inserting java code made in processing

I made a code in processing thats java. I'm having problems finding any resources or tutorials on how to put it into my site. If its even possible. 

I go into "Pages" > "Page Settings" > "Advanced" inject code here. It doesn't work. The code itself just shows up on the page. Another thing is that this code basically uses the mouse to control an image. So the image needs to be uploaded as well. Could I put my Java code into CSS? Again this is Java, not JavaScript. 

Any help would be appreciated. See code below.

PImage img; 

void setup() {
  size(1440, 810);
  img = loadImage("test4.jpg");
  img.resize (1440, 810);
}

void draw() {
  background(#FCEAEA);
  fill(0);
  noStroke();
  float tiles = mouseX/2;
  float tileSize = width/tiles;
  translate(tileSize/2, tileSize/2);
  for (int x = 0; x < tiles; x++) {
    for (int y = 0; y < tiles; y++) {
      color c = img.get(int(x*tileSize), int(y*tileSize));
      float size = map(brightness(c), 255, 0, 0, 3);    
      ellipse(x*tileSize, y*tileSize, size, size);
    }
  }
}