Java FileUploadUtil工具类 Java FileUploadUtil工具类详解

package com.gootrip.util;

import java.io.File;
import java.util.*;
import org.apache.commons.fileupload.*;
import javax.servlet.http.HttpServletRequest;
import java.util.regex.Pattern;
import java.io.IOException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import java.util.regex.Matcher;

public class FileUploadUtil {

  //当上传文件超过限制时设定的临时文件位置，注意是绝对路径
  private String tempPath = null;

  //文件上传目标目录，注意是绝对路径
  private String dstPath = null;

  //新文件名称，不设置时默认为原文件名
  private String newFileName = null;
  //获取的上传请求
  private HttpServletRequest fileuploadReq = null;

  //设置最多只允许在内存中存储的数据,单位:字节，这个参数不要设置太大
  private int sizeThreshold = 4096;

  //设置允许用户上传文件大小,单位:字节
  //共10M
  private long sizeMax = 10485760;

  //图片文件序号
  private int picSeqNo = 1;

  private boolean isSmallPic = false;

  public FileUploadUtil(){
  }

  public FileUploadUtil(String tempPath, String destinationPath){
    this.tempPath = tempPath;
    this.dstPath = destinationPath;
  }

  public FileUploadUtil(String tempPath, String destinationPath, HttpServletRequest fileuploadRequest){
    this.tempPath  = tempPath;
    this.dstPath = destinationPath;
    this.fileuploadReq = fileuploadRequest;
  }

  /** 文件上载
   * @return true —— success; false —— fail.
   */
  public boolean Upload(){
    DiskFileItemFactory factory = new DiskFileItemFactory();

    try {

      //如果没有上传目的目录，则创建它
      FileUtil.makeDirectory(dstPath+"/ddd");
      /*if (!FileUtil.makeDirectory(dstPath+"/ddd")) {
        throw new IOException("Create destination Directory Error.");
      }*/
      //如果没有临时目录，则创建它
      FileUtil.makeDirectory(tempPath+"/ddd");
      /*if (!FileUtil.makeDirectory(tempPath+"/ddd")) {
        throw new IOException("Create Temp Directory Error.");
      }*/

      //上传项目只要足够小，就应该保留在内存里。
      //较大的项目应该被写在硬盘的临时文件上。
      //非常大的上传请求应该避免。
      //限制项目在内存中所占的空间，限制最大的上传请求，并且设定临时文件的位置。

      //设置最多只允许在内存中存储的数据,单位:字节
      factory.setSizeThreshold(sizeThreshold);
      // the location for saving data that is larger than getSizeThreshold()
      factory.setRepository(new File(tempPath));

      ServletFileUpload upload = new ServletFileUpload(factory);
      //设置允许用户上传文件大小,单位:字节
      upload.setSizeMax(sizeMax);

      List fileItems = upload.parseRequest(fileuploadReq);
      // assume we know there are two files. The first file is a small
      // text file, the second is unknown and is written to a file on
      // the server
      Iterator iter = fileItems.iterator();

      // 正则匹配，过滤路径取文件名
      String regExp = ".+\\\\(.+)$";

      // 过滤掉的文件类型
      String[] errorType = {".exe", ".com", ".cgi", ".asp", ".php", ".jsp"};
      Pattern p = Pattern.compile(regExp);
      while (iter.hasNext()) {
        System.out.println("++00++====="+newFileName);
        FileItem item = (FileItem) iter.next();
        //忽略其他不是文件域的所有表单信息
        if (!item.isFormField()) {
          String name = item.getName();
          System.out.println("++++====="+name);
          long size = item.getSize();
          //有多个文件域时，只上传有文件的
          if ((name == null || name.equals("")) && size == 0)
            continue;
          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])) {
                throw new IOException(name + ": Wrong File Type");
              }
            }
            String ext = "."+FileUtil.getTypePart(name);
            try {
              //保存上传的文件到指定的目录
              //在下文中上传文件至数据库时，将对这里改写
              //没有指定新文件名时以原文件名来命名
              if (newFileName == null || newFileName.trim().equals(""))
              {
                item.write(new File(dstPath +"/"+ m.group(1)));
              }
              else
              {
                String uploadfilename = "";
                if (isSmallPic)
                {
                  uploadfilename = dstPath +"/"+ newFileName+"_"+picSeqNo+"_small"+ext;
                }
                else
                {
                  uploadfilename = dstPath +"/"+ newFileName+"_"+picSeqNo+ext;
                }
                //生成所有未生成的目录
                System.out.println("++++====="+uploadfilename);
                FileUtil.makeDirectory(uploadfilename);
                //item.write(new File(dstPath +"/"+ newFileName));
                item.write(new File(uploadfilename));
              }
              picSeqNo++;
              //out.print(name + "  " + size + "<br>");
            } catch (Exception e) {
              //out.println(e);
              throw new IOException(e.getMessage());
            }
          } else {
            throw new IOException("fail to upload");
          }
        }
      }
    } catch (IOException e) {
      System.out.println(e);
    } catch (FileUploadException e) {
      System.out.println(e);
    }
    return true;
  }

  /**从路径中获取单独文件名
   * @author
   *
   * TODO 要更改此生成的类型注释的模板，请转至
   * 窗口 － 首选项 － Java － 代码样式 － 代码模板
   */
  public String GetFileName(String filepath)
  {
    String returnstr = "*.*";
    int length    = filepath.trim().length();

    filepath = filepath.replace('\\', '/');
    if(length >0)
    {
      int i = filepath.lastIndexOf("/");
      if (i >= 0)
      {
        filepath = filepath.substring(i + 1);
        returnstr = filepath;
      }
    }
    return returnstr;
  }
  /**
   * 设置临时存贮目录
   */
  public void setTmpPath(String tmppath)
  {
    this.tempPath = tmppath;
  }
  /**
   * 设置目标目录
   */
  public void setDstPath(String dstpath) {
    this.dstPath = dstpath;
  }
  /**
   * 设置最大上传文件字节数，不设置时默认10M
   */
  public void setFileMaxSize(long maxsize) {
    this.sizeMax = maxsize;
  }
  /**
   * 设置Http 请求参数，通过这个能数来获取文件信息
   */
  public void setHttpReq(HttpServletRequest httpreq) {
    this.fileuploadReq = httpreq;
  }
  /**
   * 设置Http 请求参数，通过这个能数来获取文件信息
   */
  public void setNewFileName(String filename) {
    this.newFileName = filename;
  }

  /**
   * 设置此上传文件是否是缩略图文件，这个参数主要用于缩略图命名
   */
  public void setIsSmalPic(boolean isSmallPic) {
    this.isSmallPic = isSmallPic;
  }

  /**
   * 设置Http 请求参数，通过这个能数来获取文件信息
   */
  public void setPicSeqNo(int seqNo) {
    this.picSeqNo = seqNo;
  }


}