怎么样把上传流存到数据中再从数据库中取出来帮帮忙谢谢

QQ644486560 2010-11-27 09:30:30

upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%@ page contentType="text/html;charset=gb2312"%>
<html><title><%= application.getServerInfo() %></title>
<body>
上传文件
<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>

...全文

63 2 打赏收藏转发到动态举报

写回复

用AI写文章

2 条回复

切换为时间正序

请发表友善的回复…

发表回复

QQ644486560 2010-11-27

打赏
举报

怎样把上传流存到数据库再从数据库中取出来？帮帮忙写下完整的代码谢谢

QQ644486560 2010-11-27

打赏
举报

doUpload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>

<%@ 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">
<%
//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>");
request.getSession().setAttribute("fileName",saveFile);
} 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>