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 UploadBeanJAVA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="jav

azoom.upload.*,java.util.*" %

<%@ page errorPage="ExceptionHandler.jsp" %

<jsp:useBean id="upBean" scope="application" class="javazoom.upload.UploadBe

an"

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

</head

<body bgcolor="#FFFFFF" text="#000000"

<ul<font size="-1" face="Verdana, Arial, Helvetica, sans-serif"

request.setCharacterEncoding("gb2312");

if (MultipartFormDataRequest.isMultipartFormData(request))

{

// Uses MultipartFormDataRequest to parse the HTTP request.

MultipartFormDataRequest mrequest = new MultipartFormDataRequest(request,nul

l,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("<liForm field(表格栏): uploadfile"+"<BR Uploaded file(已上传的

文件名称): "+file.getFileName()+" ("+file.getFileSize()+" bytes)"+"<BR Cont

ent Type(文件类别)"+file.getContentType());

//out.println("<liForm field: uploadfile"+"<BR Uploaded file: "+file.getFi

leName()+" ("+file.getFileSize()+" bytes)"+"<BR Content Type"+file.getConte

ntType());

// Uses the bean now to store specified by jsp:setProperty at the top.

upBean.store(mrequest, "uploadfile");

}

else

{

out.println("<liNo uploaded files");

}

out.println("<BR gb2312 Text(简体) = "+mrequest.getParameter("gb2312txt"));

}

else out.println("<BR todo="+todo);

}

</font</ul

<form method="post" action="ChineseDatabaseUpload.jsp" name="upform" enctype

="multipart/form-data"

<table width="60%" border="0" cellspacing="1" cellpadding="1" align="cente

<tr

<td align="left"<font size="-1" face="Verdana, Arial, Helvetica, sans

-serif"<b请选择上传文件:</b</font</td

</tr

<tr

<td align="left"<font size="-1" face="Verdana, Arial, Helvetica, sans

-serif"

<input type="file" name="uploadfile" size="50"

</font</td

</tr

<tr

<td align="left"<font size="-1" face="Verdana, Arial, Helvetica, sans

-serif"

gb2312 text:

<input type="text" name="gb2312txt" size="20"

</font</td

</tr

<tr

<td align="left"<font size="-1" face="Verdana, Arial, Helvetica, sans

-serif"

<input type="hidden" name="todo" value="upload"

<input type="submit" name="Submit" value="上传"

<input type="reset" name="Reset" value="取消"

</font</td

</tr

</table

<br

<table width="90%" border="0" cellspacing="1" cellpadding="0" align="cente

<tr

<td bgcolor="#666666"

<table width="100%" border="0" cellspacing="1" cellpadding="0" align

="center"

<tr

<td bgcolor="#FFFFFF"<font size="-1" face="Verdana, Arial, Helv

etica, sans-serif"<b<font color="#0000FF" Needed

HTML tags :</font</b</font</td

</tr

<tr

<td bgcolor="#FFFFFF"<font size="-1" face="Verdana, Arial, Helv

etica, sans-serif" <<bform</b

<bmethod</b="<b<font color="#FF0000"post</font</b"

<baction</b="<b<font color="#FF0000"ChineseUpload.jsp</fon

t</b"

name="upload" <benctype</b="<b<font color="#FF0000"multipa

rt/form-data</font</b"</font</td

</tr

<tr

<td bgcolor="#FFFFFF"<font size="-1" face="Verdana, Arial, Helv

etica, sans-serif" <<binput</b

<btype</b="<b<font color="#FF0000"file</font</b"

<bname</b="<font color="#FF0000"<buploadfile</b</font"

size="50"</font</td

</tr

</table

</td

</tr

</table

<p </p

<p align="center" </p

</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：

//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.Smar

tUpload" /

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

Connection con = DriverManager.getConnection("jdbc:oracle:thin10.231.234.2

52:1521: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();