如何在jsp頁面下載後臺伺服器返回的資料並儲存為txt格式
阿新 • • 發佈：2019-02-03
首先新建一個jsp頁面，jsp程式碼如下
<html> <head> <base href="<%=basePath%>"> <title>My JSP 'download.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is mypage"> <!-- <linkrel="stylesheet" type="text/css" href="styles.css"> --> <script type="text/javascript" src="js/jquery-1.11.1.js"></script> <script type="text/javascript"> $(document).ready(function(){ $('#downloadbtn').click(function(){ alert("click"); var taskid="11"; //$.post("downLoad",{type:"download",TaskId:taskid}); var form=$("<form id='formmodify'action='downLoad' method='post'></form>"); form.append("<input type='hidden' name='taskid' value='"+taskid+"'>"); form.submit(); }); }); </script> </head> <body> This is my JSP page. <br> <input id="downloadbtn" type="button" value="download"> </body> </html>
由jsp頁面請求伺服器後，將要請求的內容傳送至伺服器端的servlet（downLoad），伺服器知道有瀏覽器請求後，將相應的內容寫入txt檔案的輸出流，並由response返回客戶端。
後臺程式如下所示：
public void doPost(HttpServletRequestrequest, HttpServletResponseresponse) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); response.setCharacterEncoding("utf-8"); request.setCharacterEncoding("utf-8"); // 生成txt try { Date d = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_kkmmss "); String random = sdf.format(d); String targetFile = random + ".txt"; response.setContentType("application/x-msdownload"); response.addHeader("Content-Disposition", "attachment; filename=\"" + targetFile + "\""); OutputStream os = response.getOutputStream(); String temp = "你好啊！ "+random; System.out.println(temp); os.write(temp.getBytes()); os.close(); response.flushBuffer(); } catch (Exceptione) { System.out.println("生成txt檔案時出錯："); e.printStackTrace(); } }
開啟頁面點選如下所示download，請求穿回到後端伺服器
然後，後端響應後，瀏覽器提供下載，預設就儲存在了桌面
這個時候，桌面上就已經，出現了這個txt檔案
開啟txt，裡面已經存在我儲存進去的內容 “你好啊！。。”