JSP中的上传问题
在用户注册界面，要上传一个用户的头像，那么怎么才能做到这个上传后的路径和这个用户绑定呢？

[解决办法]
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception{
//ActionMessages mess=new ActionMessages();

String dir=servlet.getServletContext().getRealPath( "/upload ");
File scfile=new File(dir);
if(!scfile.exists()){
scfile.mkdir();
}
HtmlFileForm hff=(HtmlFileForm)form;
FormFile file=hff.getFile();
String flname=file.getFileName();
if(flname==null||flname.equals( " ")){
this.setFileErrorMessage( "sssss ");
request.setAttribute( "error1 ", this.fileErrorMessage);
return mapping.findForward( "failure ");
}

//ﾅﾐｶﾏﾎﾄｼ�ﾀﾍ
int imgType=flname.lastIndexOf( ". ");
String imgTypeStr=flname.substring(imgType);

//ｽｫﾎﾄｼ�ﾃ逸ｦﾀ昕ﾉｵｱﾌ�ﾈﾕﾆﾚ+ﾋｴﾊ�
String date=DNSUtility.getCurrentYeanMonthDay();
String[] dateStr=date.split( "/ ");
String dateName=dateStr[0]+dateStr[1]+dateStr[2];

Random random = new Random();
int rdInt=random.nextInt(1000000000);
String rdStr=String.valueOf(rdInt);

String fname=dateName+rdStr+imgTypeStr;
//ｱ｣ｴｽﾊ�ｾﾝｿ�

String urlTemp= "./upload/ ";
String picUrl=urlTemp+fname;
//ﾅﾐｶﾏﾎﾄｼ�ｴ｡
if(file.getFileSize()> 2097152){
this.setSizeErrorMessage( "ｶﾔｲｻﾆｬﾇ�ｲﾔﾄﾏｴｫｵﾄﾍｼﾆｬﾊﾇｷ�ﾈｷ(ﾎﾄｼ�ﾒﾑｾｭｳｬｹ�2M)! ");
request.setAttribute( "error2 ", this.sizeErrorMessage);
return mapping.findForward( "failure ");
}
//ﾅﾐｶﾏﾎﾄｼ�ﾀﾍ
//ｱ｣ｴ�.swfﾎﾄｼ�ｵｽflashｱ�

if(imgTypeStr.equals( ".swf ")){
String size=Integer.toString(file.getFileSize())+ "bytes ";
InputStream streamIn=file.getInputStream();
OutputStream streamOut=new FileOutputStream(dir+ "/ "+fname);
int bytesRead=0;
byte[] buffer=new byte[8192];
while((bytesRead=streamIn.read(buffer,0,8192))!=-1){
streamOut.write(buffer, 0, bytesRead);
}
streamOut.close();
streamIn.close();
hff.setFname(fname);
hff.setSize(size);
file.destroy();
this.pictureComponentsService.insertFlashUrl(picUrl);
return mapping.findForward( "success ");
}
if(!imgTypeStr.equals( ".jpg ")&&!imgTypeStr.equals( ".gif ")&&!imgTypeStr.equals( ".jpeg ")&&!imgTypeStr.equals( ".png ")&&!imgTypeStr.equals( ".swf ")){

this.setTypeErrorMessage( "ｶﾔｲｻﾆｬﾇ�ｲﾔﾄﾏｴｫｵﾄﾍｼﾆｬﾀﾍ! ");
request.setAttribute( "error3 ",this.typeErrorMessage);
return mapping.findForward( "failure ");
}

String size=Integer.toString(file.getFileSize())+ "bytes ";
InputStream streamIn=file.getInputStream();
OutputStream streamOut=new FileOutputStream(dir+ "/ "+fname);
int bytesRead=0;
byte[] buffer=new byte[8192];
while((bytesRead=streamIn.read(buffer,0,8192))!=-1){
streamOut.write(buffer, 0, bytesRead);
}
streamOut.close();
streamIn.close();
hff.setFname(fname);
hff.setSize(size);
file.destroy();
this.pictureComponentsService.insertPicUrl(picUrl);
return mapping.findForward( "success ");

}