晚上好，各位麻烦辛苦帮忙看下这程序，感激不尽

下面是的 jsp  程序实现文件上传功能     遇到点问题  请各位麻烦帮小弟看看  谢谢了~~！！！servle-api.jar我已经复制到jdk安装目录中 jre\lib\ext出现的问题提示是-----“Access restriction: The type HttpServletRequest is not accessible due to restriction on required library D:\java\jdk-7\jre\lib\ext\servlet-api.jar”
以下是问题的程序
package user.file;import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.RandomAccessFile;
import javax.servlet.http.*;public class UpFile {
HttpServletRequest request;
HttpSession session;
String upUileMessage="";
public void setRequest(HttpServletRequest request){
this.request=request;
}
public void setSession(HttpSession session){
this.session=session;
}
public String getUpFileMessage(){
String fileName=null;
String upFileMessage;
try{
String tempFileName=(String)session.getId();
File f1=new File("d:/java",tempFileName);
FileOutputStream o=new FileOutputStream(f1);
InputStream in=request.getInputStream();
byte b[]=new byte[1000];
int n;
while((n=in.read(b))!=-1){
o.write(b,0,n);
}
o.close();
in.close();
RandomAccessFile random=new RandomAccesFile(f1,"r");
int second=1;
String secondLine=null;
while(second<=2){
secondLine=random.readLine();
second++;
int position=secondLine.lastIndexOf('\\');
fileName=secondLine.substring(position+1,secondLine.length()-1);
byte cc[]=fileName.getBytes("ISO-8859-1");
fileName=new String(cc);
session.setAttribute("Name",fileName);
random.seek(o);
long forthEndPosition=0;
int forth=1;
while((n=random.readByte())!=-1&&(forth<=4)){
if(n=='\n'){
forthEndPosition=random.getFilePointer();
forth++;
}
}
File f2=new File("d:/java",fileName);
RandomAccessFile random2=new RandomAccessFile(f2,"rw");
random.seek(random.length());
long endPosition=random.getFilePointer();
long =endPosition;
int j=1;
while((>=0)&&(j<=6)){
--;
random.seek();
n=random.readByte();
if(n=='\n'){
endPosition=random.getFilePointer();
j++;
}
}
random.seek(forthEndPosition);
long startPoint=random.getFilePointer();
while(startPoint<endPosition-1){
n=random.readByte();
random2.write(n);
startPoint=random.getFilePointer();
}
random2.close();
random.close();
f1.delete();
upFileMessage=fileName+"Successfully UpLoad";
return upFileMessage;
}
}
catch(Exception exp){
Object fileName1;
if((fileName!=null)){
upFileMessage=fileName+"Fail to UpLoad";
return upFileMessage;
}
else{
upFileMessage="";
return upFileMessage;
}
}
}
}