fileOutPutSream文件传送--出现的错误

 import java.io.*;
import java.util.*;
import PackageEx.Disk4;

public class DiskVector{
    public static void main(String argv[]){
        double sumVol = 0;
        Vector robotVector = readF.readData1("input2.data");       
        FileOutputStream outStream = new FileOutputStream("output8.data"); //这里出现错误
        PrintWriter writer = new PrintWriter(outStream);
       
        writer.println(" width   height  depth   volume  ");
        writer.println("-----------------------------------------------------------------");
        for(Iterator i= robotVector.iterator();i.hasNext();){
            Disk4 temp = (Disk4)i.next();
            System.out.println(temp.readVar());
            sumVol = sumVol + (double)temp.vol();
            }
        writer.println("-----------------------------------------------------------------");
        writer.print("volume 乞闭"+"/t/t/t/t/t");
        writer.print(sumVol/robotVector.size()+"    ");
        writer.println("/n");
        writer.close();
        }//end of main
    }//end of demo

class readF{
    public static Vector readData1(String filename){
        Vector v = new Vector();
        try{
            FileInputStream stream = new FileInputStream(filename);
            InputStreamReader reader = new InputStreamReader(stream);
            StreamTokenizer tokens = new StreamTokenizer(reader);
           
            FileOutputStream outStream = new FileOutputStream("output8.data");
                      
            PrintWriter writer = new PrintWriter(outStream);
           
            tokens.eolIsSignificant(true);
            while(tokens.nextToken()!=tokens.TT_EOF){
                String sf = new String();
                String robotName = (String)tokens.sval;
                tokens.nextToken();  int number = (int) tokens.nval;
                tokens.nextToken();  int width = (int) tokens.nval;
                tokens.nextToken();  int height = (int) tokens.nval;
                tokens.nextToken();  int depth = (int) tokens.nval;
                if(tokens.nextToken()==tokens.TT_EOL){}
                    else{ sf = (String)tokens.sval; tokens.nextToken();}
                Disk4 d = new Disk4(robotName, number, width, height, depth, sf);
                v.addElement(d);
                }//end of while
            }catch(Exception e){ System.out.println(e);
                System.out.println("。。。。"); }
        return v;
        }//end of readData1
    }//end of readF

 

 

请求帮忙解决！急