原理：利用servlet，IO流，实现数据的传输。
1.dorado中创建RequestCommand，其中path指向servlet
2.创建导出servlet，并自定义导出方法
public class LoadFile extends HttpServlet {
@Override
public void init() {
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String fileName = "******.txt";
String str = "****************";//导出内容
ServletOutputStream sos = null;
try {//设置文件名编码格式
fileName = java.net.URLEncoder.encode(fileName, "utf-8");
} catch (UnsupportedEncodingException e1) {
throw new RuntimeException("不支持的编码格式！！！");
}
try{
response.reset();//必须加，不然保存不了临时文件
response.setContentType("application/octet-stream");//设置文件内容格式，防止浏览器自动打开
response.addHeader("Content-Disposition", "attachment; filename=" + fileName);//设置下载的文件名
//输出流
sos = response.getOutputStream();
sos.write(str.getBytes());
} catch (IOException e) {
throw new RuntimeException(e.getMessage());
} finally{
sos.flush();
sos.close();
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp);
}
}
3.在web.xml中配置servlet
<servlet>
<servlet-name>LoadFile</servlet-name>
<servlet-class>com.fenet.insurance.mm.invoicemanage.action.LoadFile</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoadFile</servlet-name>
<url-pattern>/LoadFile</url-pattern>
</servlet-mapping>