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struts 实现文件上传与下载

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struts 实现文件上传与下载
/*******************************************************************************
* 文件名: FileUploadAction.java <br>
* 版本: <br>
* 描述: 一个文件上传，下载的Action,继承于BaseAcion <br>
* 版权所有: <br>
* //////////////////////////////////////////////////////// <br>
* 创建者: 赵志强 <br>
* 创建日期: 2005-10-28 <br>
* 修改日期: 2005-11-3 <br>
* 修改说明: 添加gotoUpload方法,用户通过此方法跳转到upload.vm <br>
******************************************************************************/
package com.css.action;

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.BufferedOutputStream;
import java.io.BufferedInputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;
import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.*;
import org.apache.struts.validator.DynaValidatorForm;

import com.css.bean.FileInfoDTO;
import com.css.dao.DAOFactory;
import com.css.dao.FileInfoDAO;
import com.css.exception.BaseException;
import com.css.util.db.DBConfig;
import com.css.bean.UserDTO;

/**
* @author WANG
*
* Java － 代码样式 － 代码模板
*/
public class FileUploadAction extends BaseAction {

public ActionForward fileUpload(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws BaseException {

//将字符统一为gb2312
/*
* String encoding = request.getCharacterEncoding(); if ((encoding !=
* null) && (encoding.equalsIgnoreCase("utf-8"))) {
* //如果没有指定编码，编码格式为gb2312 response.setCon*("text/html; charset=gb2312"); }
*/

//取得DynaValidatorForm的值,通过theFile.get("FileUploadForm")取得上传的文件
DynaValidatorForm fileUploadForm = (DynaValidatorForm) form;
FormFile file = null;
file = (FormFile) fileUploadForm.get("theFile");
String describe = fileUploadForm.getString("describe");
String permit = fileUploadForm.getString("permit");

//设置用户权限不足时出现的错误,用户将跳转到download.vm--FileUpload.do?act=showFile
UserDTO userDTO = getSessionObj(request);
if (userDTO == null) {
this.setSysMessage(request, "login.failAdmin", "btn.readmin",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}

//获取FormFile的实例fileName中的两个属性
String fileName = file.getFileName();//取得文件名

//测试该文件是不是合法
if(!isValidFile(fileName))
{
this.setSysMessage(request, "upload.badtype", "btn.reupload",
"FileUpload.do?act=gotoUpload");
return mapping.findForward("error");
}
int fileSize = file.getFileSize();//取得文件尺寸

//通过getInputStream()方法取得文件流
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
InputStream is = null;
OutputStream fos = null;

try {
is = (InputStream) file.getInputStream();//把文件读入
bis = new BufferedInputStream(is);
String filePath = getUploadDir();//取当前系统路径
fos = new FileOutputStream(filePath + fileName);//建立一个上传文件的输出流
bos = new BufferedOutputStream(fos);
//System.out.println(filePath + fileName);

//文件最大限额
int fileMaxSize = 10 * 1024 * 1024;

if (fileSize > fileMaxSize) {
//文件大小不能超过fileMaxSize，如果超过，报"上传文件尺寸超过10M"错误；
this.setSysMessage(request, "upload.max", "btn.reupload",
"FileUpload.do?act=gotoUpload");
return mapping.findForward("error");
}
int bytesRead = 0;
byte[] buffer = new byte[5 * 1024];
while ((bytesRead = bis.read(buffer)) != -1) {
bos.write(buffer, 0, bytesRead);//将文件写入服务器
}
}
catch (IOException e) {
//设置文件物理上传出现问题时的出现的错误信息
this.setSysMessage(request, "upload.failed", "btn.reupload",
"FileUpload.do?act=gotoUpload");
return mapping.findForward("error");
}
finally {
if (bos != null) {

try {
bos.close();
}
catch (IOException e) {
System.err.print(e);
}
}
if (bis != null) {
try {
bis.close();
}
catch (IOException e) {
System.err.print(e);
}
}

}
//文件物理上传完成
//将文件信息添加到数据库
//填充FileInfoDTO
FileInfoDTO dto = new FileInfoDTO();
dto.setCheckType("1");
dto.setDescribe(describe);
dto.setFileName(fileName);
dto.setFileSize(String.valueOf(fileSize));
dto.setIsUse("0");
dto.setPermit(permit);
dto.setUserID(userDTO.getUserId());

FileInfoDAO fileinfoDAO = (FileInfoDAO) DAOFactory.getDAOFactory(
DBConfig.getDataBaseName()).getFileInfoDAO();
int result = fileinfoDAO.insert(dto);
//request.setAttribute("dat",file.getFileName());
if (result > 0) {
return mapping.findForward("gotoUpload");
}
else {
//设置文件写入数据库时出现的信息
this.setSysMessage(request, "upload.failed", "btn.reupload",
"FileUpload.do?act=gotoUpload");
return mapping.findForward("error");
}
}

public ActionForward fileDownLoad(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws BaseException {
/*
* 取得文件:文件id+文件路径+文件名+流 文件id=通过formbean取得 文件路径=通过取得配置文件的方法得到
* 文件名称=通过数据库得到 流=io
*/
//取得文件路径,也就是保存文件的文件夹名称
String fileID = null;//文件id
String filePath = null;//方法取得路径
String fileName = null;//名称
String permit = null; //权限，用来作身份验证

BufferedInputStream bis = null;
BufferedOutputStream bos = null;
OutputStream fos = null;
InputStream fis = null;

// DynaValidatorForm fileUploadForm = (DynaValidatorForm) form;
// fileID = fileUploadForm.getString("fileID");//得到文件id
fileID = request.getParameter("fileID");
filePath = getUploadDir();
FileInfoDAO fileinfoDAO = (FileInfoDAO) DAOFactory.getDAOFactory(
DBConfig.getDataBaseName()).getFileInfoDAO();

FileInfoDTO fileInfoDTO = fileinfoDAO.findByPK(fileID);
if(fileInfoDTO == null)
{
this.setSysMessage(request, "download.failed", "btn.redownload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}
fileName = fileInfoDTO.getFileName();
permit = fileInfoDTO.getPermit();

//身份验证
UserDTO userDTO = this.getSessionObj(request);
if(userDTO == null)
{
this.setSysMessage(request, "login.failAdmin", "btn.redownload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}
else if(!userDTO.getUserType().equals(fileInfoDTO.getPermit()))
{
this.setSysMessage(request, "login.failAdmin", "btn.redownload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}
if (fileName == null) {
//设置查找数据时出现的错误信息
this.setSysMessage(request, "download.failed", "btn.redownload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}

try {
response.setContentType(this.getContentType(fileName));
response.setHeader("Content-disposition", "attachment;filename="
+ URLEncoder.encode(fileName, "utf-8"));
fis = new FileInputStream(filePath + fileName);
bis = new BufferedInputStream(fis);
fos = response.getOutputStream();
bos = new BufferedOutputStream(fos);

int bytesRead = 0;
byte[] buffer = new byte[5 * 1024];
while ((bytesRead = bis.read(buffer)) != -1) {
bos.write(buffer, 0, bytesRead);//将文件发送到客户端
}
}
catch (IOException e) {
// response.setContentType("text/html");
response.reset();
//设置文件物理下载时出现的错误信息
this.setSysMessage(request, "download.failed", "btn.reupload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}
finally {
try {
if (fos != null) {
fos.close();
}
if (bos != null) {
bos.close();
}
if (fis != null) {
fis.close();
}
if (bis != null) {
bis.close();
}
}
catch (IOException e) {

System.err.print(e);
}
}

return null;
}

public ActionForward showFile(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws BaseException {
/*
* 用户下载的方法， 用户可以看到和下载和自己权限一样的文件和所有游客权限的文件
*/
UserDTO userDTO = getSessionObj(request);
boolean isLogin = true;
boolean isCheck = false;
String userType = null;
if (userDTO == null) {
isLogin = false;
}
else {
if (userDTO.getIsCheck().equals("1")) {
isCheck = true;
}
}
/*
* 获取权限后， 连接数据库， 查找权限为permit,以及4(游客权限)的所有权限， 并生成List对象通过request发送给客户.
*/

//连接数据库
FileInfoDAO fileinfoDAO = (FileInfoDAO) DAOFactory.getDAOFactory(
DBConfig.getDataBaseName()).getFileInfoDAO();

//查找并将数据保存在List对象中.

List list = new ArrayList();
//从FILEINFO表和USERS表中查找需要的数据存放在每一个FileInfoDTO中.

//判断用户的权限：isCheck=ture=审核人员,isLogin=内部用户或者外部用户，客户。其他为游客。
if (isCheck) {
list = fileinfoDAO.findAll();
}
else {
if(isLogin)
{
userType = userDTO.getUserType();
list = fileinfoDAO.findAll(userType, isLogin);
}
else
{
userType = "4";
list = fileinfoDAO.findAll(userType, isLogin);
}
}
//将数据保存在request中
request.setAttribute("fileList", list);
request.setAttribute("userDTO", userDTO);
return mapping.findForward("fileDownload");
}

public ActionForward gotoUpload(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws BaseException {
//用户通过此方法跳转到upload.vm
UserDTO userDTO = getSessionObj(request);
if (userDTO == null) {
//设置用户权限不足时出现的错误,用户将跳转到download.vm--FileUpload.do?act=showFile
this.setSysMessage(request, "login.failAdmin", "btn.redownload",
"FileUpload.do?act=showFile");
return mapping.findForward("error");
}

return mapping.findForward("fileUpload");
}

private boolean isValidFile(String fileName) {
String[] validFiles = { "txt", "gif", "jpg", "jpeg", "jpe", "zip",
"rar", "doc", "ppt", "xls", "html", "htm", "tif", "tiff", "pdf" };
boolean ret = false;
for (int i = 0; i < validFiles.length; i++) {
if (fileName.toLowerCase().endsWith(validFiles[i])) {
ret = true;
break;
}
}
return ret;
}

private String getContentType(String fileName) {
String fileNameTmp = fileName.toLowerCase();
String ret = "";
if (fileNameTmp.endsWith("txt")) {
ret = "text/plain";
}
if (fileNameTmp.endsWith("gif")) {
ret = "image/gif";
}
if (fileNameTmp.endsWith("jpg")) {
ret = "image/jpeg";
}
if (fileNameTmp.endsWith("jpeg")) {
ret = "image/jpeg";
}
if (fileNameTmp.endsWith("jpe")) {
ret = "image/jpeg";
}
if (fileNameTmp.endsWith("zip")) {
ret = "application/zip";
}
if (fileNameTmp.endsWith("rar")) {
ret = "application/rar";
}
if (fileNameTmp.endsWith("doc")) {
ret = "application/msword";
}
if (fileNameTmp.endsWith("ppt")) {
ret = "application/vnd.ms-powerpoint";
}
if (fileNameTmp.endsWith("xls")) {
ret = "application/vnd.ms-excel";
}
if (fileNameTmp.endsWith("html")) {
ret = "text/html";
}
if (fileNameTmp.endsWith("htm")) {
ret = "text/html";
}
if (fileNameTmp.endsWith("tif")) {
ret = "image/tiff";
}
if (fileNameTmp.endsWith("tiff")) {
ret = "image/tiff";
}
if (fileNameTmp.endsWith("pdf")) {
ret = "application/pdf";
}
return ret;
}
}

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