jsp实现文件的上传下载

我只用过smartUpload组件。当然自己写也是可以的 http://www.blueidea.com/tech/program/2008/5258.asp

struts无论哪个版本对上传是封装的，下载部分你要想简单好用可以考虑用我的这个
http://topic.csdn.net/u/20100617/21/a6dccfb2-b793-4f24-a239-9acd65f1e2d7.html

不用那么复杂， struts有个标签好像是 <c:file..> 可以实现上传，楼主可以摆渡下，下载就更容易了只要url+文件名就可以。

这个不是就是跟我那个基本一样的- -
不过struts还是推荐用他自己的上传方案

方案比较的话。就算使用其他方案也不复杂吧。只不过使用struts自带方案在验证方面有优势（进入逻辑类前验证）。
struts1.x与struts2.x标签不一样你给的是2.x的吧不过你居然拿c做标签prefix。
下载只要url+文件名就可以了吗？那是需要http服务或ftp服务支持的好吧，安全性很难控制的。

file是不是只是将文件的路径传到数据库，要怎样实现将整个文件传到服务器

<input type="file" name="fileup">是把客户端文件以流的形式发送给服务器端，服务器端可以拿到这个流，从而获取文件名称，保存到自己本地（服务器端），将保存地址存入数据库。

struts不是自带了上传的组件吗？通过FormFile 很容易啊。去google

我有现成的struts+hibernate的上传代码,你可以留下邮箱,我发给你,但你要自己调试,在我这里运行,在你那里不一定正常运行了

struts1还是struts2?struts2在文件上传方面实现比较简单，楼主可以去电驴上面下载

建议用struts上传下载代码量少很快很方便！

ACTION 代码
package com.upload;import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class upload extends ActionSupport{ /**
*
*/

private static final long serialVersionUID = 1L;
private static final int  BUFFER_SIZE = 16 * 1024  ;

    private File myFile;
    private String fileName;
    private String imageFileName;
    private String caption;

    public void setMyFileContentType(String contentType)  {
   }

    public void setMyFileFileName(String fileName) {
        this .fileName = fileName;
   }

    public void setMyFile(File myFile) {
        this .myFile = myFile;
   }

    public String getImageFileName() {
        return imageFileName;
   }

    public String getCaption() {
        return caption;
   }     public void setCaption(String caption) {
        this .caption = caption;
   }

    private static void copy(File src, File dst) {
        try {
           InputStream in = null ;
           OutputStream out = null ;
            try {
               in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
               out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
                byte [] buffer = new byte [BUFFER_SIZE];
                while (in.read(buffer) > 0 ) {
                   out.write(buffer);
               }
           } finally {
                if ( null != in) {
                   in.close();
               }
                if ( null != out) {
                   out.close();
               }
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

    private static String getExtention(String fileName) {

        int pos = fileName.lastIndexOf(".");

        return fileName.substring(pos);
    }
   @Override
    public String execute()     {
       imageFileName= new Date().getTime() + getExtention(fileName);
       File imageFile=new File(ServletActionContext.getServletContext().getRealPath("/UploadImages") +"/"+imageFileName);
       copy(myFile, imageFile);
        return SUCCESS;
   }

}JSP代码
<%@page language="java" contentType="text/html;charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<html xmlns ="http://www.w3.org/1999/xhtml" >
<head>
    <title> Struts 2 File Upload </title>
</head>
<body>     <s:form action ="/upload.action" method ="POST" enctype ="multipart/form-data"  >
        <s:file name="myFile" label ="Image File" />
        <s:textfield name="caption" label="Caption" />
        <s:submit />
    </s:form >
</body>
</html>

<package name ="fileUploadDemo" namespace="/" extends ="struts-default" >
        <action name="upload" class ="com.upload.upload" >
            <interceptor-ref name ="fileUpload" >
             <param name="allowedTypes">
             image/bmp,image/png,image/jpg
             </param>
            </interceptor-ref>
            <interceptor-ref name="defaultStack" />

            <result name="success">/ShowUpload.jsp</result >
            <result name="input">/Fileupload.jsp</result>
        </action >
    </package >

Strust.xml

JSP文件上传代码实现~          用JSP简单一文件很容易,可是上传的文件里前4行和后5行是表单域信息,中间部分才是客户提交的文件的内容.如何去掉表单域的信息,获取上传的内容?UploadFileExample.jsp<%@ page contentType="text/html; charset=gb2312" language="java"  errorPage="" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>上传文件示例</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
    上传文件程序应用示例
     <form action="AcceptUploadFile.jsp" method="post" enctype="multipart/form-data"><br>
     请选择要上传的文件:<input type="file" name="file" size=50>
                       <input type="submit" value="提交">
     </form>
  </body>
</html>AcceptUploadFile.jsp<%@ page contentType="text/html; charset=gb2312" language="java" import="java.io.*" errorPage="" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>接收上传文件</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
  </head>

  <body>
   <%
    String tempFileName=new String("tempFile1");
    File tempFile1=new File("D:/Java/Tomcat 5.5/webapps/test5/",tempFileName);
    FileOutputStream outputFile=new FileOutputStream(tempFile1);
    InputStream fileSource=request.getInputStream();
    byte b[]=new byte[1000];
    int n;
    while((n=fileSource.read(b))!=-1)
         outputFile.write(b,0,n);
    outputFile.close();
    fileSource.close();


    RandomAccessFile randomFile1=new RandomAccessFile(tempFile1,"r");
    randomFile1.readLine();
    String FilePath=randomFile1.readLine();
    int position=FilePath.lastIndexOf('\\');
    String filename=FilePath.substring(position+1,FilePath.length()-1);
    filename=new String(filename.getBytes("iso-8859-1"),"GBK");

    randomFile1.readLine();
    randomFile1.readLine();
    long forthEnterPosition= randomFile1.getFilePointer();


    File FileUploadDir=new File("D:/Java/Tomcat 5.5/webapps/test5/","Upload");
    FileUploadDir.mkdir();
    File saveFile1=new File("D:/Java/Tomcat 5.5/webapps/test5/Upload/",filename);
    RandomAccessFile randomFile2=new RandomAccessFile(saveFile1,"rw");

    long endPosition=randomFile1.length();
    int j=1;
    while((endPosition>=0)&&(j<=4))
       {
        endPosition--;
        randomFile1.seek(endPosition);
        if(randomFile1.readByte()=='\n')
            j++;
       }
    randomFile1.seek(forthEnterPosition);
    long startPoint=randomFile1.getFilePointer();
    while(startPoint<endPosition-1)
            {
               randomFile2.write(randomFile1.readByte());
               startPoint=randomFile1.getFilePointer();
            }

    randomFile1.close();
    randomFile2.close();
    tempFile1.delete();
    %>

  </body>
</html>参看：http://md20040208.blog.163.com/blog/static/30069427200881493933958/

调试易

jsp实现文件的上传下载

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