教您純Jsp的自訂的單個檔案上傳代碼

最後更新：2017-02-28 來源：互聯網

上載者：User

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　　本文是一個純Jsp的自訂的單個檔案上傳代碼:

<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<html>
<head>
<title>
upFile
</title>
</head>
<body bgcolor="#ffffff">
<center>
<%
//定義上傳檔案的最大位元組
int MAX_SIZE = 102400 * 102400;
// 建立根路徑的儲存變數
String rootPath;

//聲明檔案讀入類
DataInputStream in = null;
FileOutputStream fileOut = null;
//取得用戶端的網路地址
String remoteAddr = request.getRemoteAddr();
//out.print(remoteAddr);
//獲得伺服器的名字
String serverName = request.getServerName();
//out.print(serverName);
//取得jsp檔案相對與根地址的地址
//out.print(request.getServletPath());
//取得互連網程式的絕對位址
String realPath = request.getRealPath(serverName);
//out.println(realPath);
realPath = realPath.substring
(0,realPath.lastIndexOf("\\"));
//out.print(realPath);
//建立檔案的儲存目錄"\upload"
rootPath = realPath + "\\upload\\";
//out.println(rootPath);
//取得用戶端上傳的資料類型
String contentType = request.getContentType();
//out.println
("用戶端上傳的資料類型 =
" + contentType + "");
try{
if(contentType.indexOf
("multipart/form-data") >= 0)
{
//讀入上傳的資料
in = new DataInputStream
(request.getInputStream());
int formDataLength =
request.getContentLength();
if(formDataLength > MAX_SIZE){
out.println
("上傳的檔案位元組數不可以超過"
+ MAX_SIZE + "");
return;
}
//儲存上傳檔案的資料
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
//上傳的資料儲存在byte數組
while(totalBytesRead < formDataLength)
{
byteRead = in.read(dataBytes,
totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
//根據byte數組建立字串
String file = new String(dataBytes);
//out.println(file);
//取得上傳的資料的檔案名稱
String saveFile = file.substring
(file.indexOf("filename=\"") + 10);
saveFile = saveFile.substring
(0,saveFile.indexOf("\n"));
saveFile = saveFile.substring
(saveFile.lastIndexOf("\\")
+ 1,saveFile.indexOf("\""));
int lastIndex =
contentType.lastIndexOf("=");
//取得資料的分隔字串
String boundary =
contentType.substring
(lastIndex + 1,contentType.length());
//建立儲存路徑的檔案名稱
String fileName = rootPath + saveFile;
//out.print(fileName);
int pos;
pos = file.indexOf("filename=\"");
pos = file.indexOf("\n",pos) + 1;
pos = file.indexOf("\n",pos) + 1;
pos = file.indexOf("\n",pos) + 1;
int boundaryLocation =
file.indexOf(boundary,pos) - 4;
//out.println(boundaryLocation);
//取得檔案資料的開始的位置
int startPos = (
(file.substring(0,pos)).getBytes()).length;
//out.println(startPos);
//取得檔案資料的結束的位置
int endPos = ((file.substring
(0,boundaryLocation)).getBytes()).length;
//out.println(endPos);
//檢查上傳檔案是否存在
File checkFile = new File(fileName);
if(checkFile.exists()){
out.println("" + saveFile +
"檔案已經存在.");
}
//檢查上傳檔案的目錄是否存在
File fileDir = new File(rootPath);
if(!fileDir.exists())
{
fileDir.mkdirs();
}
//建立檔案的寫出類
fileOut = new FileOutputStream(fileName);
//儲存檔案的資料
fileOut.write(dataBytes,startPos,
(endPos - startPos));
fileOut.close();
out.println("" + saveFile +
"檔案成功上傳.");
}else{
String content = request.getContentType();
out.println
("上傳的資料類型不是是multipart/form-data");
}
}catch(Exception ex)
{
throw new ServletException(ex.getMessage());
}
%>
</center>
</body>
</html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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