教您纯Jsp的自定义的单个文件上载代码

2009-12-21 21:51| 发布者: admin| 查看: 49| 评论: 0|原作者: 千年缘

　　本文是一个纯Jsp的自定义的单个文件上载代码:
<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>

<br>upFile <br>

<%
//定义上载文件的最大字节
int MAX_SIZE = 102400 * 102400;
// 创建根路径的保存变量
String rootPath;

//声明文件读入类
DataInputStream in = null;
FileOutputStream fileOut = null;
//取得客户端的网络地址
String remoteAddr = request.getRemoteAddr();
//out.print(remoteAddr);
//获得服务器的名字
String serverName = request.getServerName();
//out.print(serverName);
//取得jsp文件相对与根地址的地址
//out.print(request.getServletPath());
//取得互联网程序的绝对地址
String realPath = request.getRealPath(serverName);
//out.println(realPath);
realPath = realPath.substring
(0,realPath.lastIndexOf("\\"));
//out.print(realPath);
//创建文件的保存目录"\upload"
rootPath = realPath + "\\upload\\";
//out.println(rootPath);
//取得客户端上传的数据类型
String contentType = request.getContentType();
//out.println
("

客户端上传的数据类型 =
" + contentType + "

");
try{
if(contentType.indexOf
("multipart/form-data") >= 0)
{
//读入上传的数据
in = new DataInputStream
(request.getInputStream());
int formDataLength =
request.getContentLength();
if(formDataLength > MAX_SIZE){
out.println
("

上传的文件字节数不可以超过"
+ MAX_SIZE + "

");
return;
}
//保存上传文件的数据
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
//上传的数据保存在byte数组
while(totalBytesRead < formDataLength)
{
byteRead = in.read(dataBytes,
totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
//根据byte数组创建字符串
String file = new String(dataBytes);
//out.println(file);
//取得上传的数据的文件名
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("=");
//取得数据的分隔字符串
String boundary =
contentType.substring
(lastIndex + 1,contentType.length());
//创建保存路径的文件名
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);
//取得文件数据的开始的位置
int startPos = (
(file.substring(0,pos)).getBytes()).length;
//out.println(startPos);
//取得文件数据的结束的位置
int endPos = ((file.substring
(0,boundaryLocation)).getBytes()).length;
//out.println(endPos);
//检查上载文件是否存在
File checkFile = new File(fileName);
if(checkFile.exists()){
out.println("

" + saveFile +
"文件已经存在.

");
}
//检查上载文件的目录是否存在
File fileDir = new File(rootPath);
if(!fileDir.exists())
{
fileDir.mkdirs();
}
//创建文件的写出类
fileOut = new FileOutputStream(fileName);
//保存文件的数据
fileOut.write(dataBytes,startPos,
(endPos - startPos));
fileOut.close();
out.println("

" + saveFile +
"文件成功上载.

");
}else{
String content = request.getContentType();
out.println
("

上传的数据类型不是是multipart/form-data

");
}
}catch(Exception ex)
{
throw new ServletException(ex.getMessage());
}
%>

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