實作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，可以簡單的實作檔案的上傳和顯示：
try {
InputStream stream = file.getInputStream();//把檔案讀入
Savefilepath = request.getRealPath("/upload");//将檔案存放在目前系統路徑的哪個檔案夾下
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);//将檔案寫入伺服器的硬碟上
}
bos.close();
stream.close();
}catch(Exception e){
e.printStackTrace();
}
2：
簡單的代碼如下，于此同時有一個很簡單的擴充的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，下面就是簡單實作上傳的例子：
上傳頁面：
<html>
<head>
<title>smartupload</title>
</head>
<body>
<form action="smartupload02.jsp" method="post" enctype="multipart/form-data">
上傳的圖檔：<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，他則是采用part來實作的，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);
}
}
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