Django網站中檔案下載的實現和網頁部分列印的實現。
阿新 • • 發佈：2019-01-29
先說第一個功能檔案下載，
Django的HttpResponse直接就能提供下載，所以我們只要開啟一個檔案，讓HttpResponse返回就好了
f=open("test.txt",'r')
a=f.read()
f.close()
response=HttpResponse(a)
return response
有的檔案比較大，像上面那樣甚至有可能將系統搞崩潰，沒關係，可以像下面這樣
def readFile(fn, buf_size=262144):
f = open(fn, "rb")
while True:
c = f.read(buf_size)
if c:
yield c
else:
break
f.close()
file_name = "big_file.txt"
response = HttpResponse(readFile(file_name))
return response關於yield的用法參見http://www.cnblogs.com/tqsummer/archive/2010/12/27/1917927.html
有的時候上面這樣只能展示出來，不能啟用瀏覽器的下載，這需要做一個啟用。
在上面return response前面加上這兩行程式碼，
response['Content-Type'] = 'application/octet-stream' response['Content-Disposition'] = 'attachment;filename="{0}"'.format(file_name)
關於頁面列印
直接上程式碼吧，簡單粗暴。
<html>
<head
<script language="javascript">
function printdiv(printpage)
{
var headstr = "<html><head><title></title></head><body>";
var footstr = "</body>";
var newstr = document.all.item(printpage).innerHTML;
var oldstr = document.body.innerHTML;
document.body.innerHTML = headstr+newstr+footstr;
window.print();
document.body.innerHTML = oldstr;
return false;
}
</script
<title>div print</title>
</head>
<body>
//HTML Page
//Other content you wouldn't like to print
<input name="b_print" type="button" class="ipt" onClick="printdiv('div_print');" value=" Print ">
<div id="div_print">
<h1 style="Color:Red">The Div content which you want to print</h1>
</div>
//Other content you wouldn't like to print
//Other content you wouldn't like to print
</body>
</html>