参考代码： wx-formdata
问题是：上传文件数据流时，传参方式是：formData.appendFile(name, filepath)，不能满足将一条数据分片上传的需求。看了源代码后，发现this.appendFile这个方法。
this.appendFile = (name, path) => {
let buffer = fileManager.readFileSync(path)
if (Object.prototype.toString.call(buffer).indexOf('ArrayBuffer') < 0) {
return false
}
files.push({
name: name,
buffer: buffer,
fileName: getFileNameFromPath(path)
})
return true
}
改装后，将buffer从外面传入
this.appendFile = (name, buffer, path) => {
// let buffer = fileManager.readFileSync(path);
// if(Object.prototype.toString.call(buffer).indexOf("ArrayBuffer") < 0){
// return false;
// }
files.push({
name: name,
buffer: buffer,
fileName: getFileNameFromPath(path)
})
return true
}
wx-formdata
在小程序中使用 formdata 上传数据，可实现多文件上传
用法
跟浏览器中的 FormData 对象类似
引入 js 文件
const FormData = require('./formData.js')
new 一个 FormData 对象
let formData = new FormData()
调用它的append()方法来添加字段或者调用appendFile()方法添加文件
formData.append('name', 'value')
formData.appendFile('file', name, file, filepath)
添加完成后调用它的getData()生成上传数据，之后调用axios 提交请求
let data = formData.getData()
$httpRequest2 = axios.create({
withCredentials: true,
crossDomain: true,
baseURL: '',
timeout: 6000
})
$httpRequest2({
url: 'https://接口地址',
method: 'POST',
header: {
'content-type': data.contentType
},
data: data.buffer
}).then(res=>{
console.log('分片成功请求：',res)
}) .catch(err => {
console.log('分片上传失败：', err)
})
成员函数
FormData.append()
语法
formData.append(name, value)
参数
| 参数名 | 描述 |
|---|---|
| name | value 中包含的数据对应的表单名称 |
| value | 表单的值 |
FormData.appendFile()
语法
formData.appendFile(name, file, filepath)
参数
| 参数名 | 描述 | |
|---|---|---|
| name | value 中包含的数据对应的表单名称 | |
| file | 文件流 （file 格式或者二进制流都可以） | |
| filepath | 文件路径 |
FormData.getData()
语法
let data = formData.getData()
返回值对象属性
| 属性名 | 描述 |
|---|---|
| buffer | 表单数据的 ArrayBuffer 对象 |
| contentType | http 请求 Content-Type 头部内容 |
结构：
wx-formdata
|——formData.js
|——mimeType.js
formData.js
const mimeMap = require('./mimeMap.js')
function FormData() {
let fileManager = wx.getFileSystemManager()
let data = {}
let files = []
this.append = (name, value) => {
data[name] = value
return true
}
this.appendFile = (name, buffer, path) => {
// let buffer = fileManager.readFileSync(path);
// if(Object.prototype.toString.call(buffer).indexOf("ArrayBuffer") < 0){
// return false;
// }
files.push({
name: name,
buffer: buffer,
fileName: getFileNameFromPath(path)
})
return true
}
this.getData = () => convert(data, files)
}
function getFileNameFromPath(path) {
let idx = path.lastIndexOf('/')
return path.substr(idx + 1)
}
function convert(data, files) {
let boundaryKey = 'wxmpFormBoundary' + randString() // 数据分割符，一般是随机的字符串
let boundary = '--' + boundaryKey
let endBoundary = boundary + '--'
let postArray = []
//拼接参数
if (data && Object.prototype.toString.call(data) == '[object Object]') {
for (let key in data) {
postArray = postArray.concat(formDataArray(boundary, key, data[key]))
}
}
//拼接文件
if (files && Object.prototype.toString.call(files) == '[object Array]') {
for (let i in files) {
let file = files[i]
postArray = postArray.concat(
formDataArray(boundary, file.name, file.buffer, file.fileName)
)
}
}
//结尾
let endBoundaryArray = []
for (var i = 0; i < endBoundary.length; i++) {
// 最后取出结束boundary的charCode
endBoundaryArray.push(...endBoundary.utf8CodeAt(i))
}
postArray = postArray.concat(endBoundaryArray)
return {
contentType: 'multipart/form-data; boundary=' + boundaryKey,
buffer: new Uint8Array(postArray).buffer
}
}
function randString() {
let res = ''
for (let i = 0; i < 17; i++) {
let n = parseInt(Math.random() * 62)
if (n <= 9) {
res += n
} else if (n <= 35) {
res += String.fromCharCode(n + 55)
} else {
res += String.fromCharCode(n + 61)
}
}
return res
}
function formDataArray(boundary, name, value, fileName) {
let dataString = ''
let isFile = !!fileName
dataString += boundary + '\r\n'
dataString += 'Content-Disposition: form-data; name="' + name + '"'
if (isFile) {
dataString += '; filename="' + fileName + '"' + '\r\n'
dataString += 'Content-Type: ' + getFileMime(fileName) + '\r\n\r\n'
} else {
dataString += '\r\n\r\n'
dataString += value
}
var dataArray = []
for (var i = 0; i < dataString.length; i++) {
// 取出文本的charCode（10进制）
dataArray.push(...dataString.utf8CodeAt(i))
}
if (isFile) {
let fileArray = new Uint8Array(value)
dataArray = dataArray.concat(Array.prototype.slice.call(fileArray))
}
dataArray.push(...'\r'.utf8CodeAt())
dataArray.push(...'\n'.utf8CodeAt())
return dataArray
}
function getFileMime(fileName) {
let idx = fileName.lastIndexOf('.')
let mime = mimeMap[fileName.substr(idx)]
return mime ? mime : 'application/octet-stream'
}
String.prototype.utf8CodeAt = function(i) {
var str = this
var out = [],
p = 0
var c = str.charCodeAt(i)
if (c < 128) {
out[p++] = c
} else if (c < 2048) {
out[p++] = (c >> 6) | 192
out[p++] = (c & 63) | 128
} else if (
(c & 0xfc00) == 0xd800 &&
i + 1 < str.length &&
(str.charCodeAt(i + 1) & 0xfc00) == 0xdc00
) {
// Surrogate Pair
c = 0x10000 + ((c & 0x03ff) << 10) + (str.charCodeAt(++i) & 0x03ff)
out[p++] = (c >> 18) | 240
out[p++] = ((c >> 12) & 63) | 128
out[p++] = ((c >> 6) & 63) | 128
out[p++] = (c & 63) | 128
} else {
out[p++] = (c >> 12) | 224
out[p++] = ((c >> 6) & 63) | 128
out[p++] = (c & 63) | 128
}
return out
}
module.exports = FormData
mimeMap.js
module.exports = {
"0.001": "application/x-001",
"0.323": "text/h323",
"0.907": "drawing/907",
".acp": "audio/x-mei-aac",
".aif": "audio/aiff",
".aiff": "audio/aiff",
".asa": "text/asa",
".asp": "text/asp",
".au": "audio/basic",
".awf": "application/vnd.adobe.workflow",
".bmp": "application/x-bmp",
".c4t": "application/x-c4t",
".cal": "application/x-cals",
".cdf": "application/x-netcdf",
".cel": "application/x-cel",
".cg4": "application/x-g4",
".cit": "application/x-cit",
".cml": "text/xml",
".cmx": "application/x-cmx",
".crl": "application/pkix-crl",
".csi": "application/x-csi",
".cut": "application/x-cut",
".dbm": "application/x-dbm",
".dcd": "text/xml",
".der": "application/x-x509-ca-cert",
".dib": "application/x-dib",
".doc": "application/msword",
".drw": "application/x-drw",
".dwf": "Model/vnd.dwf",
".dwg": "application/x-dwg",
".dxf": "application/x-dxf",
".emf": "application/x-emf",
".ent": "text/xml",
".eps": "application/x-ps",
".etd": "application/x-ebx",
".fax": "image/fax",
".fif": "application/fractals",
".frm": "application/x-frm",
".gbr": "application/x-gbr",
".gif": "image/gif",
".gp4": "application/x-gp4",
".hmr": "application/x-hmr",
".hpl": "application/x-hpl",
".hrf": "application/x-hrf",
".htc": "text/x-component",
".html": "text/html",
".htx": "text/html",
".ico": "image/x-icon",
".iff": "application/x-iff",
".igs": "application/x-igs",
".img": "application/x-img",
".isp": "application/x-internet-signup",
".java": "java/*",
".jpe": "image/jpeg",
".jpeg": "image/jpeg",
".jpg": "application/x-jpg",
".jsp": "text/html",
".lar": "application/x-laplayer-reg",
".lavs": "audio/x-liquid-secure",
".lmsff": "audio/x-la-lms",
".ltr": "application/x-ltr",
".m2v": "video/x-mpeg",
".m4e": "video/mpeg4",
".man": "application/x-troff-man",
".mdb": "application/msaccess",
".mfp": "application/x-shockwave-flash",
".mhtml": "message/rfc822",
".mid": "audio/mid",
".mil": "application/x-mil",
".mnd": "audio/x-musicnet-download",
".mocha": "application/x-javascript",
".mp1": "audio/mp1",
".mp2v": "video/mpeg",
".mp4": "video/mpeg4",
".mpd": "application/vnd.ms-project",
".mpeg": "video/mpg",
".mpga": "audio/rn-mpeg",
".mps": "video/x-mpeg",
".mpv": "video/mpg",
".mpw": "application/vnd.ms-project",
".mtx": "text/xml",
".net": "image/pnetvue",
".nws": "message/rfc822",
".out": "application/x-out",
".p12": "application/x-pkcs12",
".p7c": "application/pkcs7-mime",
".p7r": "application/x-pkcs7-certreqresp",
".pc5": "application/x-pc5",
".pcl": "application/x-pcl",
".pdf": "application/pdf",
".pdx": "application/vnd.adobe.pdx",
".pgl": "application/x-pgl",
".pko": "application/vnd.ms-pki.pko",
".plg": "text/html",
".plt": "application/x-plt",
".png": "application/x-png",
".ppa": "application/vnd.ms-powerpoint",
".pps": "application/vnd.ms-powerpoint",
".ppt": "application/x-ppt",
".prf": "application/pics-rules",
".prt": "application/x-prt",
".ps": "application/postscript",
".pwz": "application/vnd.ms-powerpoint",
".ra": "audio/vnd.rn-realaudio",
".ras": "application/x-ras",
".rdf": "text/xml",
".red": "application/x-red",
".rjs": "application/vnd.rn-realsystem-rjs",
".rlc": "application/x-rlc",
".rm": "application/vnd.rn-realmedia",
".rmi": "audio/mid",
".rmm": "audio/x-pn-realaudio",
".rms": "application/vnd.rn-realmedia-secure",
".rmx": "application/vnd.rn-realsystem-rmx",
".rp": "image/vnd.rn-realpix",
".rsml": "application/vnd.rn-rsml",
".rtf": "application/msword",
".rv": "video/vnd.rn-realvideo",
".sat": "application/x-sat",
".sdw": "application/x-sdw",
".slb": "application/x-slb",
".slk": "drawing/x-slk",
".smil": "application/smil",
".snd": "audio/basic",
".sor": "text/plain",
".spl": "application/futuresplash",
".ssm": "application/streamingmedia",
".stl": "application/vnd.ms-pki.stl",
".sty": "application/x-sty",
".swf": "application/x-shockwave-flash",
".tg4": "application/x-tg4",
".tif": "image/tiff",
".tiff": "image/tiff",
".top": "drawing/x-top",
".tsd": "text/xml",
".uin": "application/x-icq",
".vcf": "text/x-vcard",
".vdx": "application/vnd.visio",
".vpg": "application/x-vpeg005",
".vsd": "application/x-vsd",
".vst": "application/vnd.visio",
".vsw": "application/vnd.visio",
".vtx": "application/vnd.visio",
".wav": "audio/wav",
".wb1": "application/x-wb1",
".wb3": "application/x-wb3",
".wiz": "application/msword",
".wk4": "application/x-wk4",
".wks": "application/x-wks",
".wma": "audio/x-ms-wma",
".wmf": "application/x-wmf",
".wmv": "video/x-ms-wmv",
".wmz": "application/x-ms-wmz",
".wpd": "application/x-wpd",
".wpl": "application/vnd.ms-wpl",
".wr1": "application/x-wr1",
".wrk": "application/x-wrk",
".ws2": "application/x-ws",
".wsdl": "text/xml",
".xdp": "application/vnd.adobe.xdp",
".xfd": "application/vnd.adobe.xfd",
".xhtml": "text/html",
".xls": "application/x-xls",
".xml": "text/xml",
".xq": "text/xml",
".xquery": "text/xml",
".xsl": "text/xml",
".xwd": "application/x-xwd",
".sis": "application/vnd.symbian.install",
".x_t": "application/x-x_t",
".apk": "application/vnd.android.package-archive",
"0.301": "application/x-301",
"0.906": "application/x-906",
".a11": "application/x-a11",
".ai": "application/postscript",
".aifc": "audio/aiff",
".anv": "application/x-anv",
".asf": "video/x-ms-asf",
".asx": "video/x-ms-asf",
".avi": "video/avi",
".biz": "text/xml",
".bot": "application/x-bot",
".c90": "application/x-c90",
".cat": "application/vnd.ms-pki.seccat",
".cdr": "application/x-cdr",
".cer": "application/x-x509-ca-cert",
".cgm": "application/x-cgm",
".class": "java/*",
".cmp": "application/x-cmp",
".cot": "application/x-cot",
".crt": "application/x-x509-ca-cert",
".css": "text/css",
".dbf": "application/x-dbf",
".dbx": "application/x-dbx",
".dcx": "application/x-dcx",
".dgn": "application/x-dgn",
".dll": "application/x-msdownload",
".dot": "application/msword",
".dtd": "text/xml",
".dwf": "application/x-dwf",
".dxb": "application/x-dxb",
".edn": "application/vnd.adobe.edn",
".eml": "message/rfc822",
".epi": "application/x-epi",
".eps": "application/postscript",
".exe": "application/x-msdownload",
".fdf": "application/vnd.fdf",
".fo": "text/xml",
".g4": "application/x-g4",
".tif": "image/tiff",
".gl2": "application/x-gl2",
".hgl": "application/x-hgl",
".hpg": "application/x-hpgl",
".hqx": "application/mac-binhex40",
".hta": "application/hta",
".htm": "text/html",
".htt": "text/webviewhtml",
".icb": "application/x-icb",
".ico": "application/x-ico",
".ig4": "application/x-g4",
".iii": "application/x-iphone",
".ins": "application/x-internet-signup",
".IVF": "video/x-ivf",
".jfif": "image/jpeg",
".jpe": "application/x-jpe",
".jpg": "image/jpeg",
".js": "application/x-javascript",
".la1": "audio/x-liquid-file",
".latex": "application/x-latex",
".lbm": "application/x-lbm",
".ls": "application/x-javascript",
".m1v": "video/x-mpeg",
".m3u": "audio/mpegurl",
".mac": "application/x-mac",
".math": "text/xml",
".mdb": "application/x-mdb",
".mht": "message/rfc822",
".mi": "application/x-mi",
".midi": "audio/mid",
".mml": "text/xml",
".mns": "audio/x-musicnet-stream",
".movie": "video/x-sgi-movie",
".mp2": "audio/mp2",
".mp3": "audio/mp3",
".mpa": "video/x-mpg",
".mpe": "video/x-mpeg",
".mpg": "video/mpg",
".mpp": "application/vnd.ms-project",
".mpt": "application/vnd.ms-project",
".mpv2": "video/mpeg",
".mpx": "application/vnd.ms-project",
".mxp": "application/x-mmxp",
".nrf": "application/x-nrf",
".odc": "text/x-ms-odc",
".p10": "application/pkcs10",
".p7b": "application/x-pkcs7-certificates",
".p7m": "application/pkcs7-mime",
".p7s": "application/pkcs7-signature",
".pci": "application/x-pci",
".pcx": "application/x-pcx",
".pdf": "application/pdf",
".pfx": "application/x-pkcs12",
".pic": "application/x-pic",
".pl": "application/x-perl",
".pls": "audio/scpls",
".png": "image/png",
".pot": "application/vnd.ms-powerpoint",
".ppm": "application/x-ppm",
".ppt": "application/vnd.ms-powerpoint",
".pr": "application/x-pr",
".prn": "application/x-prn",
".ps": "application/x-ps",
".ptn": "application/x-ptn",
".r3t": "text/vnd.rn-realtext3d",
".ram": "audio/x-pn-realaudio",
".rat": "application/rat-file",
".rec": "application/vnd.rn-recording",
".rgb": "application/x-rgb",
".rjt": "application/vnd.rn-realsystem-rjt",
".rle": "application/x-rle",
".rmf": "application/vnd.adobe.rmf",
".rmj": "application/vnd.rn-realsystem-rmj",
".rmp": "application/vnd.rn-rn_music_package",
".rmvb": "application/vnd.rn-realmedia-vbr",
".rnx": "application/vnd.rn-realplayer",
".rpm": "audio/x-pn-realaudio-plugin",
".rt": "text/vnd.rn-realtext",
".rtf": "application/x-rtf",
".sam": "application/x-sam",
".sdp": "application/sdp",
".sit": "application/x-stuffit",
".sld": "application/x-sld",
".smi": "application/smil",
".smk": "application/x-smk",
".sol": "text/plain",
".spc": "application/x-pkcs7-certificates",
".spp": "text/xml",
".sst": "application/vnd.ms-pki.certstore",
".stm": "text/html",
".svg": "text/xml",
".tdf": "application/x-tdf",
".tga": "application/x-tga",
".tif": "application/x-tif",
".tld": "text/xml",
".torrent": "application/x-bittorrent",
".txt": "text/plain",
".uls": "text/iuls",
".vda": "application/x-vda",
".vml": "text/xml",
".vsd": "application/vnd.visio",
".vss": "application/vnd.visio",
".vst": "application/x-vst",
".vsx": "application/vnd.visio",
".vxml": "text/xml",
".wax": "audio/x-ms-wax",
".wb2": "application/x-wb2",
".wbmp": "image/vnd.wap.wbmp",
".wk3": "application/x-wk3",
".wkq": "application/x-wkq",
".wm": "video/x-ms-wm",
".wmd": "application/x-ms-wmd",
".wml": "text/vnd.wap.wml",
".wmx": "video/x-ms-wmx",
".wp6": "application/x-wp6",
".wpg": "application/x-wpg",
".wq1": "application/x-wq1",
".wri": "application/x-wri",
".ws": "application/x-ws",
".wsc": "text/scriptlet",
".wvx": "video/x-ms-wvx",
".xdr": "text/xml",
".xfdf": "application/vnd.adobe.xfdf",
".xls": "application/vnd.ms-excel",
".xlw": "application/x-xlw",
".xpl": "audio/scpls",
".xql": "text/xml",
".xsd": "text/xml",
".xslt": "text/xml",
".x_b": "application/x-x_b",
".sisx": "application/vnd.symbian.install",
".ipa": "application/vnd.iphone",
".xap": "application/x-silverlight-app",
".zip": "application/x-zip-compressed",
}
