java操作文件批量上传

来源：互联网发布：deepin linux 15.3 编辑：程序博客网时间：2024/05/16 10:29

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 {

// 创建文件处理工厂，它用于生成FileItem对象。

DiskFileItemFactory difactory = new DiskFileItemFactory();

// 设置缓存大小，如果上传文件超过缓存大小，将使用临时目录做为缓存。

difactory.setSizeThreshold(1024 * 1024);

// 设置处理工厂缓存的临时目录，此目录下的文件需要手动删除。

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

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

if (!filedir.exists())

filedir.mkdir();

difactory.setRepository(filedir);

// 设置文件实际保存的目录

String userdir = dir + "files";

File fudir = new File(userdir);

if (!fudir.exists())

fudir.mkdir();

// 创建request的解析器，它会将数据封装到FileItem对象中。

  ServletFileUpload sfu = new ServletFileUpload(difactory);

  sfu.setHeaderEncoding("utf-8");

// 解析保存在request中的数据并返回list集合

List list = null;

try {

list = sfu.parseRequest(request);

} catch (FileUploadException e) {

e.printStackTrace();

}

// 遍历list集合，取出每一个输入项的FileItem对象，并分别获取数据

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 {

// 由于客户端向服务器发送的文件是客户端的全路径，在这我们只需要文件名即可

    String filename = fi.getName();

    int index = filename.lastIndexOf("\\");

    if (index != -1){

     filename = filename.substring(index + 1);

     // 向服务器写出文件

     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);

     }

     // 关闭流

     if (in != null) {

      try {

       in.close();

      } finally {

       if (fos != null)

        fos.close();
      }
     }
    }
   }

}

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

}

页面

<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>请选择上传的文件：</b>
            <input id="file" name="file" type="file" size="35"><input type="button" value="添加" onclick="addRow()">
          </td>
        </tr>
        <tr style="display: none;" id="myTr">
        <td><b>请选择上传的文件：</b>
            <input id="file" name="file" type="file" size="35"><input type="button" value="删除" onclick="delRow(this)">
          </td>
        </tr>
</table>
<input name="Submit" type="submit" class="btn_grey" value="确认">
<input name="Submit2" type="button" class="btn_grey" onClick="window.close()" value="关闭">
</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