using NPOI.XWPF.UserModel
XWPFDocument doc = new XWPFDocument(); //创建新的word文档
XWPFParagraph p1 = doc.CreateParagraph(); //向新文档中添加段落
p1.SetAlignment(ParagraphAlignment.CENTER); //段落对其方式为居中
XWPFRun r1 = p1.CreateRun(); //向该段落中添加文字
r1.SetText("测试段落一");
XWPFParagraph p2 = doc.CreateParagraph();
p2.SetAlignment(ParagraphAlignment.LEFT);
XWPFRun r2 = p2.CreateRun();
r2.SetText("测试段落二");
r2.SetFontSize(16);//设置字体大小
r2.SetBlod(true);//设置粗体
FileStream sw = File.Create("cutput.docx"); //...
doc.Write(sw); //...
sw.Close(); //在服务端生成文件
FileInfo file = new FileInfo("cutput.docx");//文件保存路径及名称
//注意: 文件保存的父文件夹需添加Everyone用户，并给予其完全控制权限
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.ContentType = "application/octet-stream";
Response.AppendHeader("Content-Disposition", "attachment;filename="
+ HttpUtility.UrlEncode("output.docx", System.Text.Encoding.UTF8));
Response.AppendHeader("Content-Length", file.Length.ToString());
Response.WriteFile(file.FullName);
Response.Flush(); //以上将生成的word文件发送至用户浏览器
File.Delete("cutput.docx");