struts流的上传

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( "请选择你要上传的图片 ");
request.setAttribute( "error1 ",   this.fileErrorMessage);
                  return   mapping.findForward( "failure ");
}

//判断文件类型
int   imgType=flname.lastIndexOf( ". ");
String   imgTypeStr=flname.substring(imgType);

//将文件名处理成当天日期+随即数
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;
//保存到数据库

String   urlTemp= "./upload/ ";
String   picUrl=urlTemp+fname;
//判断文件大小
if(file.getFileSize()> 2097152){
this.setSizeErrorMessage( "对不起，请查对您上传的图片是否正确(文件   已经超过2M)! ");
request.setAttribute( "error2 ",   this.sizeErrorMessage);
return   mapping.findForward( "failure ");
}
//判断文件类型
if(!imgTypeStr.equals( ".jpg ")&&!imgTypeStr.equals( ".gif ")&&!imgTypeStr.equals( ".jpeg ")&&!imgTypeStr.equals( ".png ")&&!imgTypeStr.equals( ".swf ")){
this.setTypeErrorMessage( "对不起，请查对您上传的图片类型! ");
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 ");

}