Shulou(Shulou.com)06/03 Report--

Package com.sys.web.sesoion;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.http.HttpSession Public class CheckCodeServlet extends HttpServlet {public void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {BufferedImage image = new BufferedImage; Graphics g = image.getGraphics (); g.drawString (Token.getNum (), 1515); ImageIO.write (image, "JPG", response.getOutputStream ()); response.setHeader ("expires", "- 1") Response.setHeader ("cache-control", "no-cache"); / / there is no slow response.setHeader ("pragma", "no-cache");}} / / is used to generate random numbers class Token {public static String getNum () {Random r = new Random (); int num = r.nextInt (10000); return num + ";}}

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.