如果你曾用VB编写文件上传的组件的话
,那么用JAVA编写文件上传的JAVABEAN十分容易
。  
下面的例子只是一个简版
  
package yuanyifileup;
  
import java.io.*;
  
import java.util.*;
  
import javax.servlet.*;
  
import javax.servlet.http.*;
  
import javax.servlet.
jsp.PageContext;  
  
public class yuanyifileup
  
{
  
private ServletRequest request;
  
private ServletResponse response;
  
private ServletConfig config;
  
ServletInputStream DATA;
  
int FormSize;
  
File f1;
  
FileOutputStream os;
  
DataInputStream is;
  
String filename;
  
byte[] b;
  
byte t;
  
boolean flag=false;
  
public yuanyifileup()
  
{ }
  
public void initialize(ServletConfig config,HttpServletRequest request,HttpServletResponse response) throws IOException
  
{
  
this.request=request;
  
this.response=response;
  
this.config=config;
  
DATA = request.getInputStream();
  
FormSize=request.getContentLength();
  
}
  
public void initialize(PageContext pageContext) throws IOException
  
{
  
request=pageContext.getRequest();
  
response=pageContext.getResponse();
  
config=pageContext.getServletConfig();
  
DATA = request.getInputStream();
  
FormSize=request.getContentLength();
  
}
  
public boolean setFilename(String s)
  
{
  
try
  
{
  
File f1=new File(s);
  
os=new FileOutputStream(f1);
  
}
  
catch(IOException e)
  
{return(false);}
  
return(true);
  
}
  
public void getByte()
  
{
  
int i=0;
  
try
  
{
  
is=new DataInputStream(DATA);
  
b=new byte[FormSize];  
  
while (true)
  
{
  
try
  
{
  
t=is.readByte();
  
b[i]=t;
  
i++;
  
}
  
catch(EOFException e)
  
{ break;}
  
}
  
is.close();}
  
catch(IOException e)
  
{}
  
}  
  
public boolean save()
  
{
  
int i=0,start1=0,start2=0;
  
String temp="";
  
if (!flag)
  
{
  
getByte();
  
flag=true;
  
}
  
try
  
{
  
temp=new String(b,"ISO8859_1");
  
}
  
catch(UnsupportedEncodingException e)
  
{return(false);}  
  
start1=temp.indexOf("image/");
  
temp=temp.substring(start1);  
  
start1=temp.indexOf("
");  
  
temp=temp.substring(start1+4);
  
start2=temp.indexOf(";
");
  
if (start2!=-1)
  
{
  
temp=temp.substring(0,start2); 
  
}
  
try
  
{
  
byte[] img=temp.getBytes("ISO8859_1");
  
for (i=0;i<img.length;i++)
  
{ os.write(img[i]); }
  
os.close();
  
}
  
catch(IOException e)
  
{return(false);}  
  
return(true);  
  
}
  
如果有不明白的发E-Mail:yymailbox@263.net.Bye   
  
}