public HttpServletResponse download(String path, HttpServletResponse response) {
try {
// path是指欲下载的文件的路径。
File file =
new File(path);
// 取得文件名。
String filename = file.getName();
// 取得文件的后缀名。
String ext = filename.substring(filename.lastIndexOf("
.") + 1).toUpperCase();
// 以流的形式下载文件。
InputStream fis =
new BufferedInputStream(
new FileInputStream(path));
byte[] buffer =
new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.addHeader("
Content-Disposition", "
attachment;filename=" +
new String(filename.getBytes()));
response.addHeader("
Content-Length", "
" + file.length());
OutputStream toClient =
new BufferedOutputStream(response.getOutputStream());
response.setContentType("
application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
}
catch (IOException ex) {
ex.printStackTrace();
}
return response;
}
public void downloadLocal(HttpServletResponse response)
throws FileNotFoundException {
// 下载本地文件
String fileName = "
Operator.doc".toString();
// 文件的默认保存名
// 读到流中
InputStream inStream =
new FileInputStream("
c:/Operator.doc");
// 文件的存放路径
// 设置输出的格式
response.reset();
response.setContentType("
bin");
response.addHeader("
Content-Disposition", "
attachment; filename=/"" + fileName + "
/"");
// 循环取出流中的数据
byte[] b =
new byte[100];
int len;
try {
while ((len = inStream.read(b)) > 0)
response.getOutputStream().write(b, 0, len);
inStream.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
public void downloadNet(HttpServletResponse response)
throws MalformedURLException {
// 下载网络文件
int bytesum = 0;
int byteread = 0;
URL url =
new URL("
windine.blogdriver.com/logo.gif");
try {
URLConnection conn = url.openConnection();
InputStream inStream = conn.getInputStream();
FileOutputStream fs =
new FileOutputStream("
c:/abc.gif");
byte[] buffer =
new byte[1204];
int length;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
//支持在线打开文件的一种方式
public void downLoad(String filePath, HttpServletResponse response,
boolean isOnLine)
throws Exception {
File f =
new File(filePath);
if (!f.exists()) {
response.sendError(404, "
File not found!");
return;
}
BufferedInputStream br =
new BufferedInputStream(
new FileInputStream(f));
byte[] buf =
new byte[1024];
int len = 0;
response.reset();
// 非常重要
if (isOnLine) {
// 在线打开方式
URL u =
new URL("
file:///" + filePath);
response.setContentType(u.openConnection().getContentType());
response.setHeader("
Content-Disposition", "
inline; filename=" + f.getName());
// 文件名应该编码成UTF-8
}
else {
// 纯下载方式
response.setContentType("
application/x-msdownload");
response.setHeader("
Content-Disposition", "
attachment; filename=" + f.getName());
}
OutputStream out = response.getOutputStream();
while ((len = br.read(buf)) > 0)
out.write(buf, 0, len);
br.close();
out.close();
}
