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Example code for generating random pictures in java

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Release: 2017-06-17 13:13:01
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This article mainly introduces the relevant information about java's implementation of outputting random pictures example code. Friends who need it can refer to

java implementation of outputting random pictures example code

Output random pictures (CAPTCHA images): Completely Automated Public Turing Test to Tell Computers and Humans Apart (fully automated test to distinguish computers and humans)

Related main categories (JDK View API)

BufferedImage:Memory image
Graphics:Brush
ImageIO:Output image

Place on the html page

Note: The browser will cache images by default


   public static int WIDTH = 120; 
public static int HEIGHT = 25; 
 
public void doGet(HttpServletRequest request, HttpServletResponse response) 
    throws ServletException, IOException { 
 
  response.setContentType("text/html"); 
  //创建内存图像 
  BufferedImage image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB); 
  //勾勒图像 
  Graphics graphics = image.getGraphics(); 
  //设置背景 
  graphics.setColor(Color.WHITE); 
  graphics.fillRect(0, 0, WIDTH, HEIGHT); 
  //设置边框 
  graphics.setColor(Color.BLUE); 
  graphics.drawRect(1, 1, WIDTH-2, HEIGHT-2); 
  //画干扰线 
  graphics.setColor(Color.YELLOW); 
  for(int i=0;i<8;i++){ 
    int xStart = new Random().nextInt(WIDTH); 
    int yStart = new Random().nextInt(HEIGHT); 
    int xEnd = new Random().nextInt(WIDTH); 
    int yEnd = new Random().nextInt(HEIGHT); 
    graphics.drawLine(xStart, yStart, xEnd, yEnd); 
  } 
  //写随机数 
  graphics.setColor(Color.RED); 
  int x = 5; 
  for(int i=0;i<4;i++){ 
    graphics.drawString(new Random().nextInt(9)+"", x, 20); 
    x+=30; 
  } 
  response.setContentType("image/jpeg");//设置响应格式 
  ImageIO.write(image, "jpeg", response.getOutputStream()); 
   
}
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