下面是我的服务器代码，我尝试在其中获取上载的文件。但是，fs.writeFile这不起作用，因此我假设我做错了什么。
server.on('request', function(request, response){
....
if((pathArray[1] == "photos") && (pathArray[2] = "new")){
var imagesPath = './images';
uploadPhoto(response, imagesPath);
}
else if(path == '/document/save'){
console.log("path: " + path);
var body = '';
request.on('data', function(data){
body += data;
});
request.on('end', function() {
var note = querystring.parse(body);
console.log("Body data: " + note);
var newPath = "./images/myimage.jpg";
fs.writeFile( newPath, body, function (err) {
if (err) throw err;
});
});
}
如果可以帮助任何人，这是我的表单HTML：
function uploadPhoto(response, imageLoc){
response.writeHead(200, {
'Content-Type': 'text/html'
});
response.write('<html><body>');
response.write('<div class="uploadFile">');
response.write('<link rel="stylesheet" type="text/css" href="style.css">');
response.write('<form action =/document/save>');
response.write('<method = "post">');
response.write('<enctype="multipart/form-data">');
response.write('<label for="name">Upload new photo</label>');
response.write('<br></br>');
response.write('<input type="file" name="name">');
response.write('<br></br>');
response.write('<button type="submit">Upload</button>');
response.write('</div>');
response.write('</body></html>');
response.write('</form>');
response.end();
}
上传文件后，URL转到/document/save/uploadImage.jpg。但是，当我尝试读取图像的内容（“主体”）以将图像保存到文件夹中然后显示它时，请求的对象的内容似乎为空。
我如何使用node.js没有express的图像或除我拥有的以外的任何其他外部库来获取图像的内容？是fs.writeFile写一个二进制文件时要使用一个很好的功能？
必须考虑的是，从上载接收的数据具有以下格式：
------WebKitFormBoundary9BhXe3lt2UddCDz9
Content-Disposition: form-data; name="document"; filename="globeSS.jpg"
Content-Type: image/jpeg
ÿØÿà JFIF d d ÿì Ducky d ÿá
//[binary binary binary...]
Ï[leñnœ“}ÛOyŠVÑ0êãXÂ}Ö'±”É iÉöÚ$GTQ7äŽø
uÚ_êÍòXgV¿Õ=€q`]aKRÐÀ
ò<ÿÙ
------WebKitFormBoundary9BhXe3lt2UddCDz9--
为了只获取二进制数据（进而是文件），程序员必须找出一种从数据中裁剪二进制数据的方法。在下面的代码中，图片的二进制文件全部保存在内存中，因此，如果用户上传特别大的文件，则以下实现可能会失败。最好尝试将文件记录在卡盘中。
request.setEncoding('binary');
//Grabbing all data from the image
var body = ''
var binaryEnd; //gets the string that indicates the location of the end of the binary file
var first = true;
request.on('data', function(data) {
if(first)
binaryEnd = data.toString().substring(0, data.toString().indexOf('\n')-1);
first = false;
body += data
});
//Dealing with the image once we have everything
request.on('end', function() {
var note = querystring.parse(body, '\r\n', ':')
console.log(note)
//making sure than an image was submitted
if (note['Content-Type'].indexOf("image") != -1)
{
//get the filename
var fileInfo = note['Content-Disposition'].split('; ');
for (value in fileInfo){
if (fileInfo[value].indexOf("filename=") != -1){
fileName = fileInfo[value].substring(10, fileInfo[value].length-1);
if (fileName.indexOf('\\') != -1)
fileName = fileName.substring(fileName.lastIndexOf('\\')+1);
console.log("My filename: " + fileName);
}
}
//Get the type of the image (eg. image/gif or image/png)
var entireData = body.toString();
var contentTypeRegex = /Content-Type: image\/.*/;
contentType = note['Content-Type'].substring(1);
//Get the location of the start of the binary file,
//which happens to be where contentType ends
var upperBoundary = entireData.indexOf(contentType) + contentType.length;
var shorterData = entireData.substring(upperBoundary);
//replace trailing and starting spaces
var binaryDataAlmost = shorterData.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
//Cut the extra things at the end of the data (Webkit stuff)
var binaryData = binaryDataAlmost.substring(0, binaryDataAlmost.indexOf(firstLine));
//Write to a file
fs.writeFile('./images/' + fileName , binaryData, 'binary', function(err)
{
//forward to another location after writing data
response.writeHead(302, {
'location':'/index.html'
});
response.end();
});
}
else
respond(404, "Please input an image", response);
});
这应该在所有浏览器中都可以使用（请注意，Internet Explorer不会使用来限制其数据------WebkitFormBoundary，而是使用其他方式来限制（我认为只是-----，但我忘记了。）
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