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java三種方式實現檔案的上傳

1:

實現檔案的上傳可以有好多途徑,最簡單的就是用sun公司提供的File類,可以簡單的實現檔案的上傳和顯示:

          try {

            InputStream stream = file.getInputStream();//把檔案讀入

            Savefilepath = request.getRealPath("/upload");//將檔案存放在當前系統路徑的哪個資料夾下                                   

            Savefilename = getNewFilename(file.getFileName());

            Savefilepath = Savefilepath + "\\" + Savefilename;

            OutputStream bos = new FileOutputStream(Savefilepath);//建立一個上傳檔案的輸出流                    

            int bytesRead = 0;

            byte[] buffer = new byte[10*1024];

            while ( (bytesRead = stream.read(buffer, 0, 10240)) != -1) {

              bos.write(buffer, 0, bytesRead);//將檔案寫入伺服器的硬碟上

           }

            bos.close();

            stream.close();

         }catch(Exception e){

           e.printStackTrace();

         }

2:

簡單的程式碼如下,於此同時有一個很簡單的擴充套件的jspsmart很好用,他是封裝好的一些上傳的組建,做一些上傳的優化,下面就是簡單實現上傳的例子:

上傳頁面:
<html>
 <head>
       <title>smartupload</title>
 </head>
 <body>
       <form action="smartupload02.jsp" method="post" enctype="multipart/form-data">
             上傳的圖片:<input type="file" name="pic">
             <input type="submit" value="上傳">
       </form>
 </body>
</html>

處理頁面:

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

<jsp:useBean id="smartupload" class="org.lxh.smart.SmartUpload"/>

<html>

    <head>

       <title>smartupload</title>

    </head>

    <body>

    <%

       smartupload.initialize(pageContext) ;  // 初始化上傳

       smartupload.upload() ;                 // 準備上傳

       smartupload.save("upload") ;           // 儲存檔案

    %>

    </body>

</html>

3:

最後就是servlet3.0的新特性裡面的上傳檔案的新特性,他則是採用part來實現的,下面是簡單的例子:

package com.simple;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.Part;

import com.sun.xml.ws.wsdl.parser.Part;

public class uploadServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

       request.setCharacterEncoding("utf-8");

       Part part = request.getPath("file");

       String name = part.getName();

       String url = request.getSession().getServletContext().getRealPath("/upload");

       String reqName = request.getHeader("content-disposition");

       String fileName = reqName.substring(reqName.lastIndexOf("=")+2, reqName.length()-1);

       part.write(url+"/"+fileName);

    }

}

其實功能是一樣的,要求也就是以實現功能為宗旨,但是多學習點東西總是好的。