一个tornado框架下的文件上传案例

• html部分----使用了form表单，注意三要素 method="post"  action="/loaddata" enctype="multipart/form-data"

<form method="post" id="postform" action="/loaddata" enctype="multipart/form-data">
      <div class="pricing-header px-3 py-3 pt-md-5 pb-md-4 mx-auto text-center">
        <h3 class="display-4">选择要读取的文件</h3>
        <p class="lead">
          <input type="file" name="damnfile" id="excelfile" class="form-control">
        </p>
      </div>
      <div class="container">
      <div class="card-deck mb-6 text-center">
          <div class="card mb-6 box-shadow">
          <div class="card-header">
            <h4 class="my-0 font-weight-normal">Free</h4>
          </div>
            <div class="card-body"  style="height:600px">
            <h1 class="card-title pricing-card-title">$0 <small class="text-muted">/ mo</small></h1>
                <textarea cols="100%" rows="18">
                </textarea>
            <button type="submit" id="postbtn" class="btn btn-lg btn-block btn-outline-primary">Sign up for free</button>
          </div>
        </div>
      </div>

      <footer class="pt-4 my-md-5 pt-md-5 border-top">
        <div class="row">
          <div class="col-12 col-md">
            <img class="mb-2" src="https://getbootstrap.com/assets/brand/bootstrap-solid.svg" alt="" width="24" height="24">
            <small class="d-block mb-3 text-muted">&copy; 2017-2018</small>
          </div>
          <div class="col-6 col-md">
            <h5>Features</h5>
            <ul class="list-unstyled text-small">
              <li><a class="text-muted" href="#">Cool stuff</a></li>
              <li><a class="text-muted" href="#">Random feature</a></li>
              <li><a class="text-muted" href="#">Team feature</a></li>
              <li><a class="text-muted" href="#">Stuff for developers</a></li>
              <li><a class="text-muted" href="#">Another one</a></li>
              <li><a class="text-muted" href="#">Last time</a></li>
            </ul>
          </div>
          <div class="col-6 col-md">
            <h5>Resources</h5>
            <ul class="list-unstyled text-small">
              <li><a class="text-muted" href="#">Resource</a></li>
              <li><a class="text-muted" href="#">Resource name</a></li>
              <li><a class="text-muted" href="#">Another resource</a></li>
              <li><a class="text-muted" href="#">Final resource</a></li>
            </ul>
          </div>
          <div class="col-6 col-md">
            <h5>About</h5>
            <ul class="list-unstyled text-small">
              <li><a class="text-muted" href="#">Team</a></li>
              <li><a class="text-muted" href="#">Locations</a></li>
              <li><a class="text-muted" href="#">Privacy</a></li>
              <li><a class="text-muted" href="#">Terms</a></li>
            </ul>
          </div>
        </div>
      </footer>
    </div>
    </form>

• python部分

class loaddata(RequestHandler):
        def post(self):
        sourcefile =self.request.files['damnfile']
        print(type(sourcefile))
        for i in sourcefile:
            print(i)
        for meta in sourcefile:
            filename = meta['filename']
            import os
            import time
            #realpath = os.path.(__file__)
            #print(realpath)
            with open("E:\\"+filename ,"wb") as writer:
                writer.write(meta['body'])