由于以前一直是用的smartupload，自己写了个，写的不好，还请包涵：）

/**
 *@discription 一个用于上传的类，可以用于任何类型的上传。
 *@package com.tools.manage
 *@author  李国庆
 *@company  LEEMENZ
 *@version  1.0.0
 *
 */
package com.tools.manage;

import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;

/**
 * @author Administrator
 *
 */
public class Upload {

 private ServletRequest request;

 private ServletResponse response;

 private ServletConfig config;

 private ServletInputStream DATA;

 private int FormSize;

 private File file;

 private FileOutputStream foutput;

 private DataInputStream dinput;

 private String filename;

 private byte[] b;

 private byte t;

 private boolean flag = false;

 public Upload() {
 }

 /**
  * @description            初始化上下文配置
  * @param config           上下文配置
  * @param request          HttpServletRequest
  * @param response         HttpServletResponse
  * @throws IOException     抛出IO异常
  */
 public void initialize(ServletConfig config, HttpServletRequest request,
   HttpServletResponse response) throws IOException {
  this.request = request;
  this.config = config;
  this.response = response;
  this.DATA = request.getInputStream();
  this.FormSize = request.getContentLength();
 }

 /**
  * @description            初始化上下文
  * @param pageContext      上下文文件
  * @throws IOException     抛出IO异常
  */
 public void initialize(PageContext pageContext) throws IOException {
  this.request = pageContext.getRequest();
  this.response = pageContext.getResponse();
  this.config = pageContext.getServletConfig();
  this.DATA = request.getInputStream();
  this.FormSize = request.getContentLength();
 }

 /**
  * @description            设置文件名
  * @param str              传入的文件名字符串
  * @return                 返回boolean类型的值
  */
 public boolean setFileName(String str) {
  try {
   File file = new File(str);
   foutput = new FileOutputStream(file);
  } catch (IOException e) {
   e.printStackTrace();
   return false;
  }
  return true;
 }

 /**
  * @description   将读入的数据对象以字节的方式存放到内存中
  *
  */
 public void getByte() {
  int i = 1;
  try {
   dinput = new DataInputStream(DATA);
   b = new byte[FormSize];
   while (true) {
    try {
     t = dinput.readByte();
     b[i] = t;
     i++;
    } catch (EOFException e) {
     // TODO: handle exception
     break;
    }
   }
   dinput.close();
  } catch (IOException e) {
   // TODO: handle exception
   e.printStackTrace();
  }
 }

 /**
  * @description         以ISO8859-1标准保存文件
  * @return              保存成功的标志
  */
 public boolean save() {
  int start1 = 0, start2 = 0;
  String temp = "";
  if (!flag) {
   getByte();
   flag = true;
  }
  try {
   temp = new String(b, "ISO8859-1");
  } catch (UnsupportedEncodingException e) {
   // TODO: handle exception
   return false;
  }
  start1 = temp.indexOf("image/");
  temp = temp.substring(start1);

  start1 = temp.indexOf(" ");

  temp = temp.substring(start1 + 4);
  start2 = temp.indexOf(";       ");
  if (start2 != -1) {
   temp = temp.substring(0, start2);
  }
  try {
   byte[] img = temp.getBytes("ISO8859-1");
   for (int j = 0; j < img.length; j++) {
    foutput.write(img[j]);
   }
   foutput.close();
  } catch (IOException e) {
   // TODO: handle exception
   return false;
  }
  return true;
 }

 /**
  * @description        在物理存储上创建文件夹
  * @param pathOld      存放物理位置
  * @param pathNew      在相应的物理位置下要创建的文件夹名称或序列
  * @return string      返回创建好的文件夹的物理位置绝对路径       
  */
 public String MAKE_DIR(String pathOld, String pathNew) {
  try {
   if (!(new File(pathOld).isDirectory())) {
    new File(pathOld);
    new File(pathOld + "/" + pathNew).mkdirs();
   } else {
    new File(pathOld + "/" + pathNew).mkdirs();
   }
  } catch (SecurityException e) {
   System.out.println("can not create directory");
  }
  return "/" + pathNew + "/";
 }

}

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