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;
/**
* @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 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;
???}
}
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原文地址：https://www.cnblogs.com/chinaifae/p/10255574.html