在jsp页面点击按钮后弹出保存对话框

jsp页面代码：

批量导出

servlet中代码：
@WebServlet("/UserManageServlet")
public class UserManageServlet extends BaseServlet{
public String exportUser(HttpServletRequest request, HttpServletResponse response) throws Exception{
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition","attachment;filename=test.txt");
ServletOutputStream  sos  =  response.getOutputStream();
sos.write("Life Is a Test. It Is Only a Test");//这里可以从输入流中得到数据然后写到指定文件中
sos.flush();
sos.close();
}
}