fileupload上传代码与txt文件取值实例.doc

Fileupload 上传一般的上传下载相信大家都会得。最近做了一个txt文件的读取，原本简单的事情，结果想了一个下午，只因逻辑思维错误。下面就跟大家说一下这个功能的实现以及利用fileupload上传文件的快速开发。功能：按一定的规则读取一个txt文件里面的内容。首先我们先到网上下载两个包：commons-fileupload-1.2.2.jar commons-io-2.1.jar有了这两个包之后我们就可以利用fileupload控件来上传文件到服务器了。下面代码是上传代码【UploadUtil类】（通用代码，大家可以直接拷贝过去用）import java.io.File;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.Iterator;import java.util.List;import javax.servlet.http.HttpServletRequest;import mons.fileupload.FileItem;import mons.fileupload.disk.DiskFileItemFactory;import mons.fileupload.servlet.ServletFileUpload;public class UploadUtilpublic static final long serialVersionUID =0L;SuppressWarnings(unchecked)public static List upload(HttpServletRequest request,String targetFolder)List files = new ArrayList();File targetFile = new File(request.getSession().getServletContext().getRealPath(targetFolder);/获取向项目路径File temFile = new File(request.getSession().getServletContext().getRealPath(/temp);/获取项目路劲临时目录if(!targetFile.exists()targetFile.mkdirs();if(!temFile.exists()temFile.mkdirs();try if(ServletFileUpload.isMultipartContent(request)DiskFileItemFactory factory = new DiskFileItemFactory();factory.setSizeThreshold(3000000);factory.setRepository(temFile);ServletFileUpload upload = new ServletFileUpload(factory);upload.setHeaderEncoding(UTF-8);upload.setSizeMax(3000000);/ Parse the requestList items = upload.parseRequest(request);Iterator iter = items.iterator();while (iter.hasNext() FileItem item = (FileItem) iter.next(); String fileName = item.getName(); if(!item.isFormField() if(fileName!=null&!fileName.isEmpty() int dot = fileName.lastIndexOf(.); fileName = fileName.substring(dot); fileName = item.getFieldName()+_+rename()+fileName; File uploadedFile = new File(targetFile,fileName); item.write(uploadedFile); files.add(uploadedFile.getAbsolutePath(); return files;catch(Exception e)if(files!=null&!files.isEmpty()for(String fileName:files) File file = new File(fileName); if(file.exists() file.delete(); e.printStackTrace(); return null;/* * 获取时间 命名文档 * return */private static String rename() String name=; SimpleDateFormat sdf = new SimpleDateFormat(yyyyMMddHHmmss); Date date = new Date(); name=sdf.format(date); name = name+Math.random()*10; return name; 有了这个类之后我们是否就可以直接能上传文件了呢？还不行，我们还要设置一下jsp页面。下面是jsp页面的代码。可供大家测试参考用（其中form中 enctype=multipart/form-data 必须要加上）。      OK,现在我们把jsp 也弄好了，我们看看我们要提交的的表单到那个类里面吧在这里我用的servlet，from 表单直接提交给一个UploadDevice servlet类，上面我们已经写好了上传的类了，那么我们在UploadDevice 就可以直接调用UploadUtil了。下面就是UploadDecice 类代码：public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException List files = UploadUtil.upload(request, /bridge);/ 调用UploadUtile类方法上传文档/* * 读取文档 */ String read; FileReader fileread; System.out.println(files.get(0); File filename = new File(files.get(0);/读取txt文件 try List bridgeList = new ArrayList(); fileread = new FileReader(filename); bufread = new BufferedReader(fileread); try while (read = bufread.readLine() != null) String as = read.toString(); String aa = as.split();/按tab来进行分析 bridgeList.add(aa); if(null != bridgeList) String message = deviceManagerDao.addDeviceList(bridgeList); System.out.println(message); request.setAttribute(message, message); catch (IOException e) e.printStackTrace(); catch (FileNotFoundException e) e.printStackTrace(); finally if(filename.isFile() & file