applet从文件读取数据命令程序中出现的问题.


   我的applet是从磁盘中读取数据进入一个数组中,然后应用数组中的点进行画图显示到applet中间的.经过我调试,该程序可以在jbuilder7下面运行,并且可以在jbuilder7重的html文件中运行,但是用ie打开就时,程序只能执行到初始化阶段,也就是只能画出坐标,执行读入命令时ie中的执行就结束了.所以只能显示坐标.
   不知道applet读取文件的要求和路径是怎么设置的,请高手指点.以下时我的代码.
package untitled1;  import java.applet.*;
 import java.awt.*;
 import java.awt.geom.*;
 import java.lang.Number;
 import java.util.*;
 import java.io.*;
 import java.lang.Object.*;
 import java.awt.event.*;
 
 public class Applet1 extends Applet {
 private boolean isStandalone = false;
 public double shuJu[]=new double [4096];
   //Initialize the applet
   public void init() {
     try {
     }
     catch(Exception e) {
       e.printStackTrace();
     }
   }
   //Component initialization
   private void jbInit() throws Exception {
        this.setLayout(null);   }  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }  public String getAppletInfo() {
    return "Applet Information";
  }  public String[][] getParameterInfo() {
    return null;
  }void read(){
    shuJu=new double [4096];
     int shuJuCunChuZhiBiao=0;
 try{
  RandomAccessFile fileInput=new RandomAccessFile("shuJu.txt","rw");
   this.showStatus("  绘图开始执行");
 while ((fileInput.getFilePointer()<fileInput.length())&&
 (shuJuCunChuZhiBiao<shuJu.length)){
   int read2;
   int xunHuanZhiBiao;
   read2=fileInput.read();
 if(readInCheck(read2)){
    char ip[]=new char[30];
   xunHuanZhiBiao=0;
    while(readInCheck(read2))
 {
 ip[xunHuanZhiBiao]=(char)read2;
 xunHuanZhiBiao++;
 read2=fileInput.read();
 }
 String s=new String(ip);
 shuJu[shuJuCunChuZhiBiao]=Double.parseDouble(s);
 shuJuCunChuZhiBiao++;
 } }
 } catch(IOException  e){ }
 }
   /*检查输入是否合格*/
   boolean readInCheck(int number) {    if((number>='0'&&number<='9')||number=='+'||number=='-'||number=='.')
         return true;
           else
        return  false;
   }   public void paint(Graphics g){
   g.drawLine(30,5,30,200);
   g.drawLine(30,200,580,200);g.drawString("(um)",31,15);
   g.drawLine(25,200,30,200);g.drawString("-100",5,200);
   g.drawLine(25,180,30,180);g.drawString("-80",5,180);
   g.drawLine(25,160,30,160);g.drawString("-60",5,160);
   g.drawLine(25,140,30,140);g.drawString("-40",5,140);
   g.drawLine(25,120,30,120);g.drawString("-20",5,120);
   g.drawLine(25,100,30,100);g.drawString("0",10,100);
   g.drawLine(25,80,30,80);g.drawString("20",5,80);
   g.drawLine(25,60,30,60);g.drawString("40",5,60);
   g.drawLine(25,40,30,40);g.drawString("60",5,40);
   g.drawLine(25,20,30,20);g.drawString("80",5,20);
   g.drawLine(30,200,30,205);g.drawString("0",30,215);
   g.drawLine(94,200,94,205);g.drawString("128",90,215);
   g.drawLine(158,200,158,205);g.drawString("256",155,215);
   g.drawLine(222,200,222,205);g.drawString("384",218,215);
   g.drawLine(286,200,286,205);g.drawString("512",282,215);
   g.drawLine(350,200,350,205);g.drawString("640",346,215);
   g.drawLine(414,200,414,205);g.drawString("768",410,215);
   g.drawLine(478,200,478,205);g.drawString("896",474,215);
   g.drawLine(542,200,542,205);g.drawString("1024",538,215);
   Graphics2D g2D=(Graphics2D)g;
   drawHome(g2D);
      }
  public void drawHome(Graphics2D g2D){
  //read();
  g2D.setColor(Color.red);
  int i=0;
  int j=60;
  for(i=0;i<shuJu.length-1;i++)
   {    Line2D line=new Line2D.Double(j/2,(shuJu[i]+100),(j+1)/2,(shuJu[i+1]+100));
                g2D.draw(line);
                 j=j+1;
         }
 }}