jsp 上传与下载

这种问题建议你先去 Google ，baidu，搞不懂的再来这里。

http://www.pudn.com/downloads158/sourcecode/java/jsp/detail708336.html
自己去下个看看吧！
这里是专业的地方哈哈！不适合贴代码！嘎嘎！

jsp上传和下载和 java io 有关
先弄懂这个就很快了

纯jsp上传
package com.accp.uploaddemo.web.servlet;import javax.servlet.http.HttpServlet;
import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.*;
import java.util.*;
import java.util.regex.*;
import java.io.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory; public class  UploadServlet extends HttpServlet {
//BLOB @Override
public void init(ServletConfig config) throws ServletException {
  this.config = config;
} private ServletConfig config = null;

private File tempPath = new File("D:\\data\\temp\\"); // 用于存放临时文件的目录 public void destroy() {
  config = null;
  super.destroy();
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
   throws ServletException, IOException {
  int id = -1;

  String uploadPath = config.getInitParameter("uploadPath"); // 用于存放上传文件的目录

  res.setContentType("text/html; charset=GB2312");
  PrintWriter out = res.getWriter();
  System.out.println(req.getContentLength());
  System.out.println(req.getContentType());
  DiskFileItemFactory factory = new DiskFileItemFactory();
  // maximum size that will be stored in memory
  factory.setSizeThreshold(4096);
  // the location for saving data that is larger than getSizeThreshold()
  factory.setRepository(tempPath);   ServletFileUpload upload = new ServletFileUpload(factory);
  // maximum size before a FileUploadException will be thrown
  upload.setSizeMax(90000000);//设置可上传文件最大值
  try {
   List fileItems = upload.parseRequest(req);
   // 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", ".jsp" };
   Pattern p = Pattern.compile(regExp);
   while (iter.hasNext()) {
    FileItem item = (FileItem) iter.next();
    if(item.isFormField()) {
     if(item.getFieldName().equals("id")) {
      id = Integer.parseInt(item.getString());
     }
    }
    // 忽略其他不是文件域的所有表单信息
    if (!item.isFormField()) {
     String name = item.getName();
     long size = item.getSize();
     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 type");
       }
      }
      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
       String fileName=name.substring(name.lastIndexOf("\\")+1);
       item.write(new File(uploadPath +fileName));//保存上传文件(虽要什么类型也在这里规定)        out.print(name + "  " + size + "<br>");
      } catch (Exception e) {
       out.println(e);
      }      } else {
      throw new IOException("fail to upload");
     }
    }
   }
  } catch (IOException e) {
   out.println(e);
  } catch (FileUploadException e) {
   out.println(e);
  } } }
纯jsp下载
package com.accp.uploaddemo.web.servlet;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class DownloadServlet extends HttpServlet {
ServletConfig config=null;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//被下载的文件目录
String downloadFilePath=config.getInitParameter("downloadFilePath");
//关联输出流
OutputStream o=response.getOutputStream();
//需被下载的文件名
String downloadFileName="sshDemo-y2t120.rar";
//读入文件缓冲
byte b[]=new byte[1024];
File fileload=new File(downloadFilePath,downloadFileName);
//弹出下载对话框
response.setHeader("Content-disposition", "attachment:filename="+downloadFileName);
//关联下载格式
String ext=downloadFileName.substring(downloadFileName.lastIndexOf(".")+1);
if(ext.equalsIgnoreCase("doc")||ext.equalsIgnoreCase("doc")){
response.setContentType("application/msword");
}
else if(ext.equalsIgnoreCase("jpg")||ext.equalsIgnoreCase("jpeg")||ext.equalsIgnoreCase("jpe")){
response.setContentType("image/jpeg");
}
else if(ext.equalsIgnoreCase("xls")){
response.setContentType("application/vnd.ms-excel");
}
else if(ext.equalsIgnoreCase("rar")||ext.equalsIgnoreCase("zip")){
response.setContentType("application/x-tar");
}
else{
response.setContentType("application/msword");
}
long fileLength=fileload.length();
String length=String.valueOf(fileLength);
//设置下载文件大小
response.setHeader("Content-length",length);
FileInputStream in=new FileInputStream(fileload);
int n=0;
while((n=in.read(b))!=-1){
o.write(b,0,n);
}
} @Override
protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(arg0,arg1);
} @Override
public void init(ServletConfig arg0) throws ServletException {
// TODO Auto-generated method stub
this.config=arg0;
}

}

用struts1x做上传
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.accp.uploaddemo.web.struts.action;import java.io.File;import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;import com.accp.uploaddemo.web.struts.form.UploadForm;/**
* MyEclipse Struts
* Creation date: 08-20-2006
*
* XDoclet definition:
* @struts.action path="/upload" name="uploadForm" input="/form/upload.jsp" scope="request"
*/
public class UploadAction extends Action {
/*
* Generated Methods
*/ /**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
* @throws IOException
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws IOException {

            response.setContentType("text/html; charset=GB2312");
            //获取提交表单
            UploadForm theForm = (UploadForm) form;
            // 获取提交的文件
            FormFile file = theForm.getThefile();            // 获取提交文件名
            String fileName= file.getFileName();            //获取上传的文件类型
            String contentType = file.getContentType();                    //获取上传文件大小
            String size = (file.getFileSize() + " bytes");            //指定文件上传目录
             File tempPath = new File("D:\\data\\temp\\",fileName);
            try {
                //retrieve the file data
               //引入上传文件流
                InputStream stream = file.getInputStream();

                    //输出并指定文件
                    OutputStream bos = new FileOutputStream(tempPath);
                    //读入的实际字节数
                    int bytesRead = 0;
                    //设置读入缓冲
                    byte[] buffer = new byte[8192];
                    //开始读入
                    while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {
                     //写入文件
                        bos.write(buffer, 0, bytesRead);
                    }
                    //关闭输出流
                    bos.close();


                //关闭输入流
                stream.close();
            }
            catch (FileNotFoundException fnfe) {
                return null;
            }
            catch (IOException ioe) {
                return null;
            }            //关闭sturts的FormFile临时文件
            file.destroy();            //return a forward to display.jsp
            return mapping.findForward("success");

}

}
------------------------
struts1x的上传actionform
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.accp.uploaddemo.web.struts.form;import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;/**
* MyEclipse Struts
* Creation date: 08-20-2006
*
* XDoclet definition:
* @struts.form name="uploadForm"
*/
public class UploadForm extends ActionForm {
/*
* Generated Methods
*/ /**
* Method validate
* @param mapping
* @param request
* @return ActionErrors
*/
public ActionErrors validate(ActionMapping mapping,
HttpServletRequest request) {
// TODO Auto-generated method stub
return null;
} /**
* Method reset
* @param mapping
* @param request
*/
public void reset(ActionMapping mapping, HttpServletRequest request) {
// TODO Auto-generated method stub
}
protected FormFile thefile;
public FormFile getThefile() {
return thefile;
}--------------------------
struts1x下载
package com.accp.uploaddemo.web.struts.action;import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;public class DownLoadAction extends Action {
@Override
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
// 被下载的文件目录
String downloadFilePath="D:\\data\\temp";
//关联输出流
OutputStream o=response.getOutputStream();
//需被下载的文件名
String downloadFileName="2007102783853632.jpg";
//读入文件缓冲
byte b[]=new byte[1024];
File fileload=new File(downloadFilePath,downloadFileName);
//弹出下载对话框
response.setHeader("Content-disposition", "attachment:filename="+downloadFileName);
//关联下载格式
String ext=downloadFileName.substring(downloadFileName.lastIndexOf(".")+1);
if(ext.equalsIgnoreCase("doc")||ext.equalsIgnoreCase("doc")){
response.setContentType("application/msword");
}
else if(ext.equalsIgnoreCase("jpg")||ext.equalsIgnoreCase("jpeg")||ext.equalsIgnoreCase("jpe")){
response.setContentType("image/jpeg");
}
else if(ext.equalsIgnoreCase("xls")){
response.setContentType("application/vnd.ms-excel");
}
else if(ext.equalsIgnoreCase("rar")||ext.equalsIgnoreCase("zip")){
response.setContentType("application/x-tar");
}
else{
response.setContentType("application/msword");
}
long fileLength=fileload.length();
String length=String.valueOf(fileLength);
//输出设置下载文件大小
response.setHeader("Content-length",length);
FileInputStream in=new FileInputStream(fileload);
int n=0;
while((n=in.read(b))!=-1){
o.write(b,0,n);
}
return null;
}
}

jspsmart是不是要从网上下载？安装？我已安装tomcat \ sqlserver2000 \myeclipse

这种问题建议你先去 Google ，baidu，搞不懂的再来这里。

很简单嘛。楼上都给出了正解了。code也有。

jspsmart是不是要从网上下载？安装？我已安装tomcat \ sqlserver2000 \myeclipse

给你个链接：http://blog.csdn.net/cloudgamer
这里有你需要的内容，包括相应的实例，下载下来，在相关的硬盘建立文件夹即可。
估计你会感兴趣的。
看帖必回帖。
注：楼上的代码为测试，无法知道。

调试易

jsp 上传与下载

解决方案 »