文件下载 springmvc

下载
//实例 action

public String doDownFile( ) throws IOException {
response.setContentType("text/html;charset=UTF-8");
String fileURL = "resources/install/webview.exe";
                //session 有request.getSession()
String url = session.getServletContext().getRealPath("\\")
+ fileURL.replaceAll("/", "\\\\");
System.out.println("***************************8"+fileURL);
File file = new File(url);
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename="
+ file.getName());
response.addHeader("Content-Length", "" + file.length());
try {
// 以流的形式下载文件
InputStream fis = new FileInputStream(file);
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();

OutputStream toClient = new BufferedOutputStream(
response.getOutputStream());
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (Exception e) {
e.printStackTrace();
}
return null;}