Servlet文件下载

通过servlet下载数据

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {
String path = this.getServletContext().getRealPath("/download/张三3.jpg");
String filename = path.substring(path.lastIndexOf("\\") + 1);
System.out.println(filename);
response.setHeader("Content-Disposition", "attachment;filename="
+ URLEncoder.encode(filename, "UTF-8"));
InputStream in = null;
OutputStream out = null;
try {
in = new FileInputStream(path);
int len = 0;
byte buffer[] = new byte[1024];
out = response.getOutputStream();
while ((len = in.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
} finally {
if (in != null) {
try {
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}


if (out != null) {
try {
in.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}