標籤：extend file ted ring att 大小限制 建立 dir 儲存
一、jsp中：
1 <body> 2 <!-- 注意： 1. type="file"; 2.method="post" ; 3.enctype="multipart/form-data" --> 3 <form action="UploadServlet" method="post" enctype="multipart/form-data"> 4 僱員編號：<input type="text" name="empno"/><br/><br/> 5 僱員姓名：<input type="text" name="ename"/><br/><br/> 6 所在部門： 7 <select name="deptno"> 8 <option value="10">銷售部</option> 9 <option value="20">IT部</option>10 <option value="30">人力部</option>11 </select><br/><br/>12 驗證碼：<input type="text" name="code"><img id="code" alt="請重新整理" src="validateCodeServlet" onclick="changeCode()" style="cursor:hand;"><a href="javascript:changeCode()">換一張</a><br/><br/>13 14 15 頭像：<input type="file" name="uploadFile">16 <img src="${image_path}" title="${image_name}" width="200" height="200">17 <br/><br/>18 19 <input type="reset" value="重設"/> 20 <input type="submit" value="註冊"/> 21 </form>22 </body>23 </html>
二、匯入工具包
三、servlet中取得資料
package servlet;import java.io.File;import java.io.IOException;import java.util.Date;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * Servlet implementation class UploadServlet */@WebServlet("/UploadServlet")public class UploadServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //判斷上傳表單是否為multipart/form-data類型 if(ServletFileUpload.isMultipartContent(request)) { try { //1. 建立DiskFileItemFactory對象，設定緩衝區大小和臨時檔案目錄 DiskFileItemFactory factory = new DiskFileItemFactory(); //System.out.println(System.getProperty("java.io.tmpdir"));//預設臨時檔案夾 //2. 建立ServletFileUpload對象，並設定上傳檔案的大小限制。 ServletFileUpload sfu = new ServletFileUpload(factory); sfu.setSizeMax(10*1024*1024);//以byte為單位 不能超過10M 1024byte = 1kb 1024kb=1M 1024M = 1G sfu.setHeaderEncoding("utf-8"); //3. 調用ServletFileUpload.parseRequest方法解析request對象，得到一個儲存了所有上傳內容的List對象。 List<FileItem> fileItemList = sfu.parseRequest(request); Iterator<FileItem> fileItems = fileItemList.iterator(); //4. 遍曆list，每迭代一個FileItem對象，調用其isFormField方法判斷是否是上傳檔案 while(fileItems.hasNext()) { FileItem fileItem = fileItems.next(); //普通表單元素 if(fileItem.isFormField()) { String name = fileItem.getFieldName();//name屬性值 String value = fileItem.getString("utf-8");//name對應的value值 System.out.println(name + " = "+value); } //<input type="file">的上傳檔案的元素 else { String fileName = fileItem.getName();//檔案名稱 System.out.println("原檔案名稱：" + fileName);//Koala.jpg String suffix = fileName.substring(fileName.lastIndexOf(‘.‘)); System.out.println("副檔名：" + suffix);//.jpg //新檔案名稱（唯一） String newFileName = new Date().getTime() + suffix; System.out.println("新檔案名稱：" + newFileName);//image\1478509873038.jpg //5. 調用FileItem的write()方法，寫入檔案 File file = new File(request.getServletContext().getRealPath("image")+"\\"+newFileName); System.out.println(file.getAbsolutePath()); fileItem.write(file); //6. 調用FileItem的delete()方法，刪除臨時檔案 fileItem.delete(); /* * 儲存到資料庫時注意 * 1.儲存源檔案名稱 Koala.jpg * 2.儲存相對路徑 image/1478509873038.jpg * */ request.setAttribute("image_name",fileName); request.setAttribute("image_path","image/"+newFileName); request.getRequestDispatcher("/upload.jsp").forward(request, response); } } } catch (FileUploadException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } }}
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