上传:
MyjspForm mf = (MyjspForm) form// TODO Auto-generated method stub
FormFile fname=mf.getFname()
byte [] fn = fname.getFileData()
OutputStream out = new FileOutputStream("D:\\"+fname.getFileName())
Date date = new Date()
String title = fname.getFileName()
String url = "d:\\"+fname.getFileName()
Upload ul = new Upload()
ul.setDate(date)
ul.setTitle(title)
ul.setUrl(url)
UploadDAO uld = new UploadDAO()
uld.save(ul)
out.write(fn)
out.close()
下载:
DownloadForm downloadForm = (DownloadForm)form
String fname = request.getParameter("furl")
FileInputStream fi = new FileInputStream(fname)
byte[] bt = new byte[fi.available()]
fi.read(bt)
//设置文件是下载还是打开以及打开的方式msdownload表示下载;设置字湖集,//主要是解决文件中的中文信息
response.setContentType("application/msdownloadcharset=gbk")
//文件下载后的默认保存名及打开方式
String contentDisposition = "attachmentfilename=" + "java.txt"
response.setHeader("Content-Disposition",contentDisposition)
//设置下载长度
response.setContentLength(bt.length)
ServletOutputStream sos = response.getOutputStream()
sos.write(bt)
return null
用JSP实现文件上传功能,参考如下:UploadExample.jsp
<%@ page contentType="text/htmlcharset=gb2312"%>
<html>
<title><%= application.getServerInfo() %></title>
<body>
上传文件程序应用示例
<form action="doUpload.jsp" method="post" enctype="multipart/form-data">
<%-- 类型enctype用multipart/form-data,这样可以把文件中的数据作为流式数据上传,不管是什么文件类型,均可上传。--%>
请选择要上传的文件<input type="file" name="upfile" size="50">
<input type="submit" value="提交">
</form>
</body>
</html>
doUpload.jsp
<%@ page contentType="text/htmlcharset=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">
<%
//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()
//获得服务器的名字
String serverName = request.getServerName()
//取得互联网程序的绝对地址
String realPath = request.getRealPath(serverName)
realPath = realPath.substring(0,realPath.lastIndexOf("\\"))
//创建文件的保存目录
rootPath = realPath + "\\upload\\"
//取得客户端上传的数据类型
String contentType = request.getContentType()
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("<P>上传的文件字节数不可以超过" + MAX_SIZE + "</p>")
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("<p>" + saveFile + "文件已经存在.</p>")
}
//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.</p>")
}else{
String content = request.getContentType()
out.println("<p>上传的数据类型不是multipart/form-data</p>")
}
}catch(Exception ex){
throw new ServletException(ex.getMessage())
}
%>
</body>
</html>
运行方法,将这两个JSP文件放在同一路径下,运行UploadExample.jsp即可。
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