用FileUpload实现文件上传

来源：互联网发布：自动开票软件编辑：程序博客网时间：2024/04/30 23:02

用apache的一个开源项目fileupload可以轻松的实现文件的上传，目前的最新版本是commons-fileupload-1.2，可以到apache的网站下载

import java.io.File;

import java.util.Iterator;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.MappingDispatchAction;

import org.apache.commons.fileupload.*;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadFile extends MappingDispatchAction ...{

private static final int FILE_SIZE = 4194304;

public ActionForward upload(ActionMapping mapping, ActionForm form,

HttpServletRequest request,HttpServletResponse response) ...{

try ...{

DiskFileItemFactory fc = new DiskFileItemFactory();

//设置文件的最大限度，如果超出这个限度，则将文件写入磁盘

fc.setSizeThreshold(4000);

//文件超过最大限度时，写入磁盘的临时路径

fc.setRepository(new File("E: mp"));

ServletFileUpload fu = new ServletFileUpload(fc);

//设置最大文件尺寸，单位为字节，这里是4MB

fu.setSizeMax(FILE_SIZE);

//得到所有的文件：

List fileItems = fu.parseRequest(request);

Iterator i = fileItems.iterator();

//依次处理每一个文件：

while(i.hasNext()) ...{

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

//获得文件名，这个文件名包括路径：

String fileName = fi.getName();

if (fi.getSize() > FILE_SIZE)

throw new Exception("File is too large!");

fileName = fileName.substring(fileName.lastIndexOf("") + 1, fileName.length());

//写入文件

fi.write(new File("e: mps" + fileName));

}

} catch (Exception e) ...{

// TODO Auto-generated catch block

e.printStackTrace();

return mapping.findForward("uploadFail");

}

return mapping.findForward("success");

}

页面代码：

<%...@ page pageEncoding="utf-8"%>

<html>

<body>

选择文件路径：

</center>

</form>

</body>

</html>