但服务器是linux的，放linux上代码出错，
不能上传，同一个文件上传两次的话，文件能
上传成功，但文件内容变成空值，当文件名为
中文文件名时，出现乱码。
请高手帮忙修改代码，
以下是获得文件上传后的代码。
<%@ page contentType="text/html; charset=UTF-8" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<html>
<head>
<title> upFile </title>
</head>
<body>
<center>
<%
String rootPath;
DataInputStream in = null;
FileOutputStream fileOut = null;
String serverName = request.getServerName();
String realPath = request.getRealPath("/");
rootPath = realPath + "/upload/";
String contentType = request.getContentType();
try{
if(contentType.indexOf("multipart/form-data") >= 0){
in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while(totalBytesRead < formDataLength){
byteRead = in.read(dataBytes,totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
String file = new String(dataBytes,"UTF-8");
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("=");
String boundary = contentType.substring(lastIndex + 1,contentType.length());
String fileName = rootPath + saveFile;
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;
int startPos = ((file.substring(0,pos)).getBytes()).length;
int endPos = ((file.substring(0,boundaryLocation)).getBytes()).length;
File checkFile = new File(fileName);
if(checkFile.exists()){
return;
}
File fileDir = new File(rootPath);
if(!fileDir.exists()){
fileDir.mkdirs();
}
fileOut = new FileOutputStream(fileName);
fileOut.write(dataBytes,startPos,(endPos - startPos));
fileOut.close();
}else{
String content = request.getContentType();
}
}catch(Exception ex){
throw new ServletException(ex.getMessage());
}
%>
</center>
</body>
</html>
