commons-fileupload 上传实例

使用commons-fileupload 上传

在通过使用FileUpload组件上传的过程中，通过自己的调试，总结如下：
1）使用之前的准备，我用的是commons-fileupload-1.1-dev.jar和commons-io-1.1-dev.jar。由于在parseRequest(request)的类有关继承于DiskFileItem
类。而他有private  org.apache.commons.io.output.DeferredFileOutputStream dfos。这样的就必须使用到commons-io-1.1-dev.jar。因此需要导入该包。否则就出classNotFound：.DeferredFileOutputStream的错误。

package com.cms.ui;

import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class AddUser extends HttpServlet {
 public final static Log log = LogFactory.getLog(FileUpload.class);
 String regExp = ".+////(.+)$";
 String[] errorType = { ".exe", ".com", ".cgi", ".asp" };
 Pattern p = Pattern.compile(regExp);
 Map userInfoMap = new HashMap();

 public Map getUserInfoMap() {
  return userInfoMap;
 }

 public void setUserInfoMap(Map userInfoMap) {
  this.userInfoMap = userInfoMap;
 }

 public void destroy() {
  super.destroy();
 }
 private void processFormField(FileItem item) {
  String name = item.getFieldName();
  String value = item.getString();
  log.info(name + " : " + value);
  this.getUserInfoMap().put(name, value);
  // String submit = name;
  /*
   * username : tt password : ttttt password1 : ttttttttt sex : 1 birthday :
   * birthday_month : -1 birthday_day : -1 birthday_year : -1 tel : tt
   * email : e address : a question : answer : aaa resume : ddddd submit :
   * submit if (StringUtils.isNotEmpty(name) && StringUtils.equals(name,
   * "submit")) { String username = request.getParameter("username");
   * BasetableFactory bf = BasetableFactory.getInstance(); String sql =
   * "insert into user(username) value('" + username + "')"; if
   * (bf.insertUser(sql)) { log.info("insert user success"); } else {
   * log.info("insert user fail"); } }
   */

 }
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  String filepath = URLDecoder.decode(this.getClass().getClassLoader()
    .getResource("../../uploads").getPath(), "UTF-8");
  String tempPath = filepath + "/temp";
  log.info(filepath);
  log.info(request.getContentLength());
  log.info(request.getContentType());
  DiskFileItemFactory factory = new DiskFileItemFactory();
  factory.setSizeThreshold(4096);
  factory.setRepository(new File(tempPath));
  ServletFileUpload upload = new ServletFileUpload(factory);
  upload.setSizeMax(1000000);
  try {
   List fileItems = upload.parseRequest(request);
   Iterator iter = fileItems.iterator();
   while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();    
    if (item.isFormField()) {
     processFormField(item); 
    }else{
     processUploadedFile(item, filepath);
     //continue;
    }
   }
  } catch (FileUploadException e) {
   log.info(e);
  }
         log.info(this.getUserInfoMap());
 }

 private void processUploadedFile(FileItem item, String filepath) {
  String name = item.getName();
  long size = item.getSize();
  if ((name == null || name.equals("")) && size == 0)
   return;
  Matcher m = p.matcher(name);
  boolean result = m.find();
  if (result) {
   for (int temp = 0; temp < errorType.length; temp++) {
    if (m.group(1).endsWith(errorType[temp])) {
     log.info(name + ": wrong type");
    }
   }
   try {
    item.write(new File(filepath + "/" + m.group(1)));
    log.info(name + "/r/n" + size + "<br>");
   } catch (Exception e) {
    log.info(e);
   }

  } else {
   log.info("fail to upload");
  }
 }

 /**
  * Initialization of the servlet. <br>
  *
  * @throws ServletException
  *             if an error occure
  */
 public void init() throws ServletException {
  // Put your code here
 }

}