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Reading from a Text File in an Applet

 
Mike Hebear
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Posts: 15
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I am making a scrollbar in Java for my High School Website, and i works fine... except for the fact that I need the lines to be read from a text file instead of through parameters for ease in updating the info in the scrollbar for less computer-inclined people. Below is the code for my scrollbar so far (its kinda long so you may not wanna read all of it, any example of reading code from a text file and putting it in a string array would be appreciated). Please Help!!! Thanks in Advance.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class scrollerOriginal extends Applet
implements Runnable { // Threaded application
int maxLines=100, // Added by a user
direction=0, // 0=up, 1=down
delay=100, // delay, controls scroll speed
spacing=12, // spacing, between lines
XPos=5, // XPos, indent
maxLine=0, // maxLine, # of Lines being sent
current, // current, initial position
height; // height, of the applet
String[] Line = new String[maxLines];// Lines, to be displayed, 12 max
Image offImage, bg; // Double buffering to eliminate
Graphics offGrfx; // frame flicker
Font outFont; // Output font (if passed)
boolean customFont = false; // Flag, is there a custom outFont?
Color background, fontColor;
Thread runner;
public void init() {
/**** Get attributes, if available ****/
String bgRed$ = getParameter("BGRED");
String bgGreen$ = getParameter("BGGREEN");
String bgBlue$ = getParameter("BGBLUE");
String fgRed$ = getParameter("FGRED");
String fgGreen$ = getParameter("FGGREEN");
String fgBlue$ = getParameter("FGBLUE");
String spacing$ = getParameter("SPACING");
String delay$ = getParameter("DELAY");
String XPos$ = getParameter("XPOS");
String maxLine$ = getParameter("MAXLINE");
String background$ = getParameter("BACKGROUND");
String fontName$ = getParameter("FONTNAME");
String fontSize$ = getParameter("FONTSIZE");
String direction$ = getParameter("DIRECTION");
/**** Data lines ****/
for (int x=0; x<maxLines; x++) {
Line[x] = getParameter("LINE" + Integer.toString(x+1));
}
/**** Setting Font ****/
if ((fontSize$ != null) && (fontName$ != null)) {
int size = Integer.parseInt(fontSize$);
outFont = new Font(fontName$, Font.PLAIN, size);
customFont = true;
}
/**** Find maxline ****/
for (int x=0; x<maxLines; x++) {
if (Line[x] == null) break;
maxLine++;
}
/**** Convert color values ****/
int Red=255;
if (bgRed$ != null)
Red = Integer.parseInt(bgRed$);
int Green=255;
if (bgGreen$ != null)
Green = Integer.parseInt(bgGreen$);
int Blue=255;
if (bgBlue$ != null)
Blue = Integer.parseInt(bgBlue$);
int fRed=0;
if (fgRed$ != null)
fRed = Integer.parseInt(fgRed$);
int fGreen=0;
if (fgGreen$ != null)
fGreen = Integer.parseInt(fgGreen$);
int fBlue=0;
if (fgBlue$ != null)
fBlue = Integer.parseInt(fgBlue$);
/**** Convert attribute values ****/
if (spacing$ != null)
spacing = Integer.parseInt(spacing$);
if (delay$ != null)
delay = Integer.parseInt(delay$);
if (XPos$ != null)
XPos = Integer.parseInt(XPos$);
height = size().height;
if (direction$ != null)
direction = Integer.parseInt(direction$);
if (background$ !=null)
bg = getImage(getDocumentBase(), background$);
/**** Set init index ****/
if (direction == 0) {
current = height;
}
else {
current = -(maxLine * spacing);
}
/**** Set foreground color ****/
fontColor = new Color(fRed, fGreen, fBlue);
/**** Set background color ****/
background = new Color(Red, Green, Blue);
setBackground(background);

/**** Init buffer ****/
offImage = createImage(size().width, size().height);
offGrfx = offImage.getGraphics();
}
public void paint(Graphics screen) {
/**** Clear prev image ****/
offGrfx.setColor(background);
offGrfx.fillRect(0,0,size().width, size().height);
/**** Draw background ****/
if (bg != null)
offGrfx.drawImage(bg, 0, current - height, null);
/**** Set custom font ****/
offGrfx.setColor(fontColor);
try { offGrfx.setFont(outFont); }
catch (NullPointerException e) {}
/**** Draw lines ****/
if (direction == 0) {
for (int i=0; i<maxLine; i++)
offGrfx.drawString(Line[i], XPos, current + (i * spacing));
}
else {
for (int i=0; i<maxLine; i++)
offGrfx.drawString(Line[i], XPos, current + ( (maxLine-i) * spacing));
}
/**** Flip buffer to screen ****/
screen.drawImage(offImage, 0, 0, this);
}
public void update(Graphics screen) {
/**** Override update ****/
paint(screen);
}
public void start() {
if (runner == null) {
runner = new Thread(this);
runner.start();
}
}
public void run() {
while (true) {
repaint();
if (direction == 0) {
current--;
if ((current + (maxLine * spacing)) < 0)
current = height + spacing;
}
else {
current++;
if (current > height)
current = -(maxLine * spacing);
}
try { Thread.sleep(delay); }
catch (InterruptedException e) { }
}
}
public void stop() {
if (runner != null) {
runner.stop();
runner = null;
}
}
}
 
Joe Ess
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Take a look at the Java Tutorial section on I/O: Reading and Writing.
 
Mindy Wu
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Posts: 121
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this is the exmaple i found on the web that might help you out.
http://www.particle.kth.se/~fmi/kurs/PhysicsSimulation/Lectures/12B/fileReadByApplet.html
 
Mike Hebear
Greenhorn
Posts: 15
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good example, thank you very much. I cant beleive i didnt find that!
 
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