java 获得http下载文件的真实名称

有两种获取链接文件名的方法：

第一种：从连接URL，从描述中获取

第二种：如果第一种获取不到，可以从URL地址中获取

比如这种地址：

http://book.booktxt.com/txtbuk/20130421/xuanhuan/20130421133601180.rar

你在后台设置一个，

<%

response.setContentType(fileminitype)

response.setHeader("Location",filename)

response.setHeader("Cache-Control", "max-age=" + cacheTime)

response.setHeader("Content-Disposition", "attachmentfilename=" + filename)//filename应该是编码后的(utf-8)

response.setContentLength(filelength)

OutputStream outputStream = response.getOutputStream()

InputStream inputStream = new FileInputStream(filepath)

byte[] buffer = new byte[1024]

int i = -1

while ((i = inputStream.read(buffer)) != -1) {

outputStream.write(buffer, 0, i)

}

outputStream.flush()

outputStream.close()

inputStream.close()

outputStream = null

%>