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;  }}