1. 程式人生 > >java操作檔案批量上傳

java操作檔案批量上傳

package com.fangdi.landaudit.process.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
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;

public class UploadFile extends HttpServlet {

 /**
  *
  */
 private static final long serialVersionUID = 1L;

 public UploadFile() {
  super();
 }

 /**
  * Destruction of the servlet. <br>
  */
 public void destroy() {
  super.destroy(); // Just puts "destroy" string in log
  // Put your code here
 }

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  out
    .println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
  out.println("<HTML>");
  out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
  out.println("  <BODY>");
  out.print("    This is ");
  out.print(this.getClass());
  out.println(", using the GET method");
  out.println("  </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  // 建立檔案處理工廠,它用於生成FileItem物件。

  DiskFileItemFactory difactory = new DiskFileItemFactory();

  // 設定快取大小,如果上傳檔案超過快取大小,將使用臨時目錄做為快取。

  difactory.setSizeThreshold(1024 * 1024);

  // 設定處理工廠快取的臨時目錄,此目錄下的檔案需要手動刪除。

  String dir = this.getServletContext().getRealPath("/");

  File filedir = new File(dir + "filetemp");

  if (!filedir.exists())

   filedir.mkdir();

  difactory.setRepository(filedir);

  // 設定檔案實際儲存的目錄

  String userdir = dir + "files";

  File fudir = new File(userdir);

  if (!fudir.exists())

   fudir.mkdir();

  // 建立request的解析器,它會將資料封裝到FileItem物件中。

  ServletFileUpload sfu = new ServletFileUpload(difactory);
  
  sfu.setHeaderEncoding("utf-8");


  // 解析儲存在request中的資料並返回list集合

  List list = null;

  try {

   list = sfu.parseRequest(request);

  } catch (FileUploadException e) {

   e.printStackTrace();

  }

  // 遍歷list集合,取出每一個輸入項的FileItem物件,並分別獲取資料

  for (Iterator it = list.iterator(); it.hasNext();) {

   FileItem fi = (FileItem) it.next();

   if (fi.isFormField()) {

    System.out.println(fi.getFieldName());

    System.out.println(fi.getString());

   } else {

    // 由於客戶端向伺服器傳送的檔案是客戶端的全路徑,在這我們只需要檔名即可

    String filename = fi.getName();
    
    int index = filename.lastIndexOf("\\");

    if (index != -1){
     
     filename = filename.substring(index + 1);
     
     // 向伺服器寫出檔案
     
     InputStream in = fi.getInputStream();
     
     FileOutputStream fos = new FileOutputStream(fudir + "/"
       + filename);
     
     byte[] buf = new byte[1024];
     
     int len = -1;
     
     while ((len = in.read(buf)) != -1) {
      
      fos.write(buf, 0, len);
      
     }
     
     // 關閉流
     
     if (in != null) {
      
      try {
       
       in.close();
       
      } finally {
       
       if (fos != null)
        
        fos.close();
      }
     }
    }
   }

  }

 }

 public void init() throws ServletException {
  // Put your code here
 }

}

頁面

<body topmargin="0" leftmargin="0" rightmargin="0" marginheight="0" marginwidth="0">
<form name="form2" enctype="multipart/form-data" method="post" action="<%=path%>/servlet/UploadFile">
<table border="0" cellpadding="0" cellspacing="0">
    <tr>
          <td><b>請選擇上傳的檔案:</b>
            <input id="file" name="file" type="file" size="35"><input type="button" value="新增" onclick="addRow()">
          </td>
        </tr>
        <tr style="display: none;" id="myTr">
         <td><b>請選擇上傳的檔案:</b>
            <input id="file" name="file" type="file" size="35"><input type="button" value="刪除" onclick="delRow(this)">
          </td>
        </tr>
</table>
<input name="Submit" type="submit" class="btn_grey" value="確認">
<input name="Submit2" type="button" class="btn_grey" onClick="window.close()" value="關閉">
</form>
</body>
<script type="text/javascript">
function addRow()
{
 var tr = document.getElementById("myTr");
 var con = tr.cloneNode(true); 
 con.removeAttribute("style");
 tr.parentNode.insertAdjacentElement("beforeEnd",con); 
}
function delRow(obj)
{
 var tr=obj.parentNode.parentNode;   
 tr.parentNode.removeChild(tr); 
}
</script>

commons-fileupload-1.2.1.jar   commons-io-1.4.jar