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【Java】验证码

作者:flypie / 发布于2015/7/9/ 336

用servlet实现网站登陆时的验证码功能


	package servlet;
	
	import java.awt.Color;
	import java.awt.Graphics;
	import java.awt.image.BufferedImage;
	import java.io.IOException;
	import java.util.Random;
	
	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;
	
	/**
	* Servlet implementation class ImageServlet
	*/
	@WebServlet("/ImageServlet")
	public class ImageServlet extends HttpServlet {
	 private static final long serialVersionUID = 1L;
	
	 /**
	 * @see HttpServlet#HttpServlet()
	 */
	 public ImageServlet() {
	 super();
	 // TODO Auto-generated constructor stub
	 }
	
	 /**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	 // TODO Auto-generated method stub
	 BufferedImage bi=new BufferedImage(68, 22,BufferedImage.TYPE_INT_RGB);
	 Graphics g=bi.getGraphics();
	 Color c=new Color(200,150,255);
	 g.setColor(c);
	 g.fillRect(0, 0, 68, 22);
	
	 char[] ch="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
	 Random r=new Random();
	 int len=ch.length;
	 int index;
	 StringBuffer sb=new StringBuffer();
	 for(int i=0;i<4;i++)
	 {
	 index=r.nextInt(len);
	 g.setColor(new Color(r.nextInt(88),r.nextInt(188),r.nextInt(255)));
	 g.drawString(ch[index]+"",(i*15)+3, 18);
	 sb.append(ch[index]);
	 }
	 request.getSession().setAttribute("piccode", sb.toString());
	 ImageIO.write(bi, "JPG", response.getOutputStream());
	 }
	
	 /**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	 // TODO Auto-generated method stub
	 }
	
	}

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