struts 1.2 文件上传与下载

/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.action;

import com.form.FileForm;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.actions.DispatchAction;
import java.util.Date;
import java.util.Calendar;
import java.util.Vector;
import org.apache.struts.upload.*;
import tools.ListPage;
import java.io.*;
import java.net.URLEncoder;

/**
* MyEclipse Struts
* Creation date: 03-29-2008
*
* XDoclet definition:
* @struts.action path="/fileAction" name="fileForm" parameter="method" scope="request"
*/
public class FileAction extends DispatchAction {
/*
* Generated Methods
*/

/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/

//文件上传
public ActionForward upload(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response) {
   final String fileExt="gif,GIF,jpg,JPG,jpeg,JPEG";
   final int maxSize=409600;
   FileForm fileForm = (FileForm) form;// TODO Auto-generated method stub
   ActionMessages messages=new ActionMessages();
   boolean flag=true;
   if(fileForm.getName().equals(""))
   {
    flag=false;
    messages.add("nameerror",new ActionMessage("name.error"));
   }
   if(fileForm.getUser().equals(""))
   {
    flag=false;
    messages.add("usererror",new ActionMessage("user.error"));
   }
   if(fileForm.getFile().getFileSize()==0)
   {
    flag=false;
    messages.add("fileerror",new ActionMessage("file.error"));
   }
   else
   {
    FormFile f=fileForm.getFile();
    int fileSize=f.getFileSize();
    int i=f.getFileName().indexOf(".");
    String ext=f.getFileName().substring(i+1);
    if(fileExt.indexOf(ext)==-1)
    {
     flag=false;
     messages.add("fileexterror",new ActionMessage("file.ext.error"));
    }
    if(fileSize>maxSize)
    {
     flag=false;
     messages.add("filesizeerror",new ActionMessage("file.size.error"));
    }
   }
   HttpSession session=request.getSession();
   if(request.getParameter("validate").equals(""))
   {
    flag=false;
    messages.add("validatenull",new ActionMessage("validate.null.error"));
   }
   else if(!request.getParameter("validate").equals((String)session.getAttribute("valicode")))
   {
    flag=false;
    messages.add("validateerror",new ActionMessage("validate.error"));
   }
   if(!flag)
   {
    saveErrors(request,messages);
    return mapping.findForward("error");
   }
   FormFile file=fileForm.getFile();
   String dir=servlet.getServletContext().getRealPath("/");
   int size=file.getFileSize();
   //System.out.println(size);
   String fileName=uploadFile(dir,file);
   String path="/"+fileName;
        fileForm.setPath(path);
        fileForm.setSize(file.getFileSize());
        fileForm.setTime(new Date().toLocaleString());
        ListPage listPage=new ListPage();
        listPage.insert(fileForm);
        /*
         * 若insert方法返回值为flase说明插入数据库失败;
         * 调用deleteImage(path)方法删除上传好的图片;
         * messages.add("filefailed",new ActionMessage("file.failed"));
         * return mapping.findForward("error");
         */
   messages.add("filesuccess",new ActionMessage("file.success"));
   saveMessages(request,messages);
   return mapping.findForward("success");
}

//文件下载
public ActionForward download(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response)
{
   String path=request.getParameter("path");
   BufferedInputStream bis=null;
   BufferedOutputStream bos=null;
   OutputStream os=null;
   InputStream is=null;
   String filePath=servlet.getServletContext().getRealPath("/"+path);
        try
        {
     
       File downloadFile=new File(filePath);
       is=new FileInputStream(downloadFile);
       bis=new BufferedInputStream(is);
       os=response.getOutputStream();
       bos=new BufferedOutputStream(os);
       response.setHeader("Content-disposition", "attachment;filename="+URLEncoder.encode(path,"utf-8"));
       int bytesRead=0;
       byte[] buffer=new byte[8192];
       while((bytesRead=bis.read(buffer,0,8192))!=-1)
       {
        bos.write(buffer, 0, bytesRead);
       }
       bos.flush();                      
       is.close();
       bis.close();
       os.close();
       bos.close();
        }
        catch(Exception e){
        e.printStackTrace();
        }
   return null;
}

public String uploadFile(String dir,FormFile file)
{
   String fname=file.getFileName();
   int i=fname.indexOf(".");
   String type=fname.substring(i+1);
        Calendar calendar = Calendar.getInstance();
        String fileName="files/"+calendar.get(Calendar.YEAR) + (calendar.get(Calendar.MONTH)+1) + calendar.get(Calendar.DAY_OF_MONTH) +calendar.get(Calendar.HOUR_OF_DAY)+calendar.get(Calendar.MINUTE)+calendar.get(Calendar.SECOND)+calendar.get(Calendar.MILLISECOND)+Math.round(Math.random()*100*1000)+"."+type;
        //System.out.println(fileName);
        try
        {
            InputStream in=file.getInputStream();
            String path=dir+fileName;
            OutputStream out=new FileOutputStream(path);
            int bytesRead=0;
            byte[] buffer=new byte[8192];
            while((bytesRead=in.read(buffer, 0, 8192))!=-1)
            {
            out.write(buffer, 0, bytesRead);
            }
            out.close();
            in.close();
        }
        catch(Exception e)
        {
        e.printStackTrace();
        }
        file.destroy();
        return fileName;
}

}