用java实现ORACLE数据库的文件上传、下载

文件上传使用：http://www.Javazoom.net 的 UploadBean JAVA包，他的文件上传做的还不错，可进行目录或数据库的文件上传，默认使用的是Oracle 的LONGRAW子段类型，可使用BLOB类型，但需要使用扩展JAVA包，LONGRAW子段最大长度为2GB，并且一个表内只答应出现一个LONGRAW型子段，不过已经够我用了，而BLOB型子段最大为4GB，而且没有表中出现次数的限制。备注：想用他下载的组件Download4J 1.0，我劝还是别做梦了，在功能上不太适合用在数据库下载。

文件下载使用的是：http://www.jspsmart.com的SmartUpload JAVA包，该包即可以文件上传，也可以文件下在，而且使用也比较方便，不过我在这里只使用文件从数据库下载功能，有爱好的朋友可以试试。

下面我把使用这两个包的源CODE给大家说一下，以后大家碰道这些问题就不用象我一样发愁了，哎！多伟大的人呀！大家给点掌声安慰我这个受伤的孤独男人吧！

文件上传：
实际上这些ＪＡＶＡ包都有使用的例子，不过我还是要贴出来。　
文件名：ChineseDatabaseUpload.jsp
文件内容：
<Html>
<%@ page language="java" contentType="text/html; charset=gb2312" import="javazoom.upload.*,java.util.*" %>
<%@ page errorPage="ExceptionHandler.jsp" %>
<jsp:useBean id="upBean" scope="application" class="javazoom.upload.UploadBean" >

<%
Properties props = new Properties();
props.put("user","cepic");
props.put("passWord","lpsc");
upBean.setDatabasestore("oracle.jdbc.driver.OracleDriver","jdbc:oracle:thin:@10.231.234.252:1521:cepic",props); //数据库连接
%>

</jsp:useBean>
<head>
<title>中文上传</title>
<meta http-equiv="Content-Type" content="text/html; charset="gb2312">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<ul>
<%
request.setCharacterEncoding("gb2312");
if (MultipartFormDataRequest.isMultipartFormData(request))
{
// Uses MultipartFormDataRequest to parse the HTTP request.
MultipartFormDataRequest mrequest = new MultipartFormDataRequest(request,null,100*1024*1024,MultipartFormDataRequest.COSPARSER,"gb2312");
String todo = mrequest.getParameter("todo");
if ( (todo != null) && (todo.equalsIgnoreCase("upload")) )
{
Hashtable files = mrequest.getFiles();
if ( (files != null) (!files.isEmpty()) )
{
UploadFile file = (UploadFile) files.get("uploadfile");
out.println("<li>Form field(表格栏): uploadfile"+" Uploaded file(已上传的文件名称): "+file.getFileName()+" ("+file.getFileSize()+" bytes)"+" Content Type(文件类别)"+file.getContentType());
//out.println("<li>Form field: uploadfile"+" Uploaded file: "+file.getFileName()+" ("+file.getFileSize()+" bytes)"+" Content Type"+file.getContentType());
// Uses the bean now to store specified by jsp:setProperty at the top.
upBean.store(mrequest, "uploadfile");
}
else
{
out.println("<li>No uploaded files");
}
out.println(" gb2312 Text(简体) = "+mrequest.getParameter("gb2312txt"));
}
else out.println(" todo="+todo);
}
%>
</ul>
<form method="post" action="ChineseDatabaseUpload.jsp" name="upform" enctype="multipart/form-data">
<table width="60%" border="0" cellspacing="1" cellpadding="1" align="center">
<tr>
<td align="left">请选择上传文件:</td>
</tr>
<tr>
<td align="left">
<input type="file" name="uploadfile" size="50">
</td>
</tr>
<tr>
<td align="left">
gb2312 text:
<input type="text" name="gb2312txt" size="20">
</td>
</tr>
<tr>
<td align="left">
<input type="hidden" name="todo" value="upload">
<input type="submit" name="Submit" value="上传">
<input type="reset" name="Reset" value="取消">
</td>
</tr>
</table>
 
 
<table width="90%" border="0" cellspacing="1" cellpadding="0" align="center">
<tr>
<td bgcolor="#666666">
<table width="100%" border="0" cellspacing="1" cellpadding="0" align="center">
<tr>
<td bgcolor="#FFFFFF"> Needed
HTML tags :</td>
</tr>
<tr>
<td bgcolor="#FFFFFF"> <form
method="post"
action="ChineseUpload.jsp"
name="upload" enctype="multipart/form-data"></td>
</tr>
<tr>
<td bgcolor="#FFFFFF"> <input
type="file"
name="uploadfile"
size="50"></td>
</tr>
</table>
</td>
</tr>
</table>
 
 
 
 
 
 
</form>
</body>
</html>

该ORACLE的表结构，在该网站上找吧！很简单就三个子段而已。

文件下载：
文件名：jspsmartdownload.jsp
文件内容：
<meta http-equiv="Content-Type" content="application/msword; charset=gb2312"> //注重这里，假如你没有设置成“GB2312”结果你会明白的。
<%@ page language="java" import="java.sql.*,com.jspsmart.upload.*"%>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />
<%
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

Connection con = DriverManager.getConnection("jdbc:oracle:thin:@10.231.234.252:1521:cepic", "cepic", "lpsc");

Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM UPLOADS");

if (rs.next()){
mySmartUpload.initialize(pageContext);
mySmartUpload.downloadField(rs,"BINARYFILE","application/msword","");
//mySmartUpload.fieldToFile(rs,"BINARYFILE","c:/sample.DOC");
}
rs.close();
stmt.close();
con.close();
%>