----上传下载的方法类

package com.strongit.tool.upload;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import jcifs.smb.SmbFile;

import jcifs.smb.SmbFileInputStream;

import jcifs.smb.SmbFileOutputStream;

public class SMB {

	/**

     * 从本地上传文件到共享目录

     * @param remoteUrl 共享文件目录

     * @param localFilePath 本地文件绝对路径

     */  

	 public static void smbPut(String remoteUrl, String localFilePath)

	    {

	        InputStream in = null;

	        OutputStream out = null;

	        try

	        {

	            File localFile = new File(localFilePath);  

	            String fileName = localFile.getName();

	            SmbFile remoteFile = new SmbFile(remoteUrl+"/"+ fileName);

	            in = new BufferedInputStream(new FileInputStream(localFile));

	            out = new BufferedOutputStream(new SmbFileOutputStream(remoteFile));

	            byte[] buffer = new byte[1024];

	            while (in.read(buffer) != -1)

	            {

	                out.write(buffer);

	                buffer = new byte[1024];

	            }

	        }

	        catch (Exception e)

	        {

	            e.printStackTrace();

	        }

	        finally

	        {

	            try

	            {

	                out.close();

	                in.close();

	            }

	            catch (IOException e)

	            {

	                e.printStackTrace();

	            }

	        }

	    }  

	 	/**

	     * 从共享目录拷贝文件到本地

	     * @param remoteUrl 共享目录上的文件路径

	     * @param localDir 本地目录

	     */

	    public static void smbGet(String remoteUrl, String localFileStr)

	    {

	        InputStream in = null;

	        OutputStream out = null;

	        try

	        {

	            SmbFile remoteFile = new SmbFile(remoteUrl);

	            remoteFile.connect();

	            if (remoteFile == null)

	            {

//	                System.out.println("共享文件不存在");

	                return;

	            }

	            String fileName = remoteFile.getName();

	            localFileStr = localFileStr + fileName;

	            File localFile = new File(localFileStr); 

	            if(!localFile.exists())

	            {

	            	localFile.createNewFile();

	            }

	            in = new BufferedInputStream(new SmbFileInputStream(remoteFile));  

	            out = new BufferedOutputStream(new FileOutputStream(localFile));

	            byte[] buffer = new byte[1024];

	            while (in.read(buffer) != -1)

	            {

	                out.write(buffer);

	                buffer = new byte[1024];

	            }

	        }

	        catch (Exception e)

	        {

	            e.printStackTrace();

	        }

	        finally

	        {

	            try

	            {

	                out.close();

	                in.close();

	            }

	            catch (IOException e)

	            {

	                e.printStackTrace();

	            }

	        }

	    }  

}

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.UnsupportedEncodingException;

import java.util.Iterator;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

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;

/*

 * smb协议

 * 上传文件到另一台局域网服务器

 * */

public class formservlet extends HttpServlet {

	//要将文件存储到远程服务器的存储地址

	//	smb://用户名：密码@地址/共享的目录

	private static final String remoteUrl ="smb://administrator:shichengzhe@192.168.2.112/gongxiang";

	public String getStr(String str)

	{

		String s=null ;

		if(str!=null)

		{

			try {

				s = new String(str.getBytes("ISO8859-1"),"gb2312");

			} catch (UnsupportedEncodingException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

			System.out.println("转码出现错误");

			}

		}

		return s;

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		request.setCharacterEncoding("gb2312");

		response.setContentType("text/html;charset=gb2312");

		//设置合法的后缀名-可以添加需要上传的文件类型

		final String[] allowedatt = new String[] {"doc","docx","html","htm","txt","mp4"};

		//创建该对象

	    DiskFileItemFactory factory = new DiskFileItemFactory();

	    //上传文件所用到的缓冲区大小,超过此缓冲区的部分将被写入到磁盘

	    factory.setSizeThreshold(4*1024);

	    //使用fileItemFactory为参数实例化一个ServletFileUpload对象

	    ServletFileUpload upload = new ServletFileUpload(factory);

	     //要求上传的form-data数据不超过1000M

	    upload.setSizeMax(1000*1024*1024);

	    //java.util.List实例来接收上传的表单数据和文件数据

	    List itemList;

		try {

			itemList = upload.parseRequest(request);

			//迭代list中的内容

		    Iterator it = itemList.iterator();

		    //循环list中的内容

		    while(it.hasNext())

		    {

		    	 //取出一个表单域

		    	 FileItem item =(FileItem) it.next();

		    	 //如果不是普通表单，则代表是文件上传的表单

		    	 //获取上传文件的名字

		    	 String totalNameatt = getStr(item.getName());

		    	 //获取文件的后缀名

		    	 String suffixatt =  totalNameatt.substring(totalNameatt.lastIndexOf(".") + 1);

		    	 //判断后缀名是否是我们允许上传的类型

		    	 boolean isValide=false;

		    	 for(int i=0;i<allowedatt.length;i++)

		    	 {

			        if(suffixatt.equals(allowedatt[i])){

			        	isValide=true;

			        	break;

			        		}

			      }

		    	 //如果是不允许的类型，输出错误信息

		    	 if(!isValide)

		    	 {

		    		System.out.println(totalNameatt+"该文件类型不在允许上传的范围内");

		    		return ;

		    	 }

		    	 //如果是合法的，就保存该文件，文件名不变

		    	else

		    	{

		    		//获取项目根目录

		    		String rootPath = this.getServletConfig().getServletContext().getRealPath("/");

		    		//要存储的文件的绝对路径

		    		String filestr = rootPath +System.currentTimeMillis()+"."+suffixatt;

		    		File file = new File(filestr);
                                //获取选择上传文件的 存放到项目里面

		    		item.write(file);
                                //上传到服务器

		    		saveRemote(filestr);
                                //删除存放在目录里的上传文件

		    		file.delete();

		    	}

		    }

		} catch (FileUploadException e) {

			e.printStackTrace();

		} catch (Exception e) {

			e.printStackTrace();

		}

	}

	/*

	 * localFilePath 本地文件地址

	 * */

	public void saveRemote(String localFilePath)

	{

		SMB.smbPut(remoteUrl, localFilePath);

	}

}

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ReadServlet extends HttpServlet {

	private static final String remoteUrl ="smb://administrator:shichengzhe@192.168.2.112/gongxiang";

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doPost(request,response);

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		//获取要获得的文件名

		String filename = request.getParameter("filename");

		//拼凑要下载文件的绝对路径

		String fileUrl = remoteUrl + "/" + filename;

		//拼凑本地路径

		String root =this.getServletConfig().getServletContext().getRealPath("/");

		String localUrl = root+System.getProperty("file.separator")+filename;

		SMB.smbGet(fileUrl, localUrl);

		System.out.println("文件:"+localUrl+"下载成功");

	}

}

<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%>

<%

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>My JSP 'index.jsp' starting page</title>

    <meta http-equiv="Content-Type" content="text/html; charset=GB2312" />

  </head>

  <body>

    <form action="servlet/formservlet" method="post" enctype="multipart/form-data" >

        <input type="file" id="file" name="file" /><br/>

        <input type="submit" value="提交" />

    </form>

              <!-- action? 要从服务器下载的文件 -->

    <a href="servlet/ReadServlet?filename=234234.doc">从远程服务器读取文件</a>

  </body>

</html>

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>formservlet</servlet-name>

    <servlet-class>formservlet</servlet-class>

  </servlet>

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>ReadServlet</servlet-name>

    <servlet-class>ReadServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>formservlet</servlet-name>

    <url-pattern>/servlet/formservlet</url-pattern>

  </servlet-mapping>

  <servlet-mapping>

    <servlet-name>ReadServlet</servlet-name>

    <url-pattern>/servlet/ReadServlet</url-pattern>

  </servlet-mapping>

</web-app>