文件上传

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 + "&nbsp;&nbsp;" + 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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