JSP中（jsp+servlet）实现的文件上传

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package dao; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.fileupload.util.Streams; /** * Servlet implementation class for Servlet: UploadServlet * */ public class uploadServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { File tmpDir = null;// 初始化上传文件的临时存放目录 File saveDir = null;// 初始化上传文件后的保存目录 public uploadServlet() { super(); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } @Override protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); try { if (ServletFileUpload.isMultipartContent(request)) { DiskFileItemFactory dff = new DiskFileItemFactory();// 创建该对象 dff.setRepository(tmpDir);// 指定上传文件的临时目录 dff.setSizeThreshold(1024000);// 指定在内存中缓存数据大小,单位为byte ServletFileUpload sfu = new ServletFileUpload(dff);// 创建该对象 sfu.setFileSizeMax(5000000);// 指定单个上传文件的最大尺寸 sfu.setSizeMax(10000000);// 指定一次上传多个文件的总尺寸 FileItemIterator fii = sfu.getItemIterator(request);// 解析request // 请求,并返回FileItemIterator集合 while (fii.hasNext()) { FileItemStream fis = fii.next();// 从集合中获得一个文件流 if (!fis.isFormField() && fis.getName().length() > 0) {// 过滤掉表单中非文件域 String fileName = fis.getName().substring( fis.getName().lastIndexOf("\\"));// 获得上传文件的文件名 BufferedInputStream in = new BufferedInputStream(fis .openStream());// 获得文件输入流 try{ if(getExtName(fileName,'.').equals("gif")|| getExtName(fileName,'.').equals("jpg")||getExtName(fileName,'.').equals("doc")){ BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream(new File(saveDir + fileName)));// 获得文件输出流 Streams.copy(in, out, true);// 开始把文件写到你指定的上传文件夹 response.getWriter().println("File upload successfully!!!");}// 终于成功了,还不到你的上传文件中看看,你要的东西都到齐了吗 else{response.getWriter().println("File upload failful!!!");} }catch(Exception e){ e.getMessage();} /********************后缀的实现**********************/ /* try{ for(int i=0;i<myFiles.getCount();i++){ sourceName[i]=myFiles.getFile(i).getName(); //1:myUpload.setRealPath(),saveAs(); //2:saveAs(String realPath) * if(myFiles.getFile(i).getExtName().equals("doc")) * setRealPath=application.getRealPath(File.separator+File.separator+"uploadFiles"+File.separator); * else if(myFiles.getFile(i).getExtName().equals("gif")|| * myFiles.getFile(i).getExtName().equals("jpg")) * myFiles.getFile(i).saveAs(setRealPath); * }} * catch(Exception e){throw e;} } } */ } } } } catch (Exception e) { e.printStackTrace(); } } @Override public void init() throws ServletException { /* 对上传文件夹和临时文件夹进行初始化 */ super.init(); String tmpPath = "D:\\netBean\\upload\\web\\tmpdir"; String savePath = "D:\\netBean\\upload\\web\\updir"; tmpDir = new File(tmpPath); saveDir = new File(savePath); if (!tmpDir.isDirectory()) tmpDir.mkdir(); if (!saveDir.isDirectory()) saveDir.mkdir(); } /**************************获得文件后缀名*********************/ public static String getExtName(String s, char split) { int i = s.indexOf(split); int leg = s.length(); return (i > 0 ? (i + 1) == leg ? "" : s.substring(i,s.length()) : ""); } }