java基礎點薈萃

1 web 1.1 檔案下載 1.1.1 用戶端

var url = "/services/fileServlet";url += "?beanId=" + beanId;url += "&method=" + method;url += "&params=" + $.toJSON(params);var frame = document.getElementById("downloadHideFrame");if (!frame) {$("body").append("<iframe id='downloadHideFrame' name='downloadHideFrame' src='' width=0 height=0></iframe>");}window.open(url, 'downloadHideFrame');

1.1.2 服務端

主要要注意 Content-Disposition，ContentLength 和 ContentType。

protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String beanId = request.getParameter("beanId");String method = request.getParameter("method");String params = request.getParameter("params");Object[] objects = JSONOperUtils.JSONToArray(params);Object bean = BeanFactory.getBean(beanId);File file = null;try {file = (File) MethodUtils.invokeMethod(bean, method, objects);} catch (Exception e) {e.printStackTrace();}//檔案名稱response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());response.setContentLength((int) file.length());response.setContentType("application/zip");InputStream in = null;try {in = new BufferedInputStream(new FileInputStream(file));FileCopyUtils.copy(in, response.getOutputStream());response.flushBuffer();} catch (Exception e) {e.printStackTrace();} finally {FileUtils.closeQuietly(in);file.delete();}}