JavaWeb文件下载功能实例代码

在工作中遇到的一个下载文件的功能，自己将其抽取出来，代码简单，希望能帮到大家，好了，话不多说，上代码！

public void downloadfile(file file, string downname, httpservletrequest request, httpservletresponse response) {
 outputstream out = null;
 fileinputstream fin = null;
 bufferedinputstream bin = null;
 try {
  if (file.exists()) {
  string finalfilename = null;
  string agent = request.getheader("user-agent");
  boolean ismsie = (agent != null && agent.indexof("msie") != -1);
  if (ismsie) {
   finalfilename = urlencoder.encode(downname, "utf8");
  } else {
   finalfilename = new string(downname.getbytes("utf-8"), "iso-8859-1");
  }
  response.setcontenttype("application/x-msdownload");
  response.setheader("content-disposition", "attachment; filename=".concat(finalfilename));
  out = response.getoutputstream();
  fin = new fileinputstream(file);
  bin = new bufferedinputstream(fin);
  for (int data = bin.read(); data > -1; data = bin.read()) {
   out.write(data);
  }
  } else {
  }
 } catch (exception e) {
  e.printstacktrace();
 } finally {
  try {
  if (bin != null)
   bin.close();
  if (fin != null)
   fin.close();
  if (out != null)
   out.close();
  } catch (exception e2) {
  e2.printstacktrace();
  }
 }
 }

以上就是本文javaweb文件下载的代码，希望对大家的学习有所帮助，也希望大家多多支持。