString("")
		mp          *multipart.Writer
		writer      io.Writer
		contentType string
	)
	mp = multipart.NewWriter(body)
	for key, value := range params {
		mp.WriteField(key, value)
	}
	if media != nil {
		if writer, err = mp.CreateFormField("media"); err != nil {
			return
		}
		writer.Write(media)
	}
	contentType = fmt.Sprintf("multipart/form-data;boundary=%v", mp.Boundary())
	mp.Close()
	if req, err = http.NewRequest("POST", reqUrl, body); err != nil {
		return
	}
	req.Header.Set("Content-Type", contentType)
	if resp, err = client.SendRequest(req); err != nil {
		return
	}
	err = resp.Parse(&mediaResp)
	return
}

func (a *BuyActivity) encodeChunkedFirstTransmission(log bitwrk.Logger, mwriter *multipart.Writer) (err error) {
	part, err := mwriter.CreateFormFile("a32chunks", "a32chunks.bin")
	if err != nil {
		return
	}
	log.Printf("Sending work chunk hashes to seller [%v].", *a.tx.WorkerURL)
	err = cafs.WriteChunkHashes(a.workFile, part)
	if err != nil {
		return
	}
	log.Printf("Sending buyer's secret to seller.")
	err = mwriter.WriteField("buyersecret", a.buyerSecret.String())
	if err != nil {
		return
	}
	return mwriter.Close()
}

// streamingUpload streams a file via a pipe through a multipart.Writer.
// Generally one should use newStreamingUpload instead of calling this directly.
func streamingUpload(file *os.File, fileName string, postBodyWriter *multipart.Writer, w *io.PipeWriter) {
	defer GinkgoRecover()
	defer file.Close()
	defer w.Close()

	// Set up the form file
	fileWriter, err := postBodyWriter.CreateFormFile("file", fileName)
	if err != nil {
		Failf("Unable to to write file at %s to buffer. Error: %s", fileName, err)
	}

	// Copy kubectl binary into the file writer
	if _, err := io.Copy(fileWriter, file); err != nil {
		Failf("Unable to to copy file at %s into the file writer. Error: %s", fileName, err)
	}

	// Nothing more should be written to this instance of the postBodyWriter
	if err := postBodyWriter.Close(); err != nil {
		Failf("Unable to close the writer for file upload. Error: %s", err)
	}
}

func writePluginToWriter(pw io.WriteCloser, bufin []*bufio.Reader, writer *multipart.Writer, pluginPaths []string, errChan chan error) {
	for i, pluginPath := range pluginPaths {
		part, err := writer.CreateFormFile("snap-plugins", pluginPath)
		if err != nil {
			errChan <- err
			return
		}
		if CompressUpload {
			cpart := gzip.NewWriter(part)
			_, err := bufin[i].WriteTo(cpart)
			if err != nil {
				errChan <- err
				return
			}
			err = cpart.Close()
			if err != nil {
				errChan <- err
				return
			}
		} else {
			_, err := bufin[i].WriteTo(part)
			if err != nil {
				errChan <- err
				return
			}
		}
	}
	err := writer.Close()
	if err != nil {
		errChan <- err
		return
	}
	err = pw.Close()
	if err != nil {
		errChan <- err
		return
	}
	errChan <- nil
}

func GetBody() (body io.ReadWriter, header string, err error) {
	var (
		mp     *multipart.Writer
		media  []byte
		writer io.Writer
	)
	body = bytes.NewBufferString("")
	mp = multipart.NewWriter(body)
	media, err = ioutil.ReadFile("tweet_media/media.png")
	if err != nil {
		return
	}
	mp.WriteField("status", fmt.Sprintf("Hello %v!", time.Now()))
	writer, err = mp.CreateFormFile("media[]", "media.png")
	if err != nil {
		return
	}
	writer.Write(media)
	header = fmt.Sprintf("multipart/form-data;boundary=%v", mp.Boundary())
	mp.Close()
	return
}

func TestHTTPAPI(t *testing.T) {
	// get volume
	// upload
	// uploads
	// delete
	// deletes
	var (
		client http.Client
		s      *Store
		z      *zk.Zookeeper
		w      *multipart.Writer
		f      *os.File
		bw     io.Writer
		req    *http.Request
		resp   *http.Response
		body   []byte
		err    error
		buf    = &bytes.Buffer{}
		tr     = &testRet{}
	)
	os.Remove(testConf.Store.VolumeIndex)
	os.Remove(testConf.Store.FreeVolumeIndex)
	os.Remove("./test/_free_block_1")
	os.Remove("./test/1_0")
	defer os.Remove(testConf.Store.VolumeIndex)
	defer os.Remove(testConf.Store.FreeVolumeIndex)
	defer os.Remove("./test/_free_block_1")
	defer os.Remove("./test/1_0")
	if z, err = zk.NewZookeeper(testConf); err != nil {
		t.Errorf("NewZookeeper() error(%v)", err)
		t.FailNow()
	}
	defer z.Close()
	z.DelVolume(1)
	defer z.DelVolume(1)
	if s, err = NewStore(testConf); err != nil {
		t.Errorf("NewStore() error(%v)", err)
		t.FailNow()

	}
	defer s.Close()
	StartAdmin("localhost:6064", s)
	time.Sleep(1 * time.Second)
	buf.Reset()
	buf.WriteString("n=1&bdir=./test/&idir=./test/")
	if resp, err = http.Post("http://localhost:6064/add_free_volume", "application/x-www-form-urlencoded", buf); err != nil {
		t.Errorf("http.Post() error(%v)", err)
		t.FailNow()
	}
	defer resp.Body.Close()
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		t.Errorf("ioutil.ReadAll() error(%v)", err)
		t.FailNow()
	}
	if err = json.Unmarshal(body, tr); err != nil {
		t.Errorf("json.Unmarshal() error(%v)", err)
		t.FailNow()
	}
	if tr.Ret != 1 {
		t.Errorf("add_free_volume: %d", tr.Ret)
		t.FailNow()
	}
	buf.Reset()
	buf.WriteString("vid=1")
	if resp, err = http.Post("http://localhost:6064/add_volume", "application/x-www-form-urlencoded", buf); err != nil {
		t.Errorf("http.Post() error(%v)", err)
		t.FailNow()
	}
	defer resp.Body.Close()
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		t.Errorf("ioutil.ReadAll() error(%v)", err)
		t.FailNow()
	}
	if err = json.Unmarshal(body, tr); err != nil {
		t.Errorf("json.Unmarshal() error(%v)", err)
		t.FailNow()
	}
	if tr.Ret != 1 {
		t.FailNow()
	}
	StartApi("localhost:6062", s, testConf)
	time.Sleep(1 * time.Second)
	buf.Reset()
	w = multipart.NewWriter(buf)
	if bw, err = w.CreateFormFile("file", "./test/1.jpg"); err != nil {
		t.Errorf("w.CreateFormFile() error(%v)", err)
		t.FailNow()
	}
	if f, err = os.Open("./test/1.jpg"); err != nil {
		t.Errorf("os.Open() error(%v)", err)
		t.FailNow()
	}
	defer f.Close()
	if _, err = io.Copy(bw, f); err != nil {
		t.Errorf("io.Copy() error(%v)", err)
		t.FailNow()
	}
	if err = w.WriteField("vid", "1"); err != nil {
		t.Errorf("w.WriteField() error(%v)", err)
		t.FailNow()
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	} else {
		bodyWriter = mw
	}
	if msg.TextBody != "" {
		textHeader := make(textproto.MIMEHeader)
		textHeader.Set("Content-Type", "text/plain; charset=UTF-8")
		tpw, err := bodyWriter.CreatePart(textHeader)
		if err != nil {
			return err
		}
		if _, err := io.WriteString(tpw, msg.TextBody); err != nil {
			return err
		}
		tpw.Write(crlf)
		tpw.Write(crlf)
	}
	attached := make(map[*Attachment]bool)
	if msg.HTMLBody != "" {
		var htmlAttachments []*Attachment
		for _, v := range msg.Attachments {
			if v.ContentID != "" && strings.Contains(msg.HTMLBody, fmt.Sprintf("cid:%s", v.ContentID)) {
				htmlAttachments = append(htmlAttachments, v)
				attached[v] = true
			}
		}
		var htmlWriter *multipart.Writer
		if len(htmlAttachments) > 0 {
			relatedHeader := make(textproto.MIMEHeader)
			relatedBoundary := makeBoundary()
			relatedHeader.Set("Content-Type", fmt.Sprintf("multipart/related; boundary=%q; type=\"text/html\"", relatedBoundary))
			rw, err := bodyWriter.CreatePart(relatedHeader)
			if err != nil {
				return err
			}
			htmlWriter = multipart.NewWriter(rw)
			htmlWriter.SetBoundary(relatedBoundary)
		} else {
			htmlWriter = bodyWriter
		}
		htmlHeader := make(textproto.MIMEHeader)
		htmlHeader.Set("Content-Type", "text/html; charset=UTF-8")
		thw, err := htmlWriter.CreatePart(htmlHeader)
		if err != nil {
			return err
		}
		if _, err := io.WriteString(thw, msg.HTMLBody); err != nil {
			return err
		}
		thw.Write(crlf)
		thw.Write(crlf)
		for _, v := range htmlAttachments {
			attachmentHeader := make(textproto.MIMEHeader)
			attachmentHeader.Set("Content-Disposition", "inline")
			attachmentHeader.Set("Content-Id", fmt.Sprintf("<%s>", v.ContentID))
			attachmentHeader.Set("Content-Transfer-Encoding", "base64")
			attachmentHeader.Set("Content-Type", v.ContentType)
			aw, err := htmlWriter.CreatePart(attachmentHeader)
			if err != nil {
				return err
			}
			b := make([]byte, base64.StdEncoding.EncodedLen(len(v.Data)))
			base64.StdEncoding.Encode(b, v.Data)
			aw.Write(b)
		}
		if htmlWriter != bodyWriter {
			if err := htmlWriter.Close(); err != nil {
				return err
			}
		}
	}
	if bodyWriter != mw {
		if err := bodyWriter.Close(); err != nil {
			return err
		}
	}
	for _, v := range msg.Attachments {
		if attached[v] {
			continue
		}
		attachmentHeader := make(textproto.MIMEHeader)
		attachmentHeader.Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", v.Name))
		attachmentHeader.Set("Content-Transfer-Encoding", "base64")
		attachmentHeader.Set("Content-Type", v.ContentType)
		aw, err := mw.CreatePart(attachmentHeader)
		if err != nil {
			return err
		}
		b := make([]byte, base64.StdEncoding.EncodedLen(len(v.Data)))
		base64.StdEncoding.Encode(b, v.Data)
		aw.Write(b)
	}
	if err := mw.Close(); err != nil {
		return err
	}
	if server == "echo" {
		printer(buf.String())
		return nil
	}
	return smtp.SendMail(server, auth, from, to, buf.Bytes())
}

// Http params
func Http(method, uri string, params url.Values, buf []byte, res interface{}) (err error) {
	var (
		body    []byte
		w       *multipart.Writer
		bw      io.Writer
		bufdata = &bytes.Buffer{}
		req     *http.Request
		resp    *http.Response
		ru      string
		enc     string
		ctype   string
	)
	enc = params.Encode()
	if enc != "" {
		ru = uri + "?" + enc
	}
	if method == "GET" {
		if req, err = http.NewRequest("GET", ru, nil); err != nil {
			return
		}
	} else {
		if buf == nil {
			if req, err = http.NewRequest("POST", uri, strings.NewReader(enc)); err != nil {
				return
			}
			req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
		} else {
			w = multipart.NewWriter(bufdata)
			if bw, err = w.CreateFormFile("file", "1.jpg"); err != nil {
				return
			}
			if _, err = bw.Write(buf); err != nil {
				return
			}
			for key, _ := range params {
				w.WriteField(key, params.Get(key))
			}
			ctype = w.FormDataContentType()
			if err = w.Close(); err != nil {
				return
			}
			if req, err = http.NewRequest("POST", uri, bufdata); err != nil {
				return
			}
			req.Header.Set("Content-Type", ctype)
		}
	}
	td := _timer.Start(5*time.Second, func() {
		_canceler(req)
	})
	if resp, err = _client.Do(req); err != nil {
		log.Errorf("_client.Do(%s) error(%v)", ru, err)
		return
	}
	td.Stop()
	defer resp.Body.Close()
	if res == nil {
		return
	}
	if resp.StatusCode != http.StatusOK {
		log.Errorf("_client.Do(%s) status: %d", ru, resp.StatusCode)
		return
	}
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		log.Errorf("ioutil.ReadAll(%s) uri(%s) error(%v)", body, ru, err)
		return
	}
	if err = json.Unmarshal(body, res); err != nil {
		log.Errorf("json.Unmarshal(%s) uri(%s) error(%v)", body, ru, err)
	}
	return
}

func PostFile(req_url, path, filename string, start, end, filesize int, params map[string]string) (body string, err error) {
	var buffer *bytes.Buffer = bytes.NewBuffer(make([]byte, 0))
	var writer *multipart.Writer = multipart.NewWriter(buffer)

	for k, v := range params {
		err = writer.WriteField(k, v)
		if err != nil {
			return
		}
	}

	var file *os.File
	if file, err = os.OpenFile(path, os.O_RDONLY, 0644); err != nil {
		return
	}
	defer file.Close()

	w, err := writer.CreateFormFile("file", filename)
	if err != nil {
		return
	}

	var size = end - start + 1
	if size == filesize {
		_, err = io.Copy(w, file)
		if err != nil {
			return
		}
	} else {
		var section []byte = make([]byte, size)
		var n int
		n, err = file.ReadAt(section, int64(start))
		if err != nil || n != size {
			return
		}
		var buf *bytes.Buffer = bytes.NewBuffer(make([]byte, 0))
		buf.Write(section)
		_, err = io.Copy(w, buf)
		if err != nil {
			return
		}
	}
	writer.Close()

	var client *http.Client = new(http.Client)
	var req *http.Request
	req, err = http.NewRequest("POST", req_url, buffer)
	if err != nil {
		return
	}
	req.Header.Set("Content-Type", writer.FormDataContentType())
	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0")
	var resp *http.Response
	resp, err = client.Do(req)
	if err != nil {
		return
	}
	defer resp.Body.Close()
	resp_body, err := ioutil.ReadAll(resp.Body)
	body = string(resp_body)
	if resp.StatusCode != 200 {
		err = errors.New(fmt.Sprintf("%d", resp.StatusCode))
		return
	}
	return
}

func (douban *Douban) post(requestUrl string, accessToken string, params Params, picReader io.Reader, picFormat string, response interface{}) error {
	var urlBuffer bytes.Buffer
	urlBuffer.WriteString(requestUrl)

	var bodyBuffer bytes.Buffer
	var writer *multipart.Writer
	if picReader == nil {
		body := url.Values{}
		for k, v := range params {
			value := fmt.Sprint(v)
			body.Add(k, value)
		}
		bodyBuffer = *bytes.NewBufferString(body.Encode())
	} else {
		writer = multipart.NewWriter(&bodyBuffer)
		picWriter, err := writer.CreateFormFile("image", "image."+picFormat)
		if err != nil {
			return err
		}
		_, e := io.Copy(picWriter, picReader)
		if e != nil {
			return e
		}

		for k, v := range params {
			value := fmt.Sprint(v)
			if k != "" && value != "" {
				writer.WriteField(k, value)
			}
		}
		writer.Close()
	}
	//	log.Printf("URL: %s\n", urlBuffer.String())
	//	log.Printf("Body: %#v\n", bodyBuffer)

	req, err := http.NewRequest("POST", urlBuffer.String(), &bodyBuffer)
	if err != nil {
		return err
	}
	req.Header.Add("Authorization", accessToken)

	if picReader == nil {
		req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
	} else {
		req.Header.Add("Content-Type", writer.FormDataContentType())
	}
	//	log.Printf("Header: %#V\n", req.Header)
	resp, err := douban.httpClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	respContent, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}

	if resp.StatusCode != 200 {
		doubanError := DoubanError{}
		err := json.Unmarshal(respContent, &doubanError)
		if err != nil {
			return err
		} else {
			return &doubanError
		}
	}
	//log.Printf("==================================\n================================\n%s\n", respContent)
	return json.Unmarshal(respContent, &response)

}

//.........这里部分代码省略.........
	}

	// Only include an empty plain text body if the html body is also empty.
	if m.Body != "" || m.Body == "" && m.HTMLBody == "" {
		if altw != nil {
			header = textproto.MIMEHeader{}
		}
		header.Add("Content-Type", "text/plain; charset=utf-8")
		header.Add("Content-Transfer-Encoding", "quoted-printable")
		//header.Add("Content-Transfer-Encoding", "base64")

		var writer io.Writer
		if altw != nil {
			partw, err := altw.CreatePart(header)
			if err != nil {
				return nil, err
			}
			writer = partw
		} else {
			writer = buffer
			err = writeHeader(buffer, header)
			if err != nil {
				return nil, err
			}
		}

		bodyBytes := []byte(m.Body)
		//encoder := NewBase64MimeEncoder(writer)
		encoder := qprintable.NewEncoder(qprintable.DetectEncoding(m.Body), writer)
		_, err = encoder.Write(bodyBytes)
		if err != nil {
			return nil, err
		}
		err = encoder.Close()
		if err != nil {
			return nil, err
		}
	}

	if m.HTMLBody != "" {
		if altw != nil {
			header = textproto.MIMEHeader{}
		}
		header.Add("Content-Type", "text/html; charset=utf-8")
		//header.Add("Content-Transfer-Encoding", "quoted-printable")
		header.Add("Content-Transfer-Encoding", "base64")

		var writer io.Writer
		if altw != nil {
			partw, err := altw.CreatePart(header)
			if err != nil {
				return nil, err
			}
			writer = partw
		} else {
			writer = buffer
			err = writeHeader(buffer, header)
			if err != nil {
				return nil, err
			}
		}

		htmlBodyBytes := []byte(m.HTMLBody)
		encoder := NewBase64MimeEncoder(writer)
		//encoder := qprintable.NewEncoder(qprintable.DetectEncoding(m.HTMLBody), writer)
		_, err = encoder.Write(htmlBodyBytes)

func TestHTTPAPI(t *testing.T) {
	// get volume
	// upload
	// uploads
	// delete
	// deletes
	var (
		client http.Client
		s      *Store
		z      *Zookeeper
		w      *multipart.Writer
		f      *os.File
		bw     io.Writer
		req    *http.Request
		resp   *http.Response
		body   []byte
		err    error
		buf    = &bytes.Buffer{}
		tr     = &testRet{}
		file   = "./test/store_api.idx"
		bfile  = "./test/block_api_1"
		ifile  = "./test/block_api_1.idx"
	)
	os.Remove(file)
	os.Remove(bfile)
	os.Remove(ifile)
	defer os.Remove(file)
	defer os.Remove(bfile)
	defer os.Remove(ifile)
	t.Log("NewStore()")
	if z, err = NewZookeeper([]string{"localhost:2181"}, time.Second*1, "/rack/test-api/"); err != nil {
		t.Errorf("NewZookeeper() error(%v)", err)
		t.FailNow()
	}
	z.DelVolume(1)
	if s, err = NewStore(z, file); err != nil {
		t.Errorf("NewStore() error(%v)", err)
		t.FailNow()

	}
	defer s.Close()
	StartAdmin(s, "localhost:6064")
	time.Sleep(1 * time.Second)
	t.Log("AddFreeVolume()")
	buf.Reset()
	buf.WriteString("n=1&bdir=./test/&idir=./test/")
	if resp, err = http.Post("http://localhost:6064/add_free_volume", "application/x-www-form-urlencoded", buf); err != nil {
		t.Errorf("http.Post() error(%v)", err)
		t.FailNow()
	}
	defer resp.Body.Close()
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		t.Errorf("ioutil.ReadAll() error(%v)", err)
		t.FailNow()
	}
	t.Logf("%s", body)
	if err = json.Unmarshal(body, tr); err != nil {
		t.Errorf("json.Unmarshal() error(%v)", err)
		t.FailNow()
	}
	if tr.Ret != 1 {
		t.FailNow()
	}
	t.Log("AddVolume()")
	buf.Reset()
	buf.WriteString("vid=1")
	if resp, err = http.Post("http://localhost:6064/add_volume", "application/x-www-form-urlencoded", buf); err != nil {
		t.Errorf("http.Post() error(%v)", err)
		t.FailNow()
	}
	defer resp.Body.Close()
	if body, err = ioutil.ReadAll(resp.Body); err != nil {
		t.Errorf("ioutil.ReadAll() error(%v)", err)
		t.FailNow()
	}
	t.Logf("%s", body)
	if err = json.Unmarshal(body, tr); err != nil {
		t.Errorf("json.Unmarshal() error(%v)", err)
		t.FailNow()
	}
	if tr.Ret != 1 {
		t.FailNow()
	}
	StartApi(s, "localhost:6062")
	time.Sleep(1 * time.Second)
	t.Log("Upload")
	buf.Reset()
	w = multipart.NewWriter(buf)
	if bw, err = w.CreateFormFile("file", "./test/1.jpg"); err != nil {
		t.Errorf("w.CreateFormFile() error(%v)", err)
		t.FailNow()
	}
	if f, err = os.Open("./test/1.jpg"); err != nil {
		t.Errorf("os.Open() error(%v)", err)
		t.FailNow()
	}
	defer f.Close()
	if _, err = io.Copy(bw, f); err != nil {
		t.Errorf("io.Copy() error(%v)", err)
		t.FailNow()
//.........这里部分代码省略.........

// 向微博API服务器发送POST请求
//
// 输入参数的含义请见Upload函数注释。当reader == nil时使用query string模式，否则使用multipart。
func (weibo *Weibo) sendPostHttpRequest(uri string, token string, params Params, reader io.Reader, imageFormat string, response interface{}) error {
	// 生成POST请求URI
	requestUri := fmt.Sprintf("%s?access_token=%s", uri, token)

	// 生成POST内容
	var bodyBuffer bytes.Buffer
	var writer *multipart.Writer
	if reader == nil {
		// reader为nil时无文件上传，因此POST body为简单的query string模式
		pb := url.Values{}
		pb.Add("access_token", token)

		for k, v := range params {
			value := fmt.Sprint(v)
			if k != "" && value != "" {
				pb.Add(k, value)
			}
		}
		bodyBuffer = *bytes.NewBufferString(pb.Encode())
	} else {
		// 否则POST body使用multipart模式
		writer = multipart.NewWriter(&bodyBuffer)
		imagePartWriter, _ := writer.CreateFormFile("pic", "image."+imageFormat)
		io.Copy(imagePartWriter, reader)
		for k, v := range params {
			value := fmt.Sprint(v)
			if k != "" && value != "" {
				writer.WriteField(k, value)
			}
		}
		writer.Close()
	}

	// 生成POST请求
	req, err := http.NewRequest("POST", requestUri, &bodyBuffer)
	if err != nil {
		return err
	}
	if reader == nil {
		// reader为nil时使用一般的内容类型
		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	} else {
		// 否则使用带boundary的multipart类型
		req.Header.Set("Content-Type", writer.FormDataContentType())
	}

	// 发送请求
	resp, err := weibo.httpClient.Do(req)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	// 解析API服务器返回内容
	bytes, _ := ioutil.ReadAll(resp.Body)
	if resp.StatusCode == 200 {
		err := json.Unmarshal(bytes, &response)
		if err != nil {
			return err
		}
		return nil
	} else {
		var weiboErr WeiboError
		err := json.Unmarshal(bytes, &weiboErr)
		if err != nil {
			return err
		}
		return weiboErr
	}
	return nil
}