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| package cn.guizimo.servlet;
import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random;
@WebServlet("/checkCode") public class CheckCode extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { int width = 100; int height = 50; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
Graphics g = image.getGraphics(); g.setColor(Color.PINK); g.fillRect(0, 0, width, height); g.setColor(Color.BLUE); g.drawRect(0, 0, width - 1, height - 1);
String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; Random ran = new Random(); StringBuilder sb = new StringBuilder(); for (int i = 1; i <= 4; i++) { int index = ran.nextInt(str.length()); char ch = str.charAt(index); sb.append(ch); g.drawString(ch+"",width/5*i,height/2); } String checkCode_session = sb.toString(); req.getSession().setAttribute("checkCode_session",checkCode_session);
g.setColor(Color.GREEN); for (int i = 0; i < 10; i++) { int x1 = ran.nextInt(width); int x2= ran.nextInt(width); int y1 = ran.nextInt(height); int y2 = ran.nextInt(height); g.drawLine(x1,y1,x2,y2); }
ImageIO.write(image, "jpg", resp.getOutputStream());
}
@Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doPost(req, resp); } }
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