python-上传下载文件

接口方式：

一、服务端接口

import flask, os,sys,time
from flask import request, send_from_directory

interface_path = os.path.dirname(__file__)
sys.path.insert(0, interface_path)  #将当前文件的父目录加入临时系统变量


server = flask.Flask(__name__)


#get方法：指定目录下载文件
@server.route('/download', methods=['get'])
def download():
    fpath = request.values.get('path', '') #获取文件路径
    fname = request.values.get('filename', '')  #获取文件名
    if fname.strip() and fpath.strip():
        print(fname, fpath)
        if os.path.isfile(os.path.join(fpath,fname)) and os.path.isdir(fpath):
            return send_from_directory(fpath, fname, as_attachment=True) #返回要下载的文件内容给客户端
        else:
            return '{"msg":"参数不正确"}'
    else:
        return '{"msg":"请输入参数"}'


# get方法：查询当前路径下的所有文件
@server.route('/getfiles', methods=['get'])
def getfiles():
    fpath = request.values.get('fpath', '') #获取用户输入的目录
    print(fpath)
    if os.path.isdir(fpath):
        filelist = os.listdir(fpath)
        files = [file for file in filelist if os.path.isfile(os.path.join(fpath, file))]
    return '{"files":"%s"}' % files


# post方法：上传文件的
@server.route('/upload', methods=['post'])
def upload():
    fname = request.files.get('file')  #获取上传的文件
    if fname:
        t = time.strftime('%Y%m%d%H%M%S')
        new_fname = r'upload/' + t + fname.filename
        fname.save(new_fname)  #保存文件到指定路径
        return '{"code": "ok"}'
    else:
        return '{"msg": "请上传文件！"}'


server.run(port=8000, debug=True)

二、客户端发送请求

import requests
import os


#上传文件到服务器
file = {'file': open('hello.txt','rb')}
r = requests.post('http://127.0.0.1:8000/upload', files=file)
print(r.text)


#查询fpath下的所有文件
r1 = requests.get('http://127.0.0.1:8000/getfiles',data={'fpath': r'download/'})
print(r1.text)


#下载服务器download目录下的指定文件
r2 = requests.get('http://127.0.0.1:8000/download',data={'filename':'hello_upload.txt', 'path': r'upload/'})
file = r2.text #获取文件内容
basepath = os.path.join(os.path.dirname(__file__), r'download/')
with open(os.path.join(basepath, 'hello_download.txt'),'w',encoding='utf-8') as f: #保存文件
    f.write(file)

非接口方式：

def upload(filename):
    #buld post body data
    boundary = '--xxxxxxxxxxxxxxxx '       http_url='http://xx.xx.com/upload.php'
    data = []
    data.append('--%s' % boundary)
    
    fp=open(filename,'rb')
    data.append('Content-Disposition: form-data; name="%s"; filename="%s"' % ('file',filename))
    data.append('Content-Type: %s\r\n' % 'text/html')
    data.append(fp.read())
    fp.close()
    data.append('--%s--\r\n' % boundary)

    http_body = '\r\n'.join(data)
    try:
        req = urllib2.Request(http_url, data=http_body)
        req.add_header('Content-Type', 'multipart/form-data; boundary=%s' % boundary)
        res = urllib2.urlopen(req, timeout=5)
        print res.read().decode('utf8')
    except Exception,e:
        print 'Error: %s' % e

再补充一下用html上传文件到服务器

 
       <head> 
      
       <link rel= 
       "shortcut icon" 
       href= 
       "favicon.ico" 
       > 
      
       <meta http-equiv= 
       "Content-Type" 
       content= 
       "text/html; charset=UTF-8" 
       > 
      
       <title>导入数据</title> 
      
       <script type= 
       "text/javascript" 
       > 
      
       function check(form) { 
      
       if 
       (form.file.value== 
       '' 
       ){ 
      
       alert( 
       '请选择要上传的文件!' 
       ); 
      
       form.file.focus(); 
      
       return 
       false 
       ; 
      
       } 
      
       return 
       true 
       ; 
      
       } 
      
       window.onload = function() { 
      
       document.form.reset(); 
      
       } 
      
       </script> 
      
       </head> 
      
       <h1 align= 
       "center" 
       >导入数据</h1> 
      
       <fieldset> 
      
       <legend><b>请选择要上传的文件: <b></legend> 
      
       <form action= 
       "http://xx.xx.com/upload.php" 
       method= 
       "post" 
       name= 
       "form" 
       enctype= 
       "multipart/form-data" 
       onsubmit= 
       "return check(this);" 
       target= 
       "result" 
       > 
      
       <input type= 
       "file" 
       name= 
       "file" 
       size=50> 
      
       <input type= 
       "submit" 
       name= 
       "upload" 
       value= 
       "上传" 
       > 
      
       </form> 
      
       </fieldset> 
      
       <iframe name= 
       "result" 
       frameborder=0 width= 
       "100%" 
       height= 
       "100%" 
       scrolling= 
       "no" 
       ></iframe>

python-上传下载文件

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