上传：

package com.wb.ekeng.web.action.file;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessages;

import com.wb.ekeng.ebo.BO_File;
import com.wb.ekeng.info.INFO_Admin;
import com.wb.ekeng.info.INFO_File;
import com.wb.ekeng.web.action.BaseAction;
import com.wb.ekeng.web.filemanage.File;
import com.wb.ekeng.web.filemanage.SmartUpload;
import com.wb.ekeng.web.util.Convertor;

public class ACT_AddFile extends BaseAction {

public ACT_AddFile() {
super();
}

public ActionForward doExcute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response, ActionMessages errors) throws Exception {
//文件保存路径
String strSavePath ="/upload/file/";
//允许上传的文件类型
String strAllowExt ="jpg,jpeg,gif,bmp,txt,java";
//允许上传最大字节数
int maxSize =1048576;
//上传文件
SmartUpload upload=new SmartUpload();
upload.initialize(this.getServlet().getServletConfig(), request, response);
upload.upload("UTF-8");
//获取文件
String[] allowExtList =strAllowExt.split(",");
File fileBuffer =upload.getFiles().getFile(0);
if(fileBuffer.isMissing()){
throw new Exception("error.act.act_addfile.error3");
}

HttpSession session=request.getSession();
INFO_Admin loginAdmin=(INFO_Admin) session.getAttribute("loginadmin");
Long lAdminId=loginAdmin.getId();

String strName=upload.getRequest().getParameter("name");
//如果遇见上传中文文件出现乱码问题，上一句可以改成这样（其他语句参照这）： String strName=new String(upload.getRequest().getParameter("name").getBytes(),"UTF-8");
String strNeedPoint=upload.getRequest().getParameter("needpoint");
String strType=upload.getRequest().getParameter("type");
String strDes=upload.getRequest().getParameter("des");

Integer iNeedPoint=null;

//验证参数
if(strName==null||strNeedPoint==null||strType==null||strDes==null){
throw new Exception("error.common.badrequest");
}
this.doValidate(errors,INFO_File.validateName(strName));
this.doValidate(errors,INFO_File.validateNeedPoint(strNeedPoint));
this.doValidate(errors,INFO_File.validateType(strType));
this.doValidate(errors,INFO_File.validateDes(strDes));

//验证文件大小
int FileSize=fileBuffer.getSize();
if(FileSize>maxSize){
this.doValidate(errors,"error.act.act_addfile.error2");
}

//验证文件类型
String strFileExt =fileBuffer.getFileExt();
boolean flag =false;
for(int i=0;i<allowExtList.length;i++) {
if(allowExtList[i].toLowerCase().equals(strFileExt.toLowerCase())){
//找到了匹配的后缀
flag=true;
}
}
if(strFileExt.equals("") || flag ==false){
this.doValidate(errors,"error.act.act_addfile.error1");
}

if(!errors.isEmpty()){
System.out.println(errors.toString());
return null;
}
//参数转换
strName =Convertor.convertHalfToFull(strName);
iNeedPoint=new Integer(strNeedPoint);
Integer iFileSize=Integer.valueOf(FileSize);

//构造saveName
String strSaveName=lAdminId+"_"+BO_File.getNowString()+"."+upload.getFiles().getFile(0).getFileExt();
fileBuffer.saveAs(strSavePath + strSaveName);

//提交数据
BO_File boFile=new BO_File();
boFile.addFile(strName,strType,strDes,strSaveName,iNeedPoint,lAdminId,iFileSize);
return new ActionForward("/admin/main/download/admindownload.do",true);
}
}

下载：
package com.wb.ekeng.web.action.file;

import java.util.ArrayList;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessages;

import com.wb.ekeng.web.action.BaseAction;
import com.wb.ekeng.ebo.BO_File;
import com.wb.ekeng.info.INFO_File;
import com.wb.ekeng.info.INFO_User;

import com.wb.ekeng.web.filemanage.SmartUpload;

/**
* 备注:
* 文件下载Action
* 输入:
* String fileid
* String userid
* 输出:
*/
public class ACT_Download extends BaseAction {

public ACT_Download() {
super();
}
public ActionForward doExcute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response, ActionMessages errors) throws Exception {
HttpSession session =request.getSession();
//获取参数
Long lFileId=null;
String fileId =request.getParameter("fileid");
INFO_User infoUser=(INFO_User)session.getAttribute("loginuser");

//验证参数
if(fileId==null || infoUser.getId() ==null){
throw new Exception("error.common.badrequest");
}
lFileId=new Long(fileId);
BO_File boFile=new BO_File();
INFO_File infoFile =null;

//判断用户是否为第一次下载
接收存储下载资源Id的session，然后判断要下载的资源Id是否没存在于当前登录的下载页表中（即是否是第一次下载），如果是则调用下载扣除积分方法，并把这个资源的Id存入列表中。如果不是，则把标记位置false，直接下载资源，不调用扣除积分的方法。
boolean isFirstDownLoad =true;
ArrayList downFileList =(ArrayList)session.getAttribute("downfilelist");
for(int index =0; index <downFileList.size(); index ++){
Long lFileIdBuffer =(Long)downFileList.get(index);
if(lFileIdBuffer.longValue() ==lFileId.longValue()){
isFirstDownLoad =false;
break;
}
}
if(isFirstDownLoad){
infoFile=boFile.download(lFileId,infoUser.getId());
downFileList.add(lFileId);
}else{
infoFile=boFile.getFile(lFileId);
}
（下面就是有关下载的代码）
//新建一个SmartUpload对象
SmartUpload su = new SmartUpload();
//初始化
su.initialize(this.getServlet().getServletConfig(), request, response);
//设定contentDisposition为null以禁止浏览器自动打开文件，
//保证点击链接后是下载文件。若不设定，则下载的文件扩展名为
//doc时，浏览器将自动用word打开它。扩展名为pdf时，
//浏览器将用acrobat打开。
su.setContentDisposition(null);
//下载文件
su.downloadFile("/upload/file/"+infoFile.getSaveName());
return mapping.findForward("success");
}}